/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:03:53,318 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:03:53,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:03:53,348 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:03:53,390 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:03:53,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:03:53,391 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:03:53,392 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 12:03:53,404 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:03:53,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:03:53,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:03:53,406 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:03:53,406 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:03:53,406 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:03:53,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:03:53,407 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:03:53,407 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:03:53,407 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:03:53,407 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:03:53,407 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:03:53,407 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:03:53,408 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:03:53,408 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:03:53,408 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:03:53,408 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:03:53,408 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:03:53,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:03:53,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:03:53,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:03:53,409 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:03:53,409 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:03:53,409 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:03:53,652 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:03:53,667 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:03:53,669 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:03:53,669 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:03:53,670 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:03:53,671 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c [2021-05-06 12:03:53,720 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d016a7e3/c8ba97a01cab431a8adcda10eaf8f099/FLAGfe8f4e547 [2021-05-06 12:03:54,168 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:03:54,168 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c [2021-05-06 12:03:54,173 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d016a7e3/c8ba97a01cab431a8adcda10eaf8f099/FLAGfe8f4e547 [2021-05-06 12:03:54,182 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d016a7e3/c8ba97a01cab431a8adcda10eaf8f099 [2021-05-06 12:03:54,184 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:03:54,185 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:03:54,186 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:03:54,186 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:03:54,189 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:03:54,189 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,190 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48ee8510 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54, skipping insertion in model container [2021-05-06 12:03:54,190 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,194 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:03:54,202 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:03:54,278 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c[468,481] [2021-05-06 12:03:54,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:03:54,291 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:03:54,336 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c[468,481] [2021-05-06 12:03:54,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:03:54,358 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:03:54,358 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54 WrapperNode [2021-05-06 12:03:54,359 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:03:54,359 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:03:54,359 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:03:54,359 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:03:54,366 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,366 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,370 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,370 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,373 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,375 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,376 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... [2021-05-06 12:03:54,377 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:03:54,378 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:03:54,378 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:03:54,378 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:03:54,378 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:03:54,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:03:54,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:03:54,437 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:03:54,437 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:03:54,437 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:03:54,438 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:03:54,438 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:03:54,438 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:03:54,438 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:03:54,438 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:03:54,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:03:54,440 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:03:54,440 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:03:54,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:03:54,700 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:03:54,700 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 12:03:54,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:03:54 BoogieIcfgContainer [2021-05-06 12:03:54,701 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:03:54,702 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:03:54,702 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:03:54,704 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:03:54,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:03:54" (1/3) ... [2021-05-06 12:03:54,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ad6596d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:03:54, skipping insertion in model container [2021-05-06 12:03:54,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:03:54" (2/3) ... [2021-05-06 12:03:54,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ad6596d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:03:54, skipping insertion in model container [2021-05-06 12:03:54,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:03:54" (3/3) ... [2021-05-06 12:03:54,708 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_notd2.c [2021-05-06 12:03:54,711 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:03:54,713 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:03:54,725 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:03:54,740 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:03:54,740 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:03:54,740 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:03:54,740 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:03:54,740 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:03:54,740 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:03:54,740 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:03:54,740 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:03:54,754 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 12:03:54,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 12:03:54,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:54,759 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:54,760 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:54,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:54,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1039138334, now seen corresponding path program 1 times [2021-05-06 12:03:54,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:54,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096881581] [2021-05-06 12:03:54,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:54,809 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:03:54,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:54,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:54,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:54,980 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:54,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096881581] [2021-05-06 12:03:54,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2096881581] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:54,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:54,982 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:03:54,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424490493] [2021-05-06 12:03:54,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:03:54,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:54,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:03:54,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:03:54,997 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:55,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:55,086 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2021-05-06 12:03:55,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:03:55,088 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-06 12:03:55,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:55,092 INFO L225 Difference]: With dead ends: 50 [2021-05-06 12:03:55,092 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 12:03:55,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:03:55,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 12:03:55,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 12:03:55,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:55,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-06 12:03:55,134 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2021-05-06 12:03:55,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:55,134 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-06 12:03:55,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:55,135 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-06 12:03:55,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 12:03:55,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:55,135 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:55,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:03:55,136 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:55,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:55,138 INFO L82 PathProgramCache]: Analyzing trace with hash 677978447, now seen corresponding path program 1 times [2021-05-06 12:03:55,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:55,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390027972] [2021-05-06 12:03:55,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:55,143 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:03:55,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:55,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:55,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:55,273 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:55,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390027972] [2021-05-06 12:03:55,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [390027972] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:55,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:55,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 12:03:55,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345692685] [2021-05-06 12:03:55,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 12:03:55,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:55,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 12:03:55,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:03:55,275 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:55,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:55,409 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-05-06 12:03:55,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 12:03:55,409 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-06 12:03:55,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:55,410 INFO L225 Difference]: With dead ends: 46 [2021-05-06 12:03:55,410 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 12:03:55,411 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 89.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:03:55,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 12:03:55,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-06 12:03:55,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:55,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-06 12:03:55,429 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2021-05-06 12:03:55,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:55,429 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-06 12:03:55,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:55,429 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-06 12:03:55,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 12:03:55,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:55,430 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:55,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:03:55,430 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:55,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:55,430 INFO L82 PathProgramCache]: Analyzing trace with hash -673447056, now seen corresponding path program 1 times [2021-05-06 12:03:55,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:55,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607384769] [2021-05-06 12:03:55,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:55,467 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:55,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:55,527 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:55,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:55,555 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:55,558 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:55,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:55,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:55,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:55,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:55,661 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:55,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607384769] [2021-05-06 12:03:55,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1607384769] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:55,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:55,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:03:55,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003797308] [2021-05-06 12:03:55,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:03:55,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:55,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:03:55,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:03:55,667 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:55,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:55,809 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2021-05-06 12:03:55,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 12:03:55,810 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-05-06 12:03:55,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:55,811 INFO L225 Difference]: With dead ends: 59 [2021-05-06 12:03:55,811 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 12:03:55,812 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 56.1ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-06 12:03:55,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 12:03:55,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2021-05-06 12:03:55,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 28 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:55,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-05-06 12:03:55,819 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 24 [2021-05-06 12:03:55,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:55,819 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-05-06 12:03:55,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:55,820 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-05-06 12:03:55,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 12:03:55,820 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:55,820 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:55,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 12:03:55,820 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:55,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:55,821 INFO L82 PathProgramCache]: Analyzing trace with hash 708533296, now seen corresponding path program 1 times [2021-05-06 12:03:55,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:55,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110959877] [2021-05-06 12:03:55,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:55,828 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:55,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,843 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:55,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:55,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:55,873 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:55,884 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:55,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:55,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:55,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:55,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:55,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:55,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:56,001 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:56,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110959877] [2021-05-06 12:03:56,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [110959877] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:56,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:56,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:03:56,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575398742] [2021-05-06 12:03:56,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:03:56,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:56,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:03:56,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:03:56,003 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:56,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:56,125 INFO L93 Difference]: Finished difference Result 64 states and 85 transitions. [2021-05-06 12:03:56,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 12:03:56,125 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-05-06 12:03:56,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:56,127 INFO L225 Difference]: With dead ends: 64 [2021-05-06 12:03:56,127 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 12:03:56,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 77.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 12:03:56,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 12:03:56,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2021-05-06 12:03:56,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:03:56,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-06 12:03:56,140 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 24 [2021-05-06 12:03:56,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:56,140 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-06 12:03:56,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 12:03:56,141 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-06 12:03:56,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:56,142 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:56,142 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:56,142 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 12:03:56,143 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:56,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:56,143 INFO L82 PathProgramCache]: Analyzing trace with hash -2061972965, now seen corresponding path program 1 times [2021-05-06 12:03:56,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:56,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448592667] [2021-05-06 12:03:56,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:56,159 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:56,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,186 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:56,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:56,217 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:56,230 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,231 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:56,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:56,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:56,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:56,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:56,340 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:56,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448592667] [2021-05-06 12:03:56,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [448592667] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:56,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:56,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:03:56,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081185996] [2021-05-06 12:03:56,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:03:56,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:56,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:03:56,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:03:56,342 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:56,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:56,542 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2021-05-06 12:03:56,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 12:03:56,543 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:56,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:56,544 INFO L225 Difference]: With dead ends: 77 [2021-05-06 12:03:56,544 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 12:03:56,544 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 164.0ms TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:03:56,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 12:03:56,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2021-05-06 12:03:56,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 12:03:56,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2021-05-06 12:03:56,557 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 25 [2021-05-06 12:03:56,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:56,558 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2021-05-06 12:03:56,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:56,558 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2021-05-06 12:03:56,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:56,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:56,559 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:56,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 12:03:56,559 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:56,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:56,560 INFO L82 PathProgramCache]: Analyzing trace with hash -2060125923, now seen corresponding path program 1 times [2021-05-06 12:03:56,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:56,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093655020] [2021-05-06 12:03:56,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:56,566 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:56,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:56,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:56,602 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:56,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:56,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:56,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:56,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:56,767 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:56,916 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:56,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093655020] [2021-05-06 12:03:56,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2093655020] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:56,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:56,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 12:03:56,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023064689] [2021-05-06 12:03:56,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 12:03:56,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:56,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 12:03:56,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-06 12:03:56,917 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:57,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:57,337 INFO L93 Difference]: Finished difference Result 114 states and 146 transitions. [2021-05-06 12:03:57,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:03:57,338 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:57,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:57,341 INFO L225 Difference]: With dead ends: 114 [2021-05-06 12:03:57,341 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 12:03:57,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 422.4ms TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:03:57,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 12:03:57,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 65. [2021-05-06 12:03:57,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 55 states have internal predecessors, (68), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 12:03:57,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 79 transitions. [2021-05-06 12:03:57,351 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 79 transitions. Word has length 25 [2021-05-06 12:03:57,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:57,351 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 79 transitions. [2021-05-06 12:03:57,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:57,351 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 79 transitions. [2021-05-06 12:03:57,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:57,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:57,352 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:57,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 12:03:57,352 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:57,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:57,352 INFO L82 PathProgramCache]: Analyzing trace with hash 2067453981, now seen corresponding path program 1 times [2021-05-06 12:03:57,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:57,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405192034] [2021-05-06 12:03:57,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:57,357 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:57,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:57,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:57,404 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:57,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:57,430 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:57,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:57,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:57,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:57,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:57,544 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:57,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405192034] [2021-05-06 12:03:57,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1405192034] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:57,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:57,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:03:57,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885194523] [2021-05-06 12:03:57,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:03:57,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:57,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:03:57,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:03:57,546 INFO L87 Difference]: Start difference. First operand 65 states and 79 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:57,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:57,710 INFO L93 Difference]: Finished difference Result 108 states and 137 transitions. [2021-05-06 12:03:57,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 12:03:57,710 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:57,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:57,712 INFO L225 Difference]: With dead ends: 108 [2021-05-06 12:03:57,712 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 12:03:57,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 82.0ms TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-05-06 12:03:57,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 12:03:57,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 81. [2021-05-06 12:03:57,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 70 states have internal predecessors, (88), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 12:03:57,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 101 transitions. [2021-05-06 12:03:57,721 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 101 transitions. Word has length 25 [2021-05-06 12:03:57,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:57,722 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 101 transitions. [2021-05-06 12:03:57,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:57,722 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 101 transitions. [2021-05-06 12:03:57,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:03:57,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:57,722 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:57,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 12:03:57,723 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:57,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:57,723 INFO L82 PathProgramCache]: Analyzing trace with hash 2069301023, now seen corresponding path program 1 times [2021-05-06 12:03:57,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:57,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11434266] [2021-05-06 12:03:57,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:57,727 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:57,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:57,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:57,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:57,765 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:57,774 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:57,775 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:03:57,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:57,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:57,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:57,998 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:57,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11434266] [2021-05-06 12:03:57,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [11434266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:57,998 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:57,998 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:03:57,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978876701] [2021-05-06 12:03:57,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:03:57,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:57,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:03:57,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:03:57,999 INFO L87 Difference]: Start difference. First operand 81 states and 101 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:58,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:58,407 INFO L93 Difference]: Finished difference Result 106 states and 132 transitions. [2021-05-06 12:03:58,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:03:58,407 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-06 12:03:58,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:58,408 INFO L225 Difference]: With dead ends: 106 [2021-05-06 12:03:58,408 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 12:03:58,409 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 359.7ms TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:03:58,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 12:03:58,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 95. [2021-05-06 12:03:58,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 80 states have (on average 1.275) internal successors, (102), 83 states have internal predecessors, (102), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:58,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 119 transitions. [2021-05-06 12:03:58,419 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 119 transitions. Word has length 25 [2021-05-06 12:03:58,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:58,419 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 119 transitions. [2021-05-06 12:03:58,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:58,419 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 119 transitions. [2021-05-06 12:03:58,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 12:03:58,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:58,420 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:58,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 12:03:58,420 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:58,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:58,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1643345404, now seen corresponding path program 1 times [2021-05-06 12:03:58,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:58,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347987064] [2021-05-06 12:03:58,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:58,428 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:58,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,439 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:58,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:58,460 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:58,479 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,485 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:58,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:58,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:58,533 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:58,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,546 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:58,549 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:58,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,557 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:58,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:58,574 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:58,600 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:58,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:58,613 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:58,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:58,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:58,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:58,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:58,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:58,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:58,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:58,948 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:58,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347987064] [2021-05-06 12:03:58,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [347987064] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:58,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:58,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 12:03:58,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41803498] [2021-05-06 12:03:58,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 12:03:58,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:58,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 12:03:58,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:03:58,949 INFO L87 Difference]: Start difference. First operand 95 states and 119 transitions. Second operand has 16 states, 16 states have (on average 1.375) internal successors, (22), 14 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:59,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:59,163 INFO L93 Difference]: Finished difference Result 172 states and 221 transitions. [2021-05-06 12:03:59,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 12:03:59,164 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 14 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-05-06 12:03:59,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:59,165 INFO L225 Difference]: With dead ends: 172 [2021-05-06 12:03:59,165 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 12:03:59,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 282.5ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:03:59,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 12:03:59,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 100. [2021-05-06 12:03:59,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 85 states have (on average 1.2705882352941176) internal successors, (108), 88 states have internal predecessors, (108), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:03:59,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 125 transitions. [2021-05-06 12:03:59,183 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 125 transitions. Word has length 28 [2021-05-06 12:03:59,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:59,183 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 125 transitions. [2021-05-06 12:03:59,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 14 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:59,183 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 125 transitions. [2021-05-06 12:03:59,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 12:03:59,188 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:59,188 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:59,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 12:03:59,189 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:59,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:59,189 INFO L82 PathProgramCache]: Analyzing trace with hash -646101633, now seen corresponding path program 2 times [2021-05-06 12:03:59,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:59,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313766676] [2021-05-06 12:03:59,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:59,204 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:03:59,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:59,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:59,252 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:03:59,271 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,277 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:03:59,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:59,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:59,315 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:03:59,325 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,326 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:59,336 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:03:59,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:59,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:59,375 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:03:59,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,391 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:03:59,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:03:59,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:03:59,424 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:03:59,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,435 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:59,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:59,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:03:59,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:59,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:59,823 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:59,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313766676] [2021-05-06 12:03:59,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [313766676] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:59,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:59,823 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:03:59,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717585178] [2021-05-06 12:03:59,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:03:59,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:59,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:03:59,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:03:59,824 INFO L87 Difference]: Start difference. First operand 100 states and 125 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:00,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:00,057 INFO L93 Difference]: Finished difference Result 164 states and 210 transitions. [2021-05-06 12:04:00,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 12:04:00,058 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-05-06 12:04:00,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:00,059 INFO L225 Difference]: With dead ends: 164 [2021-05-06 12:04:00,059 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 12:04:00,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 327.5ms TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:00,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 12:04:00,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 103. [2021-05-06 12:04:00,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 88 states have (on average 1.2613636363636365) internal successors, (111), 91 states have internal predecessors, (111), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:00,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 128 transitions. [2021-05-06 12:04:00,067 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 128 transitions. Word has length 31 [2021-05-06 12:04:00,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:00,067 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 128 transitions. [2021-05-06 12:04:00,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:00,067 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 128 transitions. [2021-05-06 12:04:00,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 12:04:00,067 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:00,068 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:00,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 12:04:00,068 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:00,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:00,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1657218883, now seen corresponding path program 3 times [2021-05-06 12:04:00,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:00,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660032959] [2021-05-06 12:04:00,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:00,075 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:00,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,106 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:00,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,122 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:00,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,133 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,155 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:00,164 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,165 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:00,171 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:00,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,199 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:00,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:00,210 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:00,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,222 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:00,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:00,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:00,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:00,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:00,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:00,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:00,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660032959] [2021-05-06 12:04:00,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [660032959] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:00,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:00,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:04:00,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288338643] [2021-05-06 12:04:00,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:04:00,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:00,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:04:00,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:04:00,589 INFO L87 Difference]: Start difference. First operand 103 states and 128 transitions. Second operand has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:00,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:00,914 INFO L93 Difference]: Finished difference Result 180 states and 230 transitions. [2021-05-06 12:04:00,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:04:00,914 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-05-06 12:04:00,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:00,915 INFO L225 Difference]: With dead ends: 180 [2021-05-06 12:04:00,915 INFO L226 Difference]: Without dead ends: 115 [2021-05-06 12:04:00,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 313.0ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:00,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-06 12:04:00,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 106. [2021-05-06 12:04:00,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 91 states have (on average 1.2637362637362637) internal successors, (115), 94 states have internal predecessors, (115), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:00,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 132 transitions. [2021-05-06 12:04:00,924 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 132 transitions. Word has length 31 [2021-05-06 12:04:00,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:00,924 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 132 transitions. [2021-05-06 12:04:00,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:00,924 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 132 transitions. [2021-05-06 12:04:00,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 12:04:00,924 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:00,925 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:00,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 12:04:00,925 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:00,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:00,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1482120420, now seen corresponding path program 4 times [2021-05-06 12:04:00,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:00,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515066624] [2021-05-06 12:04:00,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:00,933 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:00,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,935 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,944 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:00,963 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:00,975 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:00,978 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:00,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:00,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:00,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:01,010 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:01,020 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,021 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:01,024 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:01,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:01,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:01,054 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:01,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,071 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:01,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:01,088 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:01,102 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:01,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,113 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:01,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:01,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:01,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:01,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:01,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:01,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:01,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:01,561 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:01,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515066624] [2021-05-06 12:04:01,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [515066624] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:01,562 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:01,562 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:04:01,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347853027] [2021-05-06 12:04:01,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:04:01,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:01,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:04:01,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:04:01,563 INFO L87 Difference]: Start difference. First operand 106 states and 132 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:01,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:01,930 INFO L93 Difference]: Finished difference Result 171 states and 218 transitions. [2021-05-06 12:04:01,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:04:01,931 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2021-05-06 12:04:01,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:01,931 INFO L225 Difference]: With dead ends: 171 [2021-05-06 12:04:01,932 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 12:04:01,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 416.6ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:01,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 12:04:01,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 109. [2021-05-06 12:04:01,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 94 states have (on average 1.2553191489361701) internal successors, (118), 97 states have internal predecessors, (118), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:01,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 135 transitions. [2021-05-06 12:04:01,940 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 135 transitions. Word has length 34 [2021-05-06 12:04:01,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:01,940 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 135 transitions. [2021-05-06 12:04:01,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:01,940 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 135 transitions. [2021-05-06 12:04:01,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 12:04:01,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:01,941 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:01,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 12:04:01,941 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:01,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:01,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1224498974, now seen corresponding path program 5 times [2021-05-06 12:04:01,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:01,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670969684] [2021-05-06 12:04:01,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:01,948 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:01,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:01,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:01,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:01,977 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:01,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:01,996 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:02,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,028 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:02,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,040 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,042 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:02,054 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:02,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:02,074 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:02,086 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,089 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:02,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:02,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:02,120 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:02,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:02,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:02,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:02,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:02,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:02,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:02,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:02,555 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:02,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670969684] [2021-05-06 12:04:02,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1670969684] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:02,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:02,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:02,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232217717] [2021-05-06 12:04:02,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:02,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:02,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:02,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:02,556 INFO L87 Difference]: Start difference. First operand 109 states and 135 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:02,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:02,800 INFO L93 Difference]: Finished difference Result 175 states and 222 transitions. [2021-05-06 12:04:02,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:04:02,800 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2021-05-06 12:04:02,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:02,801 INFO L225 Difference]: With dead ends: 175 [2021-05-06 12:04:02,801 INFO L226 Difference]: Without dead ends: 121 [2021-05-06 12:04:02,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 380.5ms TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:02,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-06 12:04:02,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 109. [2021-05-06 12:04:02,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 94 states have (on average 1.2553191489361701) internal successors, (118), 97 states have internal predecessors, (118), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:02,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 135 transitions. [2021-05-06 12:04:02,809 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 135 transitions. Word has length 34 [2021-05-06 12:04:02,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:02,809 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 135 transitions. [2021-05-06 12:04:02,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:02,809 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 135 transitions. [2021-05-06 12:04:02,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 12:04:02,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:02,810 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:02,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 12:04:02,810 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:02,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:02,810 INFO L82 PathProgramCache]: Analyzing trace with hash 213381724, now seen corresponding path program 6 times [2021-05-06 12:04:02,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:02,811 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748695061] [2021-05-06 12:04:02,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:02,818 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:02,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,847 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:02,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,862 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:02,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,873 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,897 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:02,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,909 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,911 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:02,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:02,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:02,944 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:02,955 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,956 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:03,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:03,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:03,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:03,343 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:03,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748695061] [2021-05-06 12:04:03,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1748695061] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:03,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:03,343 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:03,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156100157] [2021-05-06 12:04:03,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:03,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:03,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:03,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:03,344 INFO L87 Difference]: Start difference. First operand 109 states and 135 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 18 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:03,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:03,690 INFO L93 Difference]: Finished difference Result 186 states and 237 transitions. [2021-05-06 12:04:03,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:04:03,690 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 18 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2021-05-06 12:04:03,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:03,691 INFO L225 Difference]: With dead ends: 186 [2021-05-06 12:04:03,692 INFO L226 Difference]: Without dead ends: 121 [2021-05-06 12:04:03,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 365.2ms TimeCoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:03,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-06 12:04:03,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 112. [2021-05-06 12:04:03,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 97 states have (on average 1.2577319587628866) internal successors, (122), 100 states have internal predecessors, (122), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:03,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 139 transitions. [2021-05-06 12:04:03,700 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 139 transitions. Word has length 34 [2021-05-06 12:04:03,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:03,700 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 139 transitions. [2021-05-06 12:04:03,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 18 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:03,700 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 139 transitions. [2021-05-06 12:04:03,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:04:03,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:03,701 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:03,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 12:04:03,701 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:03,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:03,701 INFO L82 PathProgramCache]: Analyzing trace with hash -802454433, now seen corresponding path program 7 times [2021-05-06 12:04:03,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:03,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771326693] [2021-05-06 12:04:03,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:03,709 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:03,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:03,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:03,736 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:03,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,750 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:03,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:03,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:03,778 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:03,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,787 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:03,793 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:03,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:03,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:03,825 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:03,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,842 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:03,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:03,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:03,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:03,886 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:03,896 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:03,911 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:03,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:04,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:04,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:04,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:04,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:04,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:04,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:04,337 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:04,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771326693] [2021-05-06 12:04:04,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1771326693] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:04,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:04,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:04,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627442166] [2021-05-06 12:04:04,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:04,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:04,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:04,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:04,338 INFO L87 Difference]: Start difference. First operand 112 states and 139 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:04,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:04,693 INFO L93 Difference]: Finished difference Result 180 states and 228 transitions. [2021-05-06 12:04:04,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:04:04,693 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:04:04,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:04,694 INFO L225 Difference]: With dead ends: 180 [2021-05-06 12:04:04,694 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 12:04:04,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 7 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 412.4ms TimeCoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:04,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 12:04:04,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 115. [2021-05-06 12:04:04,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 100 states have (on average 1.25) internal successors, (125), 103 states have internal predecessors, (125), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:04,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 142 transitions. [2021-05-06 12:04:04,707 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 142 transitions. Word has length 37 [2021-05-06 12:04:04,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:04,707 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 142 transitions. [2021-05-06 12:04:04,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:04,707 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 142 transitions. [2021-05-06 12:04:04,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:04:04,707 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:04,707 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:04,707 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 12:04:04,707 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:04,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:04,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1620102883, now seen corresponding path program 8 times [2021-05-06 12:04:04,708 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:04,708 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [961864090] [2021-05-06 12:04:04,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:04,719 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:04,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:04,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:04,760 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:04,773 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,778 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:04,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:04,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:04,814 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:04,825 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,827 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:04,831 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:04,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,843 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:04,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:04,865 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:04,877 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,881 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:04,890 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:04,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:04,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:04,913 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:04,923 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:04,924 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:04,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:05,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:05,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:05,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:05,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:05,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:05,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:05,384 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:05,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [961864090] [2021-05-06 12:04:05,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [961864090] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:05,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:05,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:05,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052840536] [2021-05-06 12:04:05,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:05,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:05,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:05,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:05,385 INFO L87 Difference]: Start difference. First operand 115 states and 142 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:05,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:05,689 INFO L93 Difference]: Finished difference Result 183 states and 231 transitions. [2021-05-06 12:04:05,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:04:05,689 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:04:05,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:05,690 INFO L225 Difference]: With dead ends: 183 [2021-05-06 12:04:05,690 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 12:04:05,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 425.4ms TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:05,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 12:04:05,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 115. [2021-05-06 12:04:05,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 100 states have (on average 1.25) internal successors, (125), 103 states have internal predecessors, (125), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:05,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 142 transitions. [2021-05-06 12:04:05,702 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 142 transitions. Word has length 37 [2021-05-06 12:04:05,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:05,703 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 142 transitions. [2021-05-06 12:04:05,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:05,703 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 142 transitions. [2021-05-06 12:04:05,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:04:05,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:05,704 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:05,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 12:04:05,704 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:05,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:05,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1086516511, now seen corresponding path program 9 times [2021-05-06 12:04:05,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:05,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210910722] [2021-05-06 12:04:05,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:05,712 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:05,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:05,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:05,756 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:05,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,771 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:05,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:05,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:05,801 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:05,811 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,813 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:05,827 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:05,828 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:05,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:05,854 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:05,865 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,872 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:05,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:05,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:05,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:05,903 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:05,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:05,914 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:05,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:06,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:06,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:06,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:06,346 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:06,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210910722] [2021-05-06 12:04:06,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1210910722] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:06,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:06,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:06,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427033494] [2021-05-06 12:04:06,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:06,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:06,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:06,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:06,348 INFO L87 Difference]: Start difference. First operand 115 states and 142 transitions. Second operand has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:06,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:06,785 INFO L93 Difference]: Finished difference Result 181 states and 229 transitions. [2021-05-06 12:04:06,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:04:06,795 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:04:06,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:06,795 INFO L225 Difference]: With dead ends: 181 [2021-05-06 12:04:06,796 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 12:04:06,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 408.9ms TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:06,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 12:04:06,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2021-05-06 12:04:06,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 100 states have (on average 1.25) internal successors, (125), 103 states have internal predecessors, (125), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:06,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 142 transitions. [2021-05-06 12:04:06,822 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 142 transitions. Word has length 37 [2021-05-06 12:04:06,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:06,822 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 142 transitions. [2021-05-06 12:04:06,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:06,822 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 142 transitions. [2021-05-06 12:04:06,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:04:06,822 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:06,822 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:06,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 12:04:06,823 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:06,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:06,823 INFO L82 PathProgramCache]: Analyzing trace with hash 75399261, now seen corresponding path program 10 times [2021-05-06 12:04:06,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:06,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270771293] [2021-05-06 12:04:06,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:06,829 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:06,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,871 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:06,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,886 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:06,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,888 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,917 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:06,926 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,927 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,933 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:06,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,945 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:06,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:06,968 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:06,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,981 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:07,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:07,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:07,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:07,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:07,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:07,454 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:07,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270771293] [2021-05-06 12:04:07,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1270771293] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:07,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:07,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:07,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762987317] [2021-05-06 12:04:07,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:07,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:07,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:07,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:07,455 INFO L87 Difference]: Start difference. First operand 115 states and 142 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:07,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:07,738 INFO L93 Difference]: Finished difference Result 192 states and 244 transitions. [2021-05-06 12:04:07,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:07,741 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2021-05-06 12:04:07,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:07,743 INFO L225 Difference]: With dead ends: 192 [2021-05-06 12:04:07,743 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 12:04:07,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 429.8ms TimeCoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:07,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 12:04:07,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 118. [2021-05-06 12:04:07,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 103 states have (on average 1.2524271844660195) internal successors, (129), 106 states have internal predecessors, (129), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:07,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 146 transitions. [2021-05-06 12:04:07,752 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 146 transitions. Word has length 37 [2021-05-06 12:04:07,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:07,752 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 146 transitions. [2021-05-06 12:04:07,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:07,753 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 146 transitions. [2021-05-06 12:04:07,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 12:04:07,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:07,753 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:07,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 12:04:07,753 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:07,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:07,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1742968907, now seen corresponding path program 1 times [2021-05-06 12:04:07,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:07,754 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63477777] [2021-05-06 12:04:07,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:07,768 WARN L240 tifierPushTermWalker]: treesize reduction 72, result has 55.0 percent of original size [2021-05-06 12:04:07,826 WARN L245 tifierPushTermWalker]: treesize reduction 72, result has 55.0 percent of original size 88 [2021-05-06 12:04:07,857 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:07,882 WARN L240 tifierPushTermWalker]: treesize reduction 62, result has 58.7 percent of original size [2021-05-06 12:04:07,929 WARN L245 tifierPushTermWalker]: treesize reduction 62, result has 58.7 percent of original size 88 [2021-05-06 12:04:07,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:07,963 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:07,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:08,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:08,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:08,065 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:08,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63477777] [2021-05-06 12:04:08,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [63477777] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:08,065 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:08,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:04:08,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129787835] [2021-05-06 12:04:08,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:04:08,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:08,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:04:08,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:04:08,066 INFO L87 Difference]: Start difference. First operand 118 states and 146 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:08,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:08,202 INFO L93 Difference]: Finished difference Result 215 states and 274 transitions. [2021-05-06 12:04:08,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 12:04:08,203 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-06 12:04:08,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:08,204 INFO L225 Difference]: With dead ends: 215 [2021-05-06 12:04:08,204 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 12:04:08,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 74.2ms TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:04:08,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 12:04:08,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 133. [2021-05-06 12:04:08,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 118 states have (on average 1.2457627118644068) internal successors, (147), 121 states have internal predecessors, (147), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:08,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 164 transitions. [2021-05-06 12:04:08,218 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 164 transitions. Word has length 39 [2021-05-06 12:04:08,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:08,218 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 164 transitions. [2021-05-06 12:04:08,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:08,218 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 164 transitions. [2021-05-06 12:04:08,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:04:08,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:08,218 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:08,219 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 12:04:08,219 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:08,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:08,219 INFO L82 PathProgramCache]: Analyzing trace with hash 651130940, now seen corresponding path program 11 times [2021-05-06 12:04:08,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:08,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1950689323] [2021-05-06 12:04:08,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:08,230 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:08,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:08,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:08,266 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:08,277 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,282 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:08,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:08,311 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:08,327 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:08,337 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,338 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:08,340 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:08,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:08,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:08,370 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:08,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,386 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:08,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:08,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:08,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:08,420 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:08,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:08,430 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:08,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:08,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:08,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:08,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:08,930 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:08,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1950689323] [2021-05-06 12:04:08,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1950689323] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:08,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:08,931 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:04:08,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659146465] [2021-05-06 12:04:08,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:04:08,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:08,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:04:08,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:04:08,932 INFO L87 Difference]: Start difference. First operand 133 states and 164 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:09,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:09,266 INFO L93 Difference]: Finished difference Result 221 states and 276 transitions. [2021-05-06 12:04:09,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:04:09,266 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:04:09,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:09,267 INFO L225 Difference]: With dead ends: 221 [2021-05-06 12:04:09,267 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 12:04:09,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 7 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 476.2ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:09,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 12:04:09,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 136. [2021-05-06 12:04:09,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 121 states have (on average 1.2396694214876034) internal successors, (150), 124 states have internal predecessors, (150), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:09,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 167 transitions. [2021-05-06 12:04:09,280 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 167 transitions. Word has length 40 [2021-05-06 12:04:09,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:09,280 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 167 transitions. [2021-05-06 12:04:09,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:09,280 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 167 transitions. [2021-05-06 12:04:09,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:04:09,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:09,281 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:09,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 12:04:09,281 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:09,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:09,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1154307394, now seen corresponding path program 12 times [2021-05-06 12:04:09,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:09,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530764698] [2021-05-06 12:04:09,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:09,288 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:09,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:09,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:09,317 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:09,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,340 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:09,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,343 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:09,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:09,375 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:09,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,388 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:09,391 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:09,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:09,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:09,421 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:09,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,437 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:09,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:09,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:09,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:09,466 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:09,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:09,476 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:09,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:09,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:09,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:09,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:09,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:09,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:09,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:10,013 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:10,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530764698] [2021-05-06 12:04:10,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [530764698] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:10,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:10,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:10,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307103912] [2021-05-06 12:04:10,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:10,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:10,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:10,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:10,015 INFO L87 Difference]: Start difference. First operand 136 states and 167 transitions. Second operand has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:10,395 INFO L93 Difference]: Finished difference Result 224 states and 279 transitions. [2021-05-06 12:04:10,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:04:10,398 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:04:10,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:10,399 INFO L225 Difference]: With dead ends: 224 [2021-05-06 12:04:10,399 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 12:04:10,399 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 467.2ms TimeCoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:10,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 12:04:10,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 136. [2021-05-06 12:04:10,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 121 states have (on average 1.2396694214876034) internal successors, (150), 124 states have internal predecessors, (150), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:10,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 167 transitions. [2021-05-06 12:04:10,410 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 167 transitions. Word has length 40 [2021-05-06 12:04:10,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:10,411 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 167 transitions. [2021-05-06 12:04:10,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:10,411 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 167 transitions. [2021-05-06 12:04:10,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:04:10,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:10,411 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:10,411 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 12:04:10,411 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:10,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:10,412 INFO L82 PathProgramCache]: Analyzing trace with hash -1971955844, now seen corresponding path program 13 times [2021-05-06 12:04:10,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:10,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2000407915] [2021-05-06 12:04:10,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:10,419 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:10,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:10,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:10,451 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:10,462 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,466 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:10,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:10,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:10,497 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:10,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,508 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:10,516 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:10,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:10,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:10,547 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:10,559 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,562 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:10,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,564 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:10,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:10,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:10,592 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:10,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:10,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:10,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:10,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:10,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:10,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:10,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:10,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:10,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:11,120 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:11,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2000407915] [2021-05-06 12:04:11,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2000407915] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:11,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:11,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:11,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868978758] [2021-05-06 12:04:11,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:11,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:11,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:11,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:11,122 INFO L87 Difference]: Start difference. First operand 136 states and 167 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:11,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:11,435 INFO L93 Difference]: Finished difference Result 221 states and 276 transitions. [2021-05-06 12:04:11,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:11,437 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:04:11,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:11,440 INFO L225 Difference]: With dead ends: 221 [2021-05-06 12:04:11,440 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 12:04:11,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 478.6ms TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:11,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 12:04:11,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 136. [2021-05-06 12:04:11,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 121 states have (on average 1.2396694214876034) internal successors, (150), 124 states have internal predecessors, (150), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:11,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 167 transitions. [2021-05-06 12:04:11,452 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 167 transitions. Word has length 40 [2021-05-06 12:04:11,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:11,452 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 167 transitions. [2021-05-06 12:04:11,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:11,452 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 167 transitions. [2021-05-06 12:04:11,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:04:11,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:11,452 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:11,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 12:04:11,452 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:11,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:11,453 INFO L82 PathProgramCache]: Analyzing trace with hash 734663550, now seen corresponding path program 14 times [2021-05-06 12:04:11,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:11,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1482744999] [2021-05-06 12:04:11,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:11,459 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:11,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:11,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:11,487 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:11,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,501 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:11,510 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:11,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:11,531 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:11,540 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,541 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:11,544 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:11,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,556 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:11,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:11,581 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:11,595 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,597 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:11,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:11,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:11,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:11,627 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:11,638 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:11,639 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:11,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:11,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:11,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:11,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:11,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:11,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:11,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:12,160 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:12,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1482744999] [2021-05-06 12:04:12,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1482744999] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:12,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:12,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:12,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935334680] [2021-05-06 12:04:12,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:12,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:12,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:12,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:12,162 INFO L87 Difference]: Start difference. First operand 136 states and 167 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:12,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:12,563 INFO L93 Difference]: Finished difference Result 219 states and 274 transitions. [2021-05-06 12:04:12,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:12,563 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:04:12,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:12,564 INFO L225 Difference]: With dead ends: 219 [2021-05-06 12:04:12,564 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 12:04:12,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 492.7ms TimeCoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:12,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 12:04:12,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 136. [2021-05-06 12:04:12,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 121 states have (on average 1.2396694214876034) internal successors, (150), 124 states have internal predecessors, (150), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:12,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 167 transitions. [2021-05-06 12:04:12,575 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 167 transitions. Word has length 40 [2021-05-06 12:04:12,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:12,575 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 167 transitions. [2021-05-06 12:04:12,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:12,575 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 167 transitions. [2021-05-06 12:04:12,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 12:04:12,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:12,576 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:12,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 12:04:12,576 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:12,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:12,576 INFO L82 PathProgramCache]: Analyzing trace with hash -276453700, now seen corresponding path program 15 times [2021-05-06 12:04:12,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:12,576 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787388550] [2021-05-06 12:04:12,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:12,582 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:12,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:12,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:12,612 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:12,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,629 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:12,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:12,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:12,662 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:12,672 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,673 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:12,675 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:12,676 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:12,689 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:12,703 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:12,713 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,714 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:12,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:12,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:12,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:12,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:12,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:12,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:12,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:13,237 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:13,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787388550] [2021-05-06 12:04:13,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [787388550] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:13,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:13,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:13,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346669953] [2021-05-06 12:04:13,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:13,238 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:13,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:13,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:13,238 INFO L87 Difference]: Start difference. First operand 136 states and 167 transitions. Second operand has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 22 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:13,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:13,574 INFO L93 Difference]: Finished difference Result 230 states and 289 transitions. [2021-05-06 12:04:13,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:13,574 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 22 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2021-05-06 12:04:13,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:13,575 INFO L225 Difference]: With dead ends: 230 [2021-05-06 12:04:13,575 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 12:04:13,575 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 493.1ms TimeCoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:13,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 12:04:13,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 139. [2021-05-06 12:04:13,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 124 states have (on average 1.2419354838709677) internal successors, (154), 127 states have internal predecessors, (154), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:13,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 171 transitions. [2021-05-06 12:04:13,586 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 171 transitions. Word has length 40 [2021-05-06 12:04:13,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:13,586 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 171 transitions. [2021-05-06 12:04:13,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 22 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:13,587 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 171 transitions. [2021-05-06 12:04:13,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:13,587 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:13,587 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:13,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 12:04:13,587 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:13,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:13,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1742267585, now seen corresponding path program 16 times [2021-05-06 12:04:13,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:13,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685329359] [2021-05-06 12:04:13,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:13,598 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:13,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:13,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:13,628 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:13,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,643 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:13,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:13,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:13,675 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:13,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,685 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:13,690 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:13,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:13,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:13,721 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:13,735 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,738 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:13,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:13,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:13,768 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:13,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:13,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:13,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:13,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:13,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:14,284 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:14,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685329359] [2021-05-06 12:04:14,285 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [685329359] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:14,285 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:14,285 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:04:14,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263972541] [2021-05-06 12:04:14,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:04:14,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:14,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:04:14,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:04:14,286 INFO L87 Difference]: Start difference. First operand 139 states and 171 transitions. Second operand has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:14,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:14,599 INFO L93 Difference]: Finished difference Result 230 states and 286 transitions. [2021-05-06 12:04:14,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:04:14,599 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:14,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:14,600 INFO L225 Difference]: With dead ends: 230 [2021-05-06 12:04:14,600 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 12:04:14,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 7 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 474.3ms TimeCoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:14,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 12:04:14,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 142. [2021-05-06 12:04:14,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 127 states have (on average 1.236220472440945) internal successors, (157), 130 states have internal predecessors, (157), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:14,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 174 transitions. [2021-05-06 12:04:14,613 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 174 transitions. Word has length 43 [2021-05-06 12:04:14,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:14,613 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 174 transitions. [2021-05-06 12:04:14,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:14,613 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 174 transitions. [2021-05-06 12:04:14,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:14,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:14,613 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:14,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 12:04:14,613 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:14,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:14,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1680227971, now seen corresponding path program 17 times [2021-05-06 12:04:14,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:14,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994630488] [2021-05-06 12:04:14,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:14,627 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:14,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:14,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:14,655 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:14,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,671 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:14,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:14,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:14,705 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:14,715 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,715 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:14,722 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:14,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:14,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:14,750 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:14,765 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,768 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:14,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:14,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:14,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:14,795 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:14,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:14,804 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:14,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:14,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:14,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:14,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:14,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:14,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:14,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:15,332 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:15,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994630488] [2021-05-06 12:04:15,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1994630488] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:15,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:15,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:15,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516844943] [2021-05-06 12:04:15,332 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:15,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:15,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:15,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:15,334 INFO L87 Difference]: Start difference. First operand 142 states and 174 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:15,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:15,747 INFO L93 Difference]: Finished difference Result 233 states and 289 transitions. [2021-05-06 12:04:15,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:15,748 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:15,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:15,748 INFO L225 Difference]: With dead ends: 233 [2021-05-06 12:04:15,748 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 12:04:15,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 497.1ms TimeCoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:15,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 12:04:15,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 142. [2021-05-06 12:04:15,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 127 states have (on average 1.236220472440945) internal successors, (157), 130 states have internal predecessors, (157), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:15,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 174 transitions. [2021-05-06 12:04:15,762 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 174 transitions. Word has length 43 [2021-05-06 12:04:15,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:15,762 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 174 transitions. [2021-05-06 12:04:15,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:15,762 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 174 transitions. [2021-05-06 12:04:15,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:15,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:15,763 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:15,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 12:04:15,763 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:15,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:15,763 INFO L82 PathProgramCache]: Analyzing trace with hash 809300991, now seen corresponding path program 18 times [2021-05-06 12:04:15,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:15,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939260254] [2021-05-06 12:04:15,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:15,770 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:15,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:15,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:15,797 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:15,808 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,811 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:15,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:15,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:15,838 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:15,847 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,848 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:15,850 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:15,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:15,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:15,882 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:15,893 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,896 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:15,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,909 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:15,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:15,926 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:15,935 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,935 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:15,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:16,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:16,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:16,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:16,517 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:16,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939260254] [2021-05-06 12:04:16,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [939260254] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:16,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:16,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:16,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550208707] [2021-05-06 12:04:16,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:16,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:16,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:16,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:16,518 INFO L87 Difference]: Start difference. First operand 142 states and 174 transitions. Second operand has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:16,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:16,837 INFO L93 Difference]: Finished difference Result 230 states and 286 transitions. [2021-05-06 12:04:16,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:16,837 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:16,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:16,838 INFO L225 Difference]: With dead ends: 230 [2021-05-06 12:04:16,838 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 12:04:16,838 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 531.7ms TimeCoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:16,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 12:04:16,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 142. [2021-05-06 12:04:16,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 127 states have (on average 1.236220472440945) internal successors, (157), 130 states have internal predecessors, (157), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:16,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 174 transitions. [2021-05-06 12:04:16,852 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 174 transitions. Word has length 43 [2021-05-06 12:04:16,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:16,852 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 174 transitions. [2021-05-06 12:04:16,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:16,852 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 174 transitions. [2021-05-06 12:04:16,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:16,853 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:16,853 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:16,853 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2021-05-06 12:04:16,853 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:16,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:16,853 INFO L82 PathProgramCache]: Analyzing trace with hash -8347459, now seen corresponding path program 19 times [2021-05-06 12:04:16,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:16,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046662559] [2021-05-06 12:04:16,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:16,862 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:16,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:16,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:16,887 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:16,897 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,900 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:16,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:16,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:16,930 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:16,939 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,940 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:16,946 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:16,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:16,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:16,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:16,981 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:16,992 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:16,995 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:17,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:17,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:17,024 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:17,031 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:17,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:17,042 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:17,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:17,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:17,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:17,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:17,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:17,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:17,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:17,601 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:17,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046662559] [2021-05-06 12:04:17,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1046662559] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:17,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:17,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:17,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36356082] [2021-05-06 12:04:17,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:17,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:17,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:17,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:17,602 INFO L87 Difference]: Start difference. First operand 142 states and 174 transitions. Second operand has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:18,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:18,024 INFO L93 Difference]: Finished difference Result 227 states and 283 transitions. [2021-05-06 12:04:18,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:18,024 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:18,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:18,025 INFO L225 Difference]: With dead ends: 227 [2021-05-06 12:04:18,025 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 12:04:18,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 535.9ms TimeCoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:18,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 12:04:18,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 142. [2021-05-06 12:04:18,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 127 states have (on average 1.236220472440945) internal successors, (157), 130 states have internal predecessors, (157), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:18,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 174 transitions. [2021-05-06 12:04:18,040 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 174 transitions. Word has length 43 [2021-05-06 12:04:18,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:18,040 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 174 transitions. [2021-05-06 12:04:18,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:18,041 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 174 transitions. [2021-05-06 12:04:18,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:18,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:18,041 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:18,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 12:04:18,041 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:18,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:18,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1596695361, now seen corresponding path program 20 times [2021-05-06 12:04:18,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:18,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622695608] [2021-05-06 12:04:18,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:18,048 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:18,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:18,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:18,077 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:18,089 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,092 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:18,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:18,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:18,121 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:18,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:18,134 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:18,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:18,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:18,168 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:18,179 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,182 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:18,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:18,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:18,196 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:18,211 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:18,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:18,222 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:18,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:18,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:18,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:18,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:18,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:18,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:18,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:18,811 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:18,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622695608] [2021-05-06 12:04:18,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1622695608] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:18,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:18,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:18,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226204870] [2021-05-06 12:04:18,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:18,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:18,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:18,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:18,812 INFO L87 Difference]: Start difference. First operand 142 states and 174 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:19,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:19,258 INFO L93 Difference]: Finished difference Result 225 states and 281 transitions. [2021-05-06 12:04:19,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:19,259 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:19,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:19,260 INFO L225 Difference]: With dead ends: 225 [2021-05-06 12:04:19,260 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 12:04:19,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 566.2ms TimeCoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:19,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 12:04:19,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 142. [2021-05-06 12:04:19,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 127 states have (on average 1.236220472440945) internal successors, (157), 130 states have internal predecessors, (157), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:19,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 174 transitions. [2021-05-06 12:04:19,275 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 174 transitions. Word has length 43 [2021-05-06 12:04:19,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:19,275 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 174 transitions. [2021-05-06 12:04:19,275 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:19,275 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 174 transitions. [2021-05-06 12:04:19,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:04:19,276 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:19,276 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:19,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2021-05-06 12:04:19,276 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:19,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:19,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1687154685, now seen corresponding path program 21 times [2021-05-06 12:04:19,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:19,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646716367] [2021-05-06 12:04:19,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:19,284 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:19,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:19,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:19,315 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:19,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,329 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:19,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:19,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:19,358 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:19,368 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,369 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:19,371 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:19,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:19,394 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:19,401 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:19,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:19,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:19,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:19,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:19,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:19,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:19,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:19,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:19,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:20,014 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:20,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646716367] [2021-05-06 12:04:20,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1646716367] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:20,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:20,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:20,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983331024] [2021-05-06 12:04:20,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:20,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:20,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:20,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:20,015 INFO L87 Difference]: Start difference. First operand 142 states and 174 transitions. Second operand has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:20,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:20,354 INFO L93 Difference]: Finished difference Result 236 states and 296 transitions. [2021-05-06 12:04:20,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:20,354 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-05-06 12:04:20,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:20,355 INFO L225 Difference]: With dead ends: 236 [2021-05-06 12:04:20,355 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 12:04:20,356 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 565.4ms TimeCoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:20,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 12:04:20,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 145. [2021-05-06 12:04:20,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 130 states have (on average 1.2384615384615385) internal successors, (161), 133 states have internal predecessors, (161), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:20,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 178 transitions. [2021-05-06 12:04:20,370 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 178 transitions. Word has length 43 [2021-05-06 12:04:20,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:20,370 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 178 transitions. [2021-05-06 12:04:20,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:20,370 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 178 transitions. [2021-05-06 12:04:20,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 12:04:20,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:20,371 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:20,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 12:04:20,371 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:20,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:20,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1308477019, now seen corresponding path program 2 times [2021-05-06 12:04:20,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:20,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989664547] [2021-05-06 12:04:20,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:20,381 WARN L240 tifierPushTermWalker]: treesize reduction 86, result has 52.2 percent of original size [2021-05-06 12:04:20,425 WARN L245 tifierPushTermWalker]: treesize reduction 86, result has 52.2 percent of original size 94 [2021-05-06 12:04:20,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,461 WARN L240 tifierPushTermWalker]: treesize reduction 76, result has 55.3 percent of original size [2021-05-06 12:04:20,506 WARN L245 tifierPushTermWalker]: treesize reduction 76, result has 55.3 percent of original size 94 [2021-05-06 12:04:20,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,533 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:20,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:20,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:20,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:20,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:20,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:20,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:20,630 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:20,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989664547] [2021-05-06 12:04:20,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1989664547] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:20,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:20,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 12:04:20,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050130389] [2021-05-06 12:04:20,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 12:04:20,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:20,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 12:04:20,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:04:20,632 INFO L87 Difference]: Start difference. First operand 145 states and 178 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:20,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:20,787 INFO L93 Difference]: Finished difference Result 272 states and 342 transitions. [2021-05-06 12:04:20,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 12:04:20,788 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-06 12:04:20,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:20,789 INFO L225 Difference]: With dead ends: 272 [2021-05-06 12:04:20,789 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 12:04:20,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 100.7ms TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-05-06 12:04:20,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 12:04:20,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 163. [2021-05-06 12:04:20,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 148 states have (on average 1.2297297297297298) internal successors, (182), 151 states have internal predecessors, (182), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:20,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 199 transitions. [2021-05-06 12:04:20,805 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 199 transitions. Word has length 45 [2021-05-06 12:04:20,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:20,805 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 199 transitions. [2021-05-06 12:04:20,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:20,805 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 199 transitions. [2021-05-06 12:04:20,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:20,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:20,806 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:20,806 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2021-05-06 12:04:20,806 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:20,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:20,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1569322332, now seen corresponding path program 22 times [2021-05-06 12:04:20,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:20,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912608302] [2021-05-06 12:04:20,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:20,813 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:20,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:20,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:20,847 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:20,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,861 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:20,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:20,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:20,892 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:20,901 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:20,904 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:20,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:20,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:20,933 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:20,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,948 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:20,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:20,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:20,977 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:20,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,987 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:20,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:21,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:21,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:21,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:21,610 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:21,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912608302] [2021-05-06 12:04:21,610 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1912608302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:21,610 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:21,610 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:04:21,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645990928] [2021-05-06 12:04:21,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:04:21,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:21,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:04:21,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:04:21,611 INFO L87 Difference]: Start difference. First operand 163 states and 199 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:22,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:22,005 INFO L93 Difference]: Finished difference Result 278 states and 341 transitions. [2021-05-06 12:04:22,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:04:22,006 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:22,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:22,006 INFO L225 Difference]: With dead ends: 278 [2021-05-06 12:04:22,006 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 12:04:22,007 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 632.6ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:22,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 12:04:22,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 166. [2021-05-06 12:04:22,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:22,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 202 transitions. [2021-05-06 12:04:22,025 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 202 transitions. Word has length 46 [2021-05-06 12:04:22,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:22,025 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 202 transitions. [2021-05-06 12:04:22,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:22,025 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 202 transitions. [2021-05-06 12:04:22,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:22,026 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:22,026 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:22,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 12:04:22,026 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:22,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:22,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1339441570, now seen corresponding path program 23 times [2021-05-06 12:04:22,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:22,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869558577] [2021-05-06 12:04:22,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:22,032 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:22,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:22,053 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:22,060 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:22,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,073 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:22,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:22,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:22,100 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:22,122 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,122 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:22,125 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:22,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:22,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:22,154 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:22,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,171 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:22,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:22,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:22,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:22,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,209 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:22,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:22,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:22,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:22,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:22,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:22,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:22,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:22,794 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:22,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869558577] [2021-05-06 12:04:22,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [869558577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:22,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:22,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:22,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731360540] [2021-05-06 12:04:22,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:22,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:22,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:22,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:22,795 INFO L87 Difference]: Start difference. First operand 166 states and 202 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:23,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:23,248 INFO L93 Difference]: Finished difference Result 281 states and 344 transitions. [2021-05-06 12:04:23,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:23,248 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:23,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:23,249 INFO L225 Difference]: With dead ends: 281 [2021-05-06 12:04:23,249 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 12:04:23,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 550.2ms TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:23,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 12:04:23,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 166. [2021-05-06 12:04:23,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:23,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 202 transitions. [2021-05-06 12:04:23,275 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 202 transitions. Word has length 46 [2021-05-06 12:04:23,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:23,276 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 202 transitions. [2021-05-06 12:04:23,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:23,276 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 202 transitions. [2021-05-06 12:04:23,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:23,276 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:23,276 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:23,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2021-05-06 12:04:23,276 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:23,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:23,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1277401956, now seen corresponding path program 24 times [2021-05-06 12:04:23,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:23,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134145229] [2021-05-06 12:04:23,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:23,283 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:23,283 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,291 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:23,292 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:23,308 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:23,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,321 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:23,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:23,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:23,347 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:23,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,358 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:23,360 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:23,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:23,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:23,389 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:23,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,403 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:23,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,413 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:23,427 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:23,434 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:23,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,444 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:23,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:23,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:23,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:23,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:24,042 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:24,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134145229] [2021-05-06 12:04:24,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [134145229] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:24,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:24,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:24,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132277815] [2021-05-06 12:04:24,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:24,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:24,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:24,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:24,043 INFO L87 Difference]: Start difference. First operand 166 states and 202 transitions. Second operand has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:24,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:24,394 INFO L93 Difference]: Finished difference Result 278 states and 341 transitions. [2021-05-06 12:04:24,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:24,395 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:24,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:24,396 INFO L225 Difference]: With dead ends: 278 [2021-05-06 12:04:24,396 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 12:04:24,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 566.8ms TimeCoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:24,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 12:04:24,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 166. [2021-05-06 12:04:24,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:24,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 202 transitions. [2021-05-06 12:04:24,421 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 202 transitions. Word has length 46 [2021-05-06 12:04:24,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:24,421 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 202 transitions. [2021-05-06 12:04:24,421 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:24,421 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 202 transitions. [2021-05-06 12:04:24,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:24,421 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:24,421 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:24,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2021-05-06 12:04:24,422 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:24,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:24,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1212127006, now seen corresponding path program 25 times [2021-05-06 12:04:24,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:24,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598274291] [2021-05-06 12:04:24,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:24,428 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:24,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:24,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:24,452 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:24,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,465 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:24,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:24,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:24,496 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:24,504 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,505 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:24,511 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:24,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,523 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:24,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:24,538 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:24,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,551 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:24,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:24,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:24,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:24,578 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:24,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:24,588 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:24,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:24,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:24,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:24,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:24,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:24,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:24,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:25,201 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:25,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598274291] [2021-05-06 12:04:25,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1598274291] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:25,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:25,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:25,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749822712] [2021-05-06 12:04:25,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:25,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:25,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:25,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=598, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:25,202 INFO L87 Difference]: Start difference. First operand 166 states and 202 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 23 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:25,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:25,690 INFO L93 Difference]: Finished difference Result 275 states and 338 transitions. [2021-05-06 12:04:25,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:25,691 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 23 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:25,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:25,691 INFO L225 Difference]: With dead ends: 275 [2021-05-06 12:04:25,691 INFO L226 Difference]: Without dead ends: 188 [2021-05-06 12:04:25,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 581.3ms TimeCoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:25,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-06 12:04:25,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 166. [2021-05-06 12:04:25,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:25,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 202 transitions. [2021-05-06 12:04:25,711 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 202 transitions. Word has length 46 [2021-05-06 12:04:25,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:25,711 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 202 transitions. [2021-05-06 12:04:25,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 23 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:25,711 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 202 transitions. [2021-05-06 12:04:25,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:25,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:25,712 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:25,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 12:04:25,712 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:25,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:25,713 INFO L82 PathProgramCache]: Analyzing trace with hash 394478556, now seen corresponding path program 26 times [2021-05-06 12:04:25,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:25,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694622277] [2021-05-06 12:04:25,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:25,719 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:25,720 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:25,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:25,748 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:25,760 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,763 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:25,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:25,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:25,794 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:25,803 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,804 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:25,810 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:25,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:25,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:25,846 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:25,858 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,862 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:25,873 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,883 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:25,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:25,893 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:25,903 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,904 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:25,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:25,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:25,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:25,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:25,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:26,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:26,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:26,570 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:26,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694622277] [2021-05-06 12:04:26,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1694622277] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:26,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:26,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:26,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422135015] [2021-05-06 12:04:26,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:26,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:26,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:26,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:26,571 INFO L87 Difference]: Start difference. First operand 166 states and 202 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:27,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:27,038 INFO L93 Difference]: Finished difference Result 272 states and 335 transitions. [2021-05-06 12:04:27,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:27,039 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:27,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:27,039 INFO L225 Difference]: With dead ends: 272 [2021-05-06 12:04:27,039 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 12:04:27,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 641.5ms TimeCoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:27,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 12:04:27,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 166. [2021-05-06 12:04:27,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:27,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 202 transitions. [2021-05-06 12:04:27,059 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 202 transitions. Word has length 46 [2021-05-06 12:04:27,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:27,059 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 202 transitions. [2021-05-06 12:04:27,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:27,059 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 202 transitions. [2021-05-06 12:04:27,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:27,060 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:27,060 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:27,060 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2021-05-06 12:04:27,060 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:27,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:27,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1193869346, now seen corresponding path program 27 times [2021-05-06 12:04:27,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:27,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179278065] [2021-05-06 12:04:27,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:27,066 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:27,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:27,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:27,094 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:27,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:27,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:27,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:27,141 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:27,151 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,152 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:27,154 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:27,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,167 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:27,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:27,187 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:27,199 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,201 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:27,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:27,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:27,232 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:27,242 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:27,243 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:27,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:27,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:27,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:27,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:27,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:27,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:27,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:27,897 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:27,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179278065] [2021-05-06 12:04:27,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1179278065] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:27,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:27,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:27,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723590058] [2021-05-06 12:04:27,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:27,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:27,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:27,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:27,898 INFO L87 Difference]: Start difference. First operand 166 states and 202 transitions. Second operand has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 25 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:28,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:28,271 INFO L93 Difference]: Finished difference Result 270 states and 333 transitions. [2021-05-06 12:04:28,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:28,271 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 25 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:28,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:28,272 INFO L225 Difference]: With dead ends: 270 [2021-05-06 12:04:28,272 INFO L226 Difference]: Without dead ends: 183 [2021-05-06 12:04:28,272 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 618.7ms TimeCoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:28,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-06 12:04:28,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 166. [2021-05-06 12:04:28,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 151 states have (on average 1.2251655629139073) internal successors, (185), 154 states have internal predecessors, (185), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:28,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 202 transitions. [2021-05-06 12:04:28,291 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 202 transitions. Word has length 46 [2021-05-06 12:04:28,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:28,292 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 202 transitions. [2021-05-06 12:04:28,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 25 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:28,292 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 202 transitions. [2021-05-06 12:04:28,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:04:28,292 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:28,292 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:28,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2021-05-06 12:04:28,292 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:28,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:28,293 INFO L82 PathProgramCache]: Analyzing trace with hash 2089980700, now seen corresponding path program 28 times [2021-05-06 12:04:28,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:28,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402642277] [2021-05-06 12:04:28,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:28,298 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:28,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:28,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:28,324 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:28,336 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:28,338 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:28,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,348 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:28,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:28,373 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:28,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:28,383 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:28,384 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:28,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:28,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:28,413 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:28,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:28,425 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:28,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:28,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:28,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:28,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:28,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:28,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:28,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:29,100 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:29,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402642277] [2021-05-06 12:04:29,101 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1402642277] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:29,101 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:29,101 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:04:29,101 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372815166] [2021-05-06 12:04:29,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:04:29,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:29,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:04:29,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:29,102 INFO L87 Difference]: Start difference. First operand 166 states and 202 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 26 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:29,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:29,484 INFO L93 Difference]: Finished difference Result 281 states and 348 transitions. [2021-05-06 12:04:29,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:29,485 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 26 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2021-05-06 12:04:29,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:29,485 INFO L225 Difference]: With dead ends: 281 [2021-05-06 12:04:29,485 INFO L226 Difference]: Without dead ends: 183 [2021-05-06 12:04:29,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 632.9ms TimeCoverageRelationStatistics Valid=135, Invalid=857, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:29,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-06 12:04:29,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 169. [2021-05-06 12:04:29,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 154 states have (on average 1.2272727272727273) internal successors, (189), 157 states have internal predecessors, (189), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:29,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 206 transitions. [2021-05-06 12:04:29,505 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 206 transitions. Word has length 46 [2021-05-06 12:04:29,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:29,505 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 206 transitions. [2021-05-06 12:04:29,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 26 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:29,505 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 206 transitions. [2021-05-06 12:04:29,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:29,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:29,506 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:29,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148 [2021-05-06 12:04:29,506 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:29,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:29,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1745750559, now seen corresponding path program 29 times [2021-05-06 12:04:29,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:29,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257095828] [2021-05-06 12:04:29,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:29,512 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:29,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:29,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:29,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:29,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,571 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:29,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:29,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:29,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:29,616 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,617 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:29,620 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:29,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:29,642 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:29,650 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:29,662 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,665 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:29,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:29,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:29,680 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:29,694 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:29,704 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:29,705 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:29,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:29,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:29,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,816 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:29,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:30,343 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:30,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257095828] [2021-05-06 12:04:30,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1257095828] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:30,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:30,343 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:04:30,343 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105477123] [2021-05-06 12:04:30,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:04:30,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:30,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:04:30,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:04:30,344 INFO L87 Difference]: Start difference. First operand 169 states and 206 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:30,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:30,748 INFO L93 Difference]: Finished difference Result 287 states and 351 transitions. [2021-05-06 12:04:30,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:04:30,748 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:30,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:30,749 INFO L225 Difference]: With dead ends: 287 [2021-05-06 12:04:30,749 INFO L226 Difference]: Without dead ends: 200 [2021-05-06 12:04:30,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 610.7ms TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:30,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-06 12:04:30,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 172. [2021-05-06 12:04:30,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:30,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:30,770 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:30,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:30,771 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:30,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:30,771 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:30,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:30,771 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:30,771 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:30,771 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153 [2021-05-06 12:04:30,771 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:30,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:30,772 INFO L82 PathProgramCache]: Analyzing trace with hash 2020510173, now seen corresponding path program 30 times [2021-05-06 12:04:30,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:30,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593335383] [2021-05-06 12:04:30,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:30,782 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:30,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,795 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:30,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:30,811 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:30,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,830 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:30,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:30,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:30,864 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:30,874 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:30,877 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:30,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:30,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:30,916 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:30,931 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,934 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:30,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,935 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:30,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:30,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:30,966 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:30,978 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:30,979 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:30,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:31,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:31,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:31,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:31,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:31,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:31,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:31,674 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:31,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593335383] [2021-05-06 12:04:31,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [593335383] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:31,674 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:31,674 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:31,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542527806] [2021-05-06 12:04:31,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:31,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:31,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:31,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:31,675 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:32,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:32,056 INFO L93 Difference]: Finished difference Result 290 states and 354 transitions. [2021-05-06 12:04:32,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:32,057 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:32,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:32,057 INFO L225 Difference]: With dead ends: 290 [2021-05-06 12:04:32,057 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 12:04:32,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 647.2ms TimeCoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:32,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 12:04:32,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 172. [2021-05-06 12:04:32,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:32,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:32,081 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:32,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:32,081 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:32,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:32,081 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:32,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:32,082 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:32,082 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:32,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 12:04:32,082 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:32,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:32,082 INFO L82 PathProgramCache]: Analyzing trace with hash -888253729, now seen corresponding path program 31 times [2021-05-06 12:04:32,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:32,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279997282] [2021-05-06 12:04:32,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:32,104 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:32,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:32,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:32,136 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:32,149 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:32,152 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:32,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,162 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:32,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:32,182 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:32,193 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:32,193 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:32,196 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:32,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:32,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:32,225 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:32,237 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:32,240 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:32,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:32,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:32,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:32,269 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:32,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:32,280 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:32,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:32,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:32,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:32,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:32,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:32,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:32,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:32,960 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:32,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279997282] [2021-05-06 12:04:32,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1279997282] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:32,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:32,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:32,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045526979] [2021-05-06 12:04:32,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:32,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:32,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:32,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=601, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:32,961 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:33,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:33,379 INFO L93 Difference]: Finished difference Result 287 states and 351 transitions. [2021-05-06 12:04:33,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:33,380 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:33,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:33,381 INFO L225 Difference]: With dead ends: 287 [2021-05-06 12:04:33,381 INFO L226 Difference]: Without dead ends: 200 [2021-05-06 12:04:33,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 651.5ms TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:33,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-06 12:04:33,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 172. [2021-05-06 12:04:33,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:33,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:33,410 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:33,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:33,410 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:33,410 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:33,410 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:33,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:33,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:33,412 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:33,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163 [2021-05-06 12:04:33,412 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:33,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:33,412 INFO L82 PathProgramCache]: Analyzing trace with hash -826214115, now seen corresponding path program 32 times [2021-05-06 12:04:33,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:33,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618714784] [2021-05-06 12:04:33,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:33,424 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:33,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,445 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:33,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:33,454 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:33,466 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,469 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:33,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:33,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:33,499 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:33,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,509 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:33,512 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:33,524 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:33,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:33,544 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:33,556 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,559 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:33,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:33,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:33,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:33,600 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:33,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:33,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:33,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:33,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:33,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:34,336 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:34,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618714784] [2021-05-06 12:04:34,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [618714784] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:34,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:34,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:34,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497921892] [2021-05-06 12:04:34,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:34,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:34,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:34,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:34,337 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:34,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:34,736 INFO L93 Difference]: Finished difference Result 284 states and 348 transitions. [2021-05-06 12:04:34,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:34,736 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:34,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:34,737 INFO L225 Difference]: With dead ends: 284 [2021-05-06 12:04:34,737 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 12:04:34,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 701.7ms TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:34,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 12:04:34,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 172. [2021-05-06 12:04:34,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:34,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:34,762 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:34,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:34,762 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:34,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:34,763 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:34,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:34,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:34,763 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:34,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable168 [2021-05-06 12:04:34,763 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:34,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:34,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1663314847, now seen corresponding path program 33 times [2021-05-06 12:04:34,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:34,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686613783] [2021-05-06 12:04:34,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:34,774 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:34,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:34,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:34,803 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:34,814 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,816 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:34,825 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,826 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:34,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:34,844 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:34,853 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,853 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:34,856 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:34,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:34,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:34,882 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:34,892 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,895 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:34,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:34,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:34,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:34,926 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:34,935 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:34,936 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:34,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:35,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:35,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:35,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:35,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:35,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:35,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:35,639 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:35,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686613783] [2021-05-06 12:04:35,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1686613783] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:35,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:35,640 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:35,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151847768] [2021-05-06 12:04:35,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:35,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:35,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:35,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:35,641 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:36,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:36,178 INFO L93 Difference]: Finished difference Result 281 states and 345 transitions. [2021-05-06 12:04:36,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:36,178 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:36,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:36,179 INFO L225 Difference]: With dead ends: 281 [2021-05-06 12:04:36,179 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 12:04:36,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 7 SyntacticMatches, 10 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 668.3ms TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:36,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 12:04:36,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 172. [2021-05-06 12:04:36,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:36,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:36,205 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:36,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:36,205 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:36,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:36,205 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:36,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:36,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:36,206 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:36,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-05-06 12:04:36,206 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:36,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:36,206 INFO L82 PathProgramCache]: Analyzing trace with hash 845666397, now seen corresponding path program 34 times [2021-05-06 12:04:36,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:36,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400090669] [2021-05-06 12:04:36,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:36,214 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:36,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:36,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:36,244 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:36,256 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,258 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:36,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,279 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:36,282 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:36,289 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:36,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,300 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:36,307 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:36,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:36,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:36,340 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:36,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,355 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:36,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:36,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:36,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:36,390 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:36,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:36,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:36,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:36,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:36,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:36,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:36,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:36,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:36,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:37,155 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:37,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400090669] [2021-05-06 12:04:37,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1400090669] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:37,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:37,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:04:37,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104632211] [2021-05-06 12:04:37,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:04:37,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:37,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:04:37,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:37,156 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:37,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:37,665 INFO L93 Difference]: Finished difference Result 278 states and 342 transitions. [2021-05-06 12:04:37,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:37,665 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:37,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:37,666 INFO L225 Difference]: With dead ends: 278 [2021-05-06 12:04:37,666 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 12:04:37,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 7 SyntacticMatches, 9 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 711.9ms TimeCoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:37,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 12:04:37,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 172. [2021-05-06 12:04:37,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:37,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:37,691 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:37,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:37,691 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:37,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:37,692 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:37,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:37,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:37,692 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:37,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable178 [2021-05-06 12:04:37,692 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:37,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:37,692 INFO L82 PathProgramCache]: Analyzing trace with hash -742681505, now seen corresponding path program 35 times [2021-05-06 12:04:37,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:37,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643168205] [2021-05-06 12:04:37,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:37,698 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:37,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:37,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:37,725 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:37,736 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,739 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:37,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:37,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:37,768 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:37,777 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,778 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:37,781 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:37,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:37,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:37,815 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:37,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,829 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:37,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:37,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:37,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:37,854 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:37,863 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:37,864 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:37,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:37,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:37,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:37,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:37,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:37,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:37,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:38,567 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:38,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643168205] [2021-05-06 12:04:38,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1643168205] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:38,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:38,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:04:38,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491849917] [2021-05-06 12:04:38,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:04:38,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:38,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:04:38,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=801, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:38,569 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 27 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:39,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:39,009 INFO L93 Difference]: Finished difference Result 276 states and 340 transitions. [2021-05-06 12:04:39,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:39,010 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 27 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:39,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:39,011 INFO L225 Difference]: With dead ends: 276 [2021-05-06 12:04:39,011 INFO L226 Difference]: Without dead ends: 189 [2021-05-06 12:04:39,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 665.8ms TimeCoverageRelationStatistics Valid=139, Invalid=917, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:04:39,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-06 12:04:39,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 172. [2021-05-06 12:04:39,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 157 states have (on average 1.2229299363057324) internal successors, (192), 160 states have internal predecessors, (192), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:39,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 209 transitions. [2021-05-06 12:04:39,037 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 209 transitions. Word has length 49 [2021-05-06 12:04:39,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:39,037 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 209 transitions. [2021-05-06 12:04:39,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 27 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:39,037 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 209 transitions. [2021-05-06 12:04:39,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:04:39,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:39,037 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:39,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable183 [2021-05-06 12:04:39,038 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:39,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:39,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1753798755, now seen corresponding path program 36 times [2021-05-06 12:04:39,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:39,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210577138] [2021-05-06 12:04:39,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:39,043 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:39,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:39,053 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:39,070 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:39,082 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,085 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:39,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:39,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:39,114 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:39,124 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,125 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:39,126 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:39,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:39,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:39,155 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:39,165 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,166 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:39,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:39,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:39,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:39,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:39,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:39,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:39,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:39,909 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:39,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210577138] [2021-05-06 12:04:39,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1210577138] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:39,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:39,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:04:39,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752195236] [2021-05-06 12:04:39,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:04:39,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:39,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:04:39,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=856, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:39,911 INFO L87 Difference]: Start difference. First operand 172 states and 209 transitions. Second operand has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:40,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:40,349 INFO L93 Difference]: Finished difference Result 287 states and 355 transitions. [2021-05-06 12:04:40,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:04:40,349 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2021-05-06 12:04:40,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:40,350 INFO L225 Difference]: With dead ends: 287 [2021-05-06 12:04:40,350 INFO L226 Difference]: Without dead ends: 189 [2021-05-06 12:04:40,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 715.0ms TimeCoverageRelationStatistics Valid=146, Invalid=976, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:04:40,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-06 12:04:40,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 175. [2021-05-06 12:04:40,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 160 states have (on average 1.225) internal successors, (196), 163 states have internal predecessors, (196), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:40,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 213 transitions. [2021-05-06 12:04:40,376 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 213 transitions. Word has length 49 [2021-05-06 12:04:40,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:40,376 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 213 transitions. [2021-05-06 12:04:40,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:40,376 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 213 transitions. [2021-05-06 12:04:40,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 12:04:40,376 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:40,376 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:40,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable187 [2021-05-06 12:04:40,376 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:40,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:40,377 INFO L82 PathProgramCache]: Analyzing trace with hash 207767157, now seen corresponding path program 3 times [2021-05-06 12:04:40,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:40,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812537111] [2021-05-06 12:04:40,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:40,387 WARN L240 tifierPushTermWalker]: treesize reduction 95, result has 45.4 percent of original size [2021-05-06 12:04:40,429 WARN L245 tifierPushTermWalker]: treesize reduction 95, result has 45.4 percent of original size 79 [2021-05-06 12:04:40,457 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,465 WARN L240 tifierPushTermWalker]: treesize reduction 91, result has 44.5 percent of original size [2021-05-06 12:04:40,502 WARN L245 tifierPushTermWalker]: treesize reduction 91, result has 44.5 percent of original size 73 [2021-05-06 12:04:40,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:40,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:40,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:40,650 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:40,651 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812537111] [2021-05-06 12:04:40,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [812537111] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:40,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:40,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:04:40,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555744897] [2021-05-06 12:04:40,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:04:40,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:40,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:04:40,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:04:40,651 INFO L87 Difference]: Start difference. First operand 175 states and 213 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:40,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:40,833 INFO L93 Difference]: Finished difference Result 332 states and 410 transitions. [2021-05-06 12:04:40,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:04:40,833 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 51 [2021-05-06 12:04:40,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:40,834 INFO L225 Difference]: With dead ends: 332 [2021-05-06 12:04:40,834 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 12:04:40,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 129.1ms TimeCoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:04:40,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 12:04:40,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 193. [2021-05-06 12:04:40,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2191011235955056) internal successors, (217), 181 states have internal predecessors, (217), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:40,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 234 transitions. [2021-05-06 12:04:40,861 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 234 transitions. Word has length 51 [2021-05-06 12:04:40,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:40,861 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 234 transitions. [2021-05-06 12:04:40,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:04:40,861 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 234 transitions. [2021-05-06 12:04:40,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:40,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:40,862 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:40,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable188 [2021-05-06 12:04:40,862 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:40,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:40,862 INFO L82 PathProgramCache]: Analyzing trace with hash 679090812, now seen corresponding path program 37 times [2021-05-06 12:04:40,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:40,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658164309] [2021-05-06 12:04:40,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:40,876 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:40,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,902 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:40,914 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,917 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:40,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,928 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,945 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:40,954 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,955 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,957 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:40,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,969 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:40,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:40,986 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:40,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,999 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:41,000 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:41,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:41,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:41,013 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:41,028 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:41,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:41,038 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:41,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:41,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:41,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:41,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:41,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:41,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:41,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:41,723 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:41,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658164309] [2021-05-06 12:04:41,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1658164309] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:41,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:41,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:04:41,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450503529] [2021-05-06 12:04:41,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:04:41,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:41,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:04:41,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:04:41,724 INFO L87 Difference]: Start difference. First operand 193 states and 234 transitions. Second operand has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:42,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:42,145 INFO L93 Difference]: Finished difference Result 335 states and 406 transitions. [2021-05-06 12:04:42,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:04:42,145 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:42,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:42,146 INFO L225 Difference]: With dead ends: 335 [2021-05-06 12:04:42,146 INFO L226 Difference]: Without dead ends: 230 [2021-05-06 12:04:42,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 663.5ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:42,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-06 12:04:42,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 196. [2021-05-06 12:04:42,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:42,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:42,176 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:42,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:42,176 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:42,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:42,176 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:42,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:42,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:42,177 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:42,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable193 [2021-05-06 12:04:42,177 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:42,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:42,177 INFO L82 PathProgramCache]: Analyzing trace with hash -164914690, now seen corresponding path program 38 times [2021-05-06 12:04:42,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:42,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [599389358] [2021-05-06 12:04:42,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:42,183 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:42,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:42,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:42,210 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:42,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,224 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:42,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:42,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:42,252 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:42,263 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,263 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:42,265 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:42,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:42,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:42,294 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:42,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,307 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:42,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:42,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:42,329 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:42,336 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:42,345 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:42,346 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:42,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:42,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:42,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:42,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:43,052 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:43,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [599389358] [2021-05-06 12:04:43,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [599389358] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:43,053 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:43,053 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:43,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229700589] [2021-05-06 12:04:43,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:43,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:43,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:43,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:43,054 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:43,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:43,619 INFO L93 Difference]: Finished difference Result 338 states and 409 transitions. [2021-05-06 12:04:43,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:43,620 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:43,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:43,620 INFO L225 Difference]: With dead ends: 338 [2021-05-06 12:04:43,620 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 12:04:43,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 685.1ms TimeCoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:43,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 12:04:43,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 196. [2021-05-06 12:04:43,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:43,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:43,657 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:43,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:43,657 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:43,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:43,657 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:43,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:43,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:43,657 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:43,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable198 [2021-05-06 12:04:43,658 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:43,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:43,658 INFO L82 PathProgramCache]: Analyzing trace with hash 109844924, now seen corresponding path program 39 times [2021-05-06 12:04:43,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:43,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166115764] [2021-05-06 12:04:43,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:43,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:43,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:43,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:43,706 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:43,718 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,720 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:43,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:43,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:43,747 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:43,757 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:43,761 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:43,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:43,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:43,792 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:43,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,811 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:43,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:43,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:43,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:43,840 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:43,850 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:43,851 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:43,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:43,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:43,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:43,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:43,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:43,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:44,567 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:44,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166115764] [2021-05-06 12:04:44,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [166115764] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:44,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:44,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:44,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918773066] [2021-05-06 12:04:44,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:44,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:44,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:44,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=651, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:44,568 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:45,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:45,027 INFO L93 Difference]: Finished difference Result 335 states and 406 transitions. [2021-05-06 12:04:45,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:45,030 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:45,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:45,031 INFO L225 Difference]: With dead ends: 335 [2021-05-06 12:04:45,031 INFO L226 Difference]: Without dead ends: 230 [2021-05-06 12:04:45,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 684.1ms TimeCoverageRelationStatistics Valid=115, Invalid=755, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:45,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-06 12:04:45,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 196. [2021-05-06 12:04:45,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:45,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:45,064 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:45,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:45,064 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:45,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:45,064 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:45,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:45,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:45,065 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:45,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203 [2021-05-06 12:04:45,065 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:45,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:45,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1496048318, now seen corresponding path program 40 times [2021-05-06 12:04:45,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:45,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560438012] [2021-05-06 12:04:45,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:45,072 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:45,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:45,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:45,106 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:45,118 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,120 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:45,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,131 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:45,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:45,149 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:45,158 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,159 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:45,162 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:45,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:45,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:45,190 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:45,202 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,204 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:45,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:45,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:45,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:45,236 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:45,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:45,248 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:45,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:45,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:45,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:45,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:45,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:45,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560438012] [2021-05-06 12:04:45,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1560438012] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:45,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:45,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:45,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915134999] [2021-05-06 12:04:45,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:45,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:45,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:45,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:45,983 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:46,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:46,541 INFO L93 Difference]: Finished difference Result 332 states and 403 transitions. [2021-05-06 12:04:46,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:46,542 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:46,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:46,542 INFO L225 Difference]: With dead ends: 332 [2021-05-06 12:04:46,542 INFO L226 Difference]: Without dead ends: 227 [2021-05-06 12:04:46,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 695.2ms TimeCoverageRelationStatistics Valid=122, Invalid=808, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:46,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-06 12:04:46,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 196. [2021-05-06 12:04:46,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:46,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:46,576 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:46,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:46,576 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:46,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:46,577 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:46,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:46,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:46,577 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:46,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208 [2021-05-06 12:04:46,577 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:46,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:46,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1558087932, now seen corresponding path program 41 times [2021-05-06 12:04:46,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:46,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095826516] [2021-05-06 12:04:46,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:46,586 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:46,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,595 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:46,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:46,613 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:46,625 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,627 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:46,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:46,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:46,658 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:46,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,669 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:46,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:46,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:46,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:46,708 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:46,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,723 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:46,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:46,742 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:46,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:46,752 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:46,763 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:46,764 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:46,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:46,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:46,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:46,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:46,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:46,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:46,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:47,501 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:47,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095826516] [2021-05-06 12:04:47,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1095826516] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:47,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:47,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:04:47,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780731678] [2021-05-06 12:04:47,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:04:47,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:47,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:04:47,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:47,502 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 28 states, 28 states have (on average 1.6428571428571428) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:48,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:48,082 INFO L93 Difference]: Finished difference Result 329 states and 400 transitions. [2021-05-06 12:04:48,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:04:48,084 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.6428571428571428) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:48,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:48,084 INFO L225 Difference]: With dead ends: 329 [2021-05-06 12:04:48,084 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 12:04:48,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 7 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 708.3ms TimeCoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:48,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 12:04:48,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 196. [2021-05-06 12:04:48,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:48,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:48,120 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:48,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:48,120 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:48,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.6428571428571428) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:48,120 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:48,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:48,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:48,121 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:48,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable213 [2021-05-06 12:04:48,121 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:48,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:48,121 INFO L82 PathProgramCache]: Analyzing trace with hash -247350402, now seen corresponding path program 42 times [2021-05-06 12:04:48,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:48,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303551181] [2021-05-06 12:04:48,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:48,127 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:48,138 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,139 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:48,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:48,155 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:48,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:48,169 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:48,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:48,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:48,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:48,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:48,209 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:48,212 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:48,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,231 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:48,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:48,241 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:48,253 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:48,257 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:48,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:48,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:48,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:48,284 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:48,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:48,295 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:48,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:48,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:48,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:48,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:48,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:48,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:48,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:49,044 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:49,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303551181] [2021-05-06 12:04:49,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1303551181] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:49,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:49,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:04:49,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359488058] [2021-05-06 12:04:49,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:04:49,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:49,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:04:49,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:49,045 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:49,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:49,511 INFO L93 Difference]: Finished difference Result 326 states and 397 transitions. [2021-05-06 12:04:49,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:04:49,512 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:49,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:49,512 INFO L225 Difference]: With dead ends: 326 [2021-05-06 12:04:49,512 INFO L226 Difference]: Without dead ends: 221 [2021-05-06 12:04:49,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 7 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 722.8ms TimeCoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:04:49,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-06 12:04:49,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 196. [2021-05-06 12:04:49,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:49,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:49,556 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:49,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:49,557 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:49,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:49,557 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:49,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:49,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:49,558 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:49,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable218 [2021-05-06 12:04:49,558 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:49,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:49,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1064998852, now seen corresponding path program 43 times [2021-05-06 12:04:49,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:49,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1457711319] [2021-05-06 12:04:49,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:49,564 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:49,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:49,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:49,593 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:49,605 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,607 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:49,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:49,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:49,636 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:49,646 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,647 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:49,649 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:49,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:49,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:49,679 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:49,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,692 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:49,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:49,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:49,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:49,722 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:49,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:49,732 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:49,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:49,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:49,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:49,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:49,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:49,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:49,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:50,521 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:50,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1457711319] [2021-05-06 12:04:50,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1457711319] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:50,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:50,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:04:50,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76355196] [2021-05-06 12:04:50,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:04:50,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:50,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:04:50,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=859, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:04:50,522 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 28 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:50,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:50,987 INFO L93 Difference]: Finished difference Result 323 states and 394 transitions. [2021-05-06 12:04:50,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:04:50,987 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 28 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:50,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:50,988 INFO L225 Difference]: With dead ends: 323 [2021-05-06 12:04:50,988 INFO L226 Difference]: Without dead ends: 218 [2021-05-06 12:04:50,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 753.2ms TimeCoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:04:50,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-06 12:04:51,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 196. [2021-05-06 12:04:51,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:51,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:51,023 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:51,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:51,023 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:51,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 28 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:51,023 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:51,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:51,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:51,024 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:51,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable223 [2021-05-06 12:04:51,024 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:51,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:51,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1641620542, now seen corresponding path program 44 times [2021-05-06 12:04:51,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:51,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1778922818] [2021-05-06 12:04:51,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:51,030 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:51,030 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,031 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:51,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:51,057 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:51,069 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,072 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:51,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:51,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:51,101 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:51,111 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,112 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:51,114 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:51,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:51,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:51,146 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:51,158 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,160 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:51,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:51,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:51,188 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:51,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:51,198 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:51,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:51,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:51,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:51,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:51,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:51,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:51,996 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:51,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1778922818] [2021-05-06 12:04:51,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1778922818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:51,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:51,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:04:51,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755557100] [2021-05-06 12:04:51,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:04:51,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:51,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:04:51,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=916, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:04:51,997 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:52,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:52,602 INFO L93 Difference]: Finished difference Result 321 states and 392 transitions. [2021-05-06 12:04:52,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:04:52,603 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:52,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:52,604 INFO L225 Difference]: With dead ends: 321 [2021-05-06 12:04:52,604 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 12:04:52,604 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 7 SyntacticMatches, 9 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 777.1ms TimeCoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:04:52,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 12:04:52,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 196. [2021-05-06 12:04:52,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:52,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2021-05-06 12:04:52,638 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 52 [2021-05-06 12:04:52,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:52,639 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2021-05-06 12:04:52,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:52,639 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2021-05-06 12:04:52,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:04:52,639 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:52,639 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:52,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable228 [2021-05-06 12:04:52,639 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:52,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:52,640 INFO L82 PathProgramCache]: Analyzing trace with hash 630503292, now seen corresponding path program 45 times [2021-05-06 12:04:52,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:52,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123647051] [2021-05-06 12:04:52,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:52,650 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:52,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:52,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:52,676 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:52,687 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:52,690 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:52,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:52,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:52,718 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:52,727 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:52,728 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:52,730 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:52,730 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:52,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:52,757 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:52,767 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:52,767 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:52,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:52,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:52,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:52,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:52,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:52,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:52,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:53,554 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:53,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123647051] [2021-05-06 12:04:53,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1123647051] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:53,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:53,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:04:53,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070423110] [2021-05-06 12:04:53,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:04:53,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:53,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:04:53,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:04:53,556 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 32 states, 32 states have (on average 1.4375) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:54,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:54,140 INFO L93 Difference]: Finished difference Result 332 states and 407 transitions. [2021-05-06 12:04:54,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:04:54,141 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.4375) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 12:04:54,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:54,141 INFO L225 Difference]: With dead ends: 332 [2021-05-06 12:04:54,141 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 12:04:54,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 756.6ms TimeCoverageRelationStatistics Valid=157, Invalid=1103, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:04:54,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 12:04:54,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 199. [2021-05-06 12:04:54,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 184 states have (on average 1.2173913043478262) internal successors, (224), 187 states have internal predecessors, (224), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:54,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 241 transitions. [2021-05-06 12:04:54,176 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 241 transitions. Word has length 52 [2021-05-06 12:04:54,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:54,176 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 241 transitions. [2021-05-06 12:04:54,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.4375) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:54,176 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 241 transitions. [2021-05-06 12:04:54,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:54,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:54,177 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:54,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable232 [2021-05-06 12:04:54,177 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:54,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:54,177 INFO L82 PathProgramCache]: Analyzing trace with hash -2013376257, now seen corresponding path program 46 times [2021-05-06 12:04:54,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:54,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552864593] [2021-05-06 12:04:54,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:54,183 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:54,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:54,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:54,210 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:54,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,224 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:54,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:54,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:54,267 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:54,277 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,277 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:54,280 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:54,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:54,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:54,308 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:54,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,321 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:54,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:54,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:54,350 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:54,359 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,360 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:54,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:54,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:54,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:54,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:54,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:54,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:54,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:55,152 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:55,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552864593] [2021-05-06 12:04:55,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1552864593] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:55,152 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:55,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:04:55,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341726005] [2021-05-06 12:04:55,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:04:55,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:55,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:04:55,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:04:55,153 INFO L87 Difference]: Start difference. First operand 199 states and 241 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:55,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:55,648 INFO L93 Difference]: Finished difference Result 344 states and 416 transitions. [2021-05-06 12:04:55,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:04:55,649 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:55,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:55,649 INFO L225 Difference]: With dead ends: 344 [2021-05-06 12:04:55,650 INFO L226 Difference]: Without dead ends: 239 [2021-05-06 12:04:55,650 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 742.9ms TimeCoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:55,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-05-06 12:04:55,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 202. [2021-05-06 12:04:55,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:55,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:04:55,689 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:04:55,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:55,690 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:04:55,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:55,690 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:04:55,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:55,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:55,690 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:55,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable237 [2021-05-06 12:04:55,690 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:55,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:55,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1252231741, now seen corresponding path program 47 times [2021-05-06 12:04:55,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:55,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610481982] [2021-05-06 12:04:55,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:55,696 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:55,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:55,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:55,721 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:55,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,737 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:55,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:55,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:55,765 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:55,775 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,776 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:55,779 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:55,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:55,790 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:55,806 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:55,818 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,822 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:55,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:55,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:55,851 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:55,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,861 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:55,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:55,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:55,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:55,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:56,641 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:56,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610481982] [2021-05-06 12:04:56,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1610481982] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:56,641 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:56,641 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:04:56,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143631301] [2021-05-06 12:04:56,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:04:56,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:56,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:04:56,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:04:56,642 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:57,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:57,229 INFO L93 Difference]: Finished difference Result 347 states and 419 transitions. [2021-05-06 12:04:57,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:04:57,229 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:57,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:57,230 INFO L225 Difference]: With dead ends: 347 [2021-05-06 12:04:57,230 INFO L226 Difference]: Without dead ends: 242 [2021-05-06 12:04:57,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 749.1ms TimeCoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:57,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-06 12:04:57,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 202. [2021-05-06 12:04:57,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:57,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:04:57,274 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:04:57,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:57,274 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:04:57,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:57,274 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:04:57,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:57,274 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:57,274 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:57,275 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable242 [2021-05-06 12:04:57,275 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:57,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:57,275 INFO L82 PathProgramCache]: Analyzing trace with hash 408226239, now seen corresponding path program 48 times [2021-05-06 12:04:57,275 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:57,275 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423562511] [2021-05-06 12:04:57,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:57,281 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:57,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:57,291 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:57,307 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:57,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:57,322 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:57,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:57,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:57,351 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:57,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:57,361 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:57,363 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:57,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:57,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:57,390 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:57,402 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:57,406 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:57,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,417 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:57,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:57,434 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:57,444 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:57,445 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:57,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:57,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:57,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:57,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:57,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:57,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:57,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:58,244 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:58,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423562511] [2021-05-06 12:04:58,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [423562511] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:58,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:58,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:04:58,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794475574] [2021-05-06 12:04:58,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:04:58,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:58,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:04:58,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=703, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:04:58,245 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:58,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:58,759 INFO L93 Difference]: Finished difference Result 344 states and 416 transitions. [2021-05-06 12:04:58,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:04:58,759 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:04:58,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:58,760 INFO L225 Difference]: With dead ends: 344 [2021-05-06 12:04:58,760 INFO L226 Difference]: Without dead ends: 239 [2021-05-06 12:04:58,760 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 758.6ms TimeCoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:04:58,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-05-06 12:04:58,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 202. [2021-05-06 12:04:58,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:04:58,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:04:58,804 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:04:58,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:58,804 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:04:58,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:58,804 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:04:58,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:04:58,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:58,804 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:58,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable247 [2021-05-06 12:04:58,805 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:58,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:58,805 INFO L82 PathProgramCache]: Analyzing trace with hash 682985853, now seen corresponding path program 49 times [2021-05-06 12:04:58,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:58,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189360620] [2021-05-06 12:04:58,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:58,811 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:04:58,825 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,826 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:58,835 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,843 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:04:58,855 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,857 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:04:58,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:58,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,887 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:04:58,897 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,897 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,900 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:04:58,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:58,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:58,928 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:04:58,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,943 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:04:58,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,953 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:04:58,957 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:04:58,971 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:04:58,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,982 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:59,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:59,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:59,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:04:59,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:59,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:59,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:59,775 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:59,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189360620] [2021-05-06 12:04:59,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1189360620] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:59,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:59,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:04:59,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486508575] [2021-05-06 12:04:59,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:04:59,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:59,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:04:59,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=754, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:04:59,776 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:00,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:00,287 INFO L93 Difference]: Finished difference Result 341 states and 413 transitions. [2021-05-06 12:05:00,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:05:00,287 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:00,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:00,288 INFO L225 Difference]: With dead ends: 341 [2021-05-06 12:05:00,288 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 12:05:00,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 763.5ms TimeCoverageRelationStatistics Valid=126, Invalid=866, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:00,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 12:05:00,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 202. [2021-05-06 12:05:00,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:00,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:05:00,335 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:05:00,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:00,336 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:05:00,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:00,336 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:05:00,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:05:00,336 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:00,336 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:00,336 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable252 [2021-05-06 12:05:00,336 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:00,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:00,336 INFO L82 PathProgramCache]: Analyzing trace with hash 2069189247, now seen corresponding path program 50 times [2021-05-06 12:05:00,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:00,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375316496] [2021-05-06 12:05:00,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:00,342 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:00,343 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:00,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:00,369 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:00,380 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:00,383 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:00,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:00,407 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:00,414 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:00,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:00,425 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:00,427 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:00,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:00,453 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:00,461 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:00,473 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:00,475 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:00,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:00,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:00,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:00,504 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:00,514 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:00,515 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:00,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:00,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:00,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:00,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:00,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:00,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:00,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:01,306 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:01,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375316496] [2021-05-06 12:05:01,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [375316496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:01,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:01,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:05:01,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308716029] [2021-05-06 12:05:01,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:05:01,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:01,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:05:01,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:01,307 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:02,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:02,089 INFO L93 Difference]: Finished difference Result 338 states and 410 transitions. [2021-05-06 12:05:02,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:05:02,090 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:02,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:02,090 INFO L225 Difference]: With dead ends: 338 [2021-05-06 12:05:02,090 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 12:05:02,091 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 820.9ms TimeCoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:02,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 12:05:02,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 202. [2021-05-06 12:05:02,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:02,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:05:02,138 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:05:02,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:02,138 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:05:02,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:02,138 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:05:02,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:05:02,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:02,139 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:02,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable257 [2021-05-06 12:05:02,139 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:02,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:02,139 INFO L82 PathProgramCache]: Analyzing trace with hash 2131228861, now seen corresponding path program 51 times [2021-05-06 12:05:02,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:02,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526238455] [2021-05-06 12:05:02,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:02,154 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:02,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:02,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:02,181 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:02,192 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:02,194 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:02,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:02,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:02,225 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:02,235 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:02,235 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:02,237 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:02,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:02,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:02,267 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:02,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:02,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:02,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:02,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:02,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:02,325 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:02,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:02,336 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:02,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:02,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:02,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:02,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:02,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:02,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:02,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:03,205 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:03,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526238455] [2021-05-06 12:05:03,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [526238455] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:03,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:03,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:05:03,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285740739] [2021-05-06 12:05:03,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:05:03,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:03,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:05:03,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:03,207 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:03,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:03,737 INFO L93 Difference]: Finished difference Result 335 states and 407 transitions. [2021-05-06 12:05:03,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:05:03,738 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:03,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:03,738 INFO L225 Difference]: With dead ends: 335 [2021-05-06 12:05:03,739 INFO L226 Difference]: Without dead ends: 230 [2021-05-06 12:05:03,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 846.1ms TimeCoverageRelationStatistics Valid=140, Invalid=982, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:03,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-06 12:05:03,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 202. [2021-05-06 12:05:03,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:03,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:05:03,791 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:05:03,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:03,791 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:05:03,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:03,792 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:05:03,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:05:03,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:03,792 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:03,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable262 [2021-05-06 12:05:03,792 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:03,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:03,792 INFO L82 PathProgramCache]: Analyzing trace with hash 325790527, now seen corresponding path program 52 times [2021-05-06 12:05:03,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:03,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104806157] [2021-05-06 12:05:03,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:03,799 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:03,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:03,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:03,826 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:03,838 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,840 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:03,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:03,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:03,873 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:03,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,884 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:03,886 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:03,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:03,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:03,915 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:03,927 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,929 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:03,929 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,930 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:03,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:03,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:03,957 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:03,967 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:03,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:03,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:04,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:04,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:04,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:04,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:04,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:04,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:04,825 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:04,825 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104806157] [2021-05-06 12:05:04,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [104806157] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:04,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:04,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:05:04,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075137056] [2021-05-06 12:05:04,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:05:04,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:04,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:05:04,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=919, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:04,826 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:05,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:05,575 INFO L93 Difference]: Finished difference Result 332 states and 404 transitions. [2021-05-06 12:05:05,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:05:05,575 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:05,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:05,576 INFO L225 Difference]: With dead ends: 332 [2021-05-06 12:05:05,576 INFO L226 Difference]: Without dead ends: 227 [2021-05-06 12:05:05,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 7 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 821.8ms TimeCoverageRelationStatistics Valid=147, Invalid=1043, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:05,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-06 12:05:05,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 202. [2021-05-06 12:05:05,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:05,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:05:05,624 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:05:05,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:05,624 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:05:05,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:05,624 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:05:05,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:05:05,624 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:05,625 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:05,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable267 [2021-05-06 12:05:05,625 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:05,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:05,625 INFO L82 PathProgramCache]: Analyzing trace with hash -491857923, now seen corresponding path program 53 times [2021-05-06 12:05:05,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:05,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150243856] [2021-05-06 12:05:05,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:05,632 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:05,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,642 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:05,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:05,663 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:05,678 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:05,681 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:05,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:05,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:05,715 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:05,725 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:05,725 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:05,727 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:05,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:05,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:05,763 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:05,777 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:05,780 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:05,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:05,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:05,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:05,811 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:05,821 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:05,822 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:05,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:05,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:05,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:05,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:05,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:05,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:05,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:06,785 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:06,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150243856] [2021-05-06 12:05:06,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1150243856] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:06,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:06,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:05:06,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961594312] [2021-05-06 12:05:06,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:05:06,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:06,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:05:06,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:06,786 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 32 states, 32 states have (on average 1.53125) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:07,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:07,596 INFO L93 Difference]: Finished difference Result 329 states and 401 transitions. [2021-05-06 12:05:07,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:05:07,597 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:07,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:07,619 INFO L225 Difference]: With dead ends: 329 [2021-05-06 12:05:07,619 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 12:05:07,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 928.9ms TimeCoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:07,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 12:05:07,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 202. [2021-05-06 12:05:07,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:07,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:05:07,671 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:05:07,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:07,671 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:05:07,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:07,671 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:05:07,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:05:07,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:07,671 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:07,671 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable272 [2021-05-06 12:05:07,672 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:07,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:07,672 INFO L82 PathProgramCache]: Analyzing trace with hash -2080205825, now seen corresponding path program 54 times [2021-05-06 12:05:07,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:07,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031854090] [2021-05-06 12:05:07,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:07,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:07,679 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:07,690 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:07,709 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:07,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:07,726 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:07,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:07,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:07,758 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:07,769 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:07,777 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:07,780 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:07,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,790 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:07,792 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:07,817 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:07,830 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:07,833 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:07,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:07,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:07,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:07,891 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:07,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:07,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:07,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:08,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:08,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:08,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:08,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:08,041 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:08,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:08,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:08,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031854090] [2021-05-06 12:05:08,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1031854090] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:08,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:08,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:05:08,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966134524] [2021-05-06 12:05:08,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:05:08,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:08,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:05:08,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:08,983 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 33 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 31 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:09,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:09,653 INFO L93 Difference]: Finished difference Result 327 states and 399 transitions. [2021-05-06 12:05:09,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:05:09,654 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 31 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:09,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:09,654 INFO L225 Difference]: With dead ends: 327 [2021-05-06 12:05:09,654 INFO L226 Difference]: Without dead ends: 222 [2021-05-06 12:05:09,655 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 1019.3ms TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:09,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-06 12:05:09,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 202. [2021-05-06 12:05:09,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 187 states have (on average 1.213903743315508) internal successors, (227), 190 states have internal predecessors, (227), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:09,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2021-05-06 12:05:09,701 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 55 [2021-05-06 12:05:09,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:09,701 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2021-05-06 12:05:09,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 31 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:09,702 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2021-05-06 12:05:09,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:05:09,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:09,702 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:09,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable277 [2021-05-06 12:05:09,702 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:09,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:09,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1203644221, now seen corresponding path program 55 times [2021-05-06 12:05:09,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:09,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909517577] [2021-05-06 12:05:09,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:09,707 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:09,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:09,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:09,734 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:09,746 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,749 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:09,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:09,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:09,776 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:09,786 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,786 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:09,788 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:09,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:09,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:09,822 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:09,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,833 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:09,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:09,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:09,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:09,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:10,809 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:10,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909517577] [2021-05-06 12:05:10,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1909517577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:10,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:10,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:05:10,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298383355] [2021-05-06 12:05:10,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:05:10,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:10,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:05:10,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:10,810 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 32 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:11,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:11,609 INFO L93 Difference]: Finished difference Result 338 states and 414 transitions. [2021-05-06 12:05:11,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:05:11,609 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 32 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 12:05:11,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:11,610 INFO L225 Difference]: With dead ends: 338 [2021-05-06 12:05:11,610 INFO L226 Difference]: Without dead ends: 222 [2021-05-06 12:05:11,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 946.7ms TimeCoverageRelationStatistics Valid=168, Invalid=1238, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:11,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-06 12:05:11,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 205. [2021-05-06 12:05:11,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 190 states have (on average 1.2157894736842105) internal successors, (231), 193 states have internal predecessors, (231), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:11,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 248 transitions. [2021-05-06 12:05:11,657 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 248 transitions. Word has length 55 [2021-05-06 12:05:11,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:11,658 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 248 transitions. [2021-05-06 12:05:11,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 32 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:11,658 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 248 transitions. [2021-05-06 12:05:11,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 12:05:11,658 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:11,658 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:11,658 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable281 [2021-05-06 12:05:11,658 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:11,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:11,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1038279579, now seen corresponding path program 4 times [2021-05-06 12:05:11,659 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:11,659 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864216801] [2021-05-06 12:05:11,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:11,670 WARN L240 tifierPushTermWalker]: treesize reduction 92, result has 44.2 percent of original size [2021-05-06 12:05:11,708 WARN L245 tifierPushTermWalker]: treesize reduction 92, result has 44.2 percent of original size 73 [2021-05-06 12:05:11,734 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:11,740 WARN L240 tifierPushTermWalker]: treesize reduction 96, result has 45.1 percent of original size [2021-05-06 12:05:11,784 WARN L245 tifierPushTermWalker]: treesize reduction 96, result has 45.1 percent of original size 79 [2021-05-06 12:05:11,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:11,817 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:11,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:11,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:11,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:11,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:11,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:11,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:11,970 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:11,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864216801] [2021-05-06 12:05:11,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [864216801] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:11,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:11,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:05:11,971 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004005130] [2021-05-06 12:05:11,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:05:11,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:11,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:05:11,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:05:11,971 INFO L87 Difference]: Start difference. First operand 205 states and 248 transitions. Second operand has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:05:12,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:12,265 INFO L93 Difference]: Finished difference Result 392 states and 478 transitions. [2021-05-06 12:05:12,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:05:12,265 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2021-05-06 12:05:12,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:12,266 INFO L225 Difference]: With dead ends: 392 [2021-05-06 12:05:12,266 INFO L226 Difference]: Without dead ends: 278 [2021-05-06 12:05:12,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 190.9ms TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:05:12,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-05-06 12:05:12,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 223. [2021-05-06 12:05:12,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 208 states have (on average 1.2115384615384615) internal successors, (252), 211 states have internal predecessors, (252), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:12,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 269 transitions. [2021-05-06 12:05:12,314 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 269 transitions. Word has length 57 [2021-05-06 12:05:12,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:12,315 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 269 transitions. [2021-05-06 12:05:12,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:05:12,315 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 269 transitions. [2021-05-06 12:05:12,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:12,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:12,315 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:12,315 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable282 [2021-05-06 12:05:12,315 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:12,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:12,315 INFO L82 PathProgramCache]: Analyzing trace with hash -490608740, now seen corresponding path program 56 times [2021-05-06 12:05:12,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:12,316 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200291224] [2021-05-06 12:05:12,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:12,321 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:12,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,337 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:12,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:12,353 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:12,374 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:12,378 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:12,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:12,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:12,408 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:12,418 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:12,419 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:12,433 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:12,462 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,463 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:12,473 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:12,481 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:12,500 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:12,503 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:12,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:12,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:12,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:12,545 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:12,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:12,559 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:12,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:12,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:12,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:12,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:12,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:12,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:12,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:13,448 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:13,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200291224] [2021-05-06 12:05:13,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [200291224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:13,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:13,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:05:13,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406265903] [2021-05-06 12:05:13,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:05:13,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:13,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:05:13,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:05:13,449 INFO L87 Difference]: Start difference. First operand 223 states and 269 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:14,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:14,181 INFO L93 Difference]: Finished difference Result 392 states and 471 transitions. [2021-05-06 12:05:14,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:05:14,181 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:14,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:14,182 INFO L225 Difference]: With dead ends: 392 [2021-05-06 12:05:14,182 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 12:05:14,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 8 SyntacticMatches, 19 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 857.6ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:14,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 12:05:14,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 226. [2021-05-06 12:05:14,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:14,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:14,237 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:14,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:14,237 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:14,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:14,238 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:14,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:14,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:14,238 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:14,238 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable287 [2021-05-06 12:05:14,238 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:14,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:14,238 INFO L82 PathProgramCache]: Analyzing trace with hash -66962018, now seen corresponding path program 57 times [2021-05-06 12:05:14,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:14,239 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600308721] [2021-05-06 12:05:14,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:14,253 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:14,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:14,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:14,279 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:14,290 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:14,293 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:14,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,302 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,311 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:14,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:14,322 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:14,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:14,332 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:14,334 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:14,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:14,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:14,363 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:14,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:14,377 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:14,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:14,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:14,392 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:14,405 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:14,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:14,420 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:14,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:14,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:14,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:14,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:14,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:14,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:14,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:15,365 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:15,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600308721] [2021-05-06 12:05:15,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [600308721] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:15,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:15,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:05:15,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486125480] [2021-05-06 12:05:15,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:05:15,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:15,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:05:15,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:05:15,366 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:15,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:15,948 INFO L93 Difference]: Finished difference Result 395 states and 474 transitions. [2021-05-06 12:05:15,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:05:15,948 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:15,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:15,949 INFO L225 Difference]: With dead ends: 395 [2021-05-06 12:05:15,949 INFO L226 Difference]: Without dead ends: 272 [2021-05-06 12:05:15,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 899.8ms TimeCoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:15,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-05-06 12:05:16,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 226. [2021-05-06 12:05:16,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:16,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:16,009 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:16,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:16,009 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:16,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:16,009 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:16,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:16,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:16,010 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:16,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable292 [2021-05-06 12:05:16,010 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:16,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:16,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1096321316, now seen corresponding path program 58 times [2021-05-06 12:05:16,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:16,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418252832] [2021-05-06 12:05:16,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:16,016 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:16,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:16,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:16,048 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:16,058 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,061 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:16,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:16,074 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:16,087 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:16,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,096 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:16,100 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:16,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:16,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:16,126 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:16,136 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,139 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:16,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:16,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:16,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:16,166 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:16,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:16,176 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:16,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:16,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:16,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:16,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:16,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:16,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:17,036 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:17,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418252832] [2021-05-06 12:05:17,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1418252832] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:17,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:17,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:05:17,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957965265] [2021-05-06 12:05:17,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:05:17,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:17,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:05:17,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:17,037 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:17,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:17,626 INFO L93 Difference]: Finished difference Result 392 states and 471 transitions. [2021-05-06 12:05:17,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:05:17,627 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:17,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:17,628 INFO L225 Difference]: With dead ends: 392 [2021-05-06 12:05:17,628 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 12:05:17,628 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 831.1ms TimeCoverageRelationStatistics Valid=123, Invalid=869, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:17,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 12:05:17,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 226. [2021-05-06 12:05:17,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:17,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:17,689 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:17,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:17,689 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:17,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:17,689 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:17,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:17,689 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:17,689 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:17,689 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable297 [2021-05-06 12:05:17,689 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:17,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:17,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1940326818, now seen corresponding path program 59 times [2021-05-06 12:05:17,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:17,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820697215] [2021-05-06 12:05:17,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:17,696 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:17,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:17,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:17,724 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:17,736 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,738 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:17,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,748 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,758 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:17,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:17,768 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:17,777 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,778 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:17,780 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:17,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,789 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:17,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:17,810 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:17,822 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,825 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:17,825 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:17,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:17,853 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:17,863 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,864 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:17,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:17,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:17,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:17,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:18,745 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:18,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820697215] [2021-05-06 12:05:18,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [820697215] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:18,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:18,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:05:18,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868917654] [2021-05-06 12:05:18,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:05:18,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:18,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:05:18,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=810, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:18,746 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:19,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:19,335 INFO L93 Difference]: Finished difference Result 389 states and 468 transitions. [2021-05-06 12:05:19,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:05:19,335 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:19,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:19,336 INFO L225 Difference]: With dead ends: 389 [2021-05-06 12:05:19,337 INFO L226 Difference]: Without dead ends: 266 [2021-05-06 12:05:19,338 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 861.4ms TimeCoverageRelationStatistics Valid=130, Invalid=926, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:19,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-06 12:05:19,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 226. [2021-05-06 12:05:19,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:19,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:19,422 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:19,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:19,422 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:19,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:19,422 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:19,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:19,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:19,423 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:19,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable302 [2021-05-06 12:05:19,423 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:19,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:19,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1665567204, now seen corresponding path program 60 times [2021-05-06 12:05:19,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:19,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051638295] [2021-05-06 12:05:19,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:19,439 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:19,440 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:19,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:19,467 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:19,483 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:19,486 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:19,486 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:19,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:19,522 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:19,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:19,534 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:19,537 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:19,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:19,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:19,565 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:19,577 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:19,580 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:19,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:19,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:19,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:19,612 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:19,622 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:19,623 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:19,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:19,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:19,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:19,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:19,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:19,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:19,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:20,525 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:20,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051638295] [2021-05-06 12:05:20,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1051638295] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:20,526 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:20,526 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:05:20,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204125503] [2021-05-06 12:05:20,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:05:20,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:20,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:05:20,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:20,527 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:21,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:21,126 INFO L93 Difference]: Finished difference Result 386 states and 465 transitions. [2021-05-06 12:05:21,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:05:21,126 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:21,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:21,127 INFO L225 Difference]: With dead ends: 386 [2021-05-06 12:05:21,127 INFO L226 Difference]: Without dead ends: 263 [2021-05-06 12:05:21,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 7 SyntacticMatches, 16 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 876.1ms TimeCoverageRelationStatistics Valid=137, Invalid=985, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:21,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-05-06 12:05:21,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 226. [2021-05-06 12:05:21,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:21,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:21,196 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:21,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:21,196 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:21,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:21,196 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:21,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:21,196 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:21,196 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:21,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable307 [2021-05-06 12:05:21,196 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:21,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:21,197 INFO L82 PathProgramCache]: Analyzing trace with hash -279363810, now seen corresponding path program 61 times [2021-05-06 12:05:21,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:21,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064621710] [2021-05-06 12:05:21,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:21,207 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:21,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:21,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:21,236 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:21,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:21,250 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:21,251 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:21,279 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:21,294 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:21,304 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:21,304 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:21,306 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:21,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:21,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:21,334 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:21,346 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:21,349 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:21,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:21,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:21,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:21,379 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:21,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:21,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:21,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:21,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:21,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:21,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:21,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:21,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:21,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:22,329 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:22,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064621710] [2021-05-06 12:05:22,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1064621710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:22,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:22,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:05:22,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008589719] [2021-05-06 12:05:22,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:05:22,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:22,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:05:22,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=922, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:22,331 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:23,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:23,098 INFO L93 Difference]: Finished difference Result 383 states and 462 transitions. [2021-05-06 12:05:23,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:05:23,098 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:23,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:23,099 INFO L225 Difference]: With dead ends: 383 [2021-05-06 12:05:23,099 INFO L226 Difference]: Without dead ends: 260 [2021-05-06 12:05:23,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 7 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 896.1ms TimeCoverageRelationStatistics Valid=144, Invalid=1046, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:23,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-06 12:05:23,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 226. [2021-05-06 12:05:23,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:23,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:23,163 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:23,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:23,163 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:23,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:23,163 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:23,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:23,163 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:23,163 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:23,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable312 [2021-05-06 12:05:23,163 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:23,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:23,164 INFO L82 PathProgramCache]: Analyzing trace with hash -217324196, now seen corresponding path program 62 times [2021-05-06 12:05:23,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:23,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112851203] [2021-05-06 12:05:23,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:23,172 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:23,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:23,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:23,203 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:23,214 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:23,216 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:23,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:23,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:23,243 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:23,252 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:23,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:23,255 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:23,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:23,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:23,283 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:23,295 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:23,297 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:23,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:23,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:23,332 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:23,342 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:23,343 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:23,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:23,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:23,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:23,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:23,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:23,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:23,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:24,308 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:24,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112851203] [2021-05-06 12:05:24,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1112851203] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:24,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:24,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:05:24,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88981219] [2021-05-06 12:05:24,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:05:24,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:24,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:05:24,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:24,309 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 32 states, 32 states have (on average 1.625) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:25,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:25,017 INFO L93 Difference]: Finished difference Result 380 states and 459 transitions. [2021-05-06 12:05:25,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:05:25,018 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:25,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:25,018 INFO L225 Difference]: With dead ends: 380 [2021-05-06 12:05:25,018 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 12:05:25,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 928.4ms TimeCoverageRelationStatistics Valid=151, Invalid=1109, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:25,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 12:05:25,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 226. [2021-05-06 12:05:25,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:25,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:25,082 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:25,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:25,083 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:25,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:25,083 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:25,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:25,083 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:25,083 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:25,083 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable317 [2021-05-06 12:05:25,083 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:25,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:25,083 INFO L82 PathProgramCache]: Analyzing trace with hash -2022762530, now seen corresponding path program 63 times [2021-05-06 12:05:25,084 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:25,084 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686947916] [2021-05-06 12:05:25,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:25,091 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:25,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:25,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:25,120 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:25,132 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:25,134 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:25,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:25,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:25,164 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:25,173 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:25,174 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:25,176 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:25,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:25,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:25,203 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:25,215 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:25,222 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:25,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:25,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:25,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:25,250 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:25,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:25,261 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:25,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:25,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:25,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:25,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:25,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:25,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:25,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:26,253 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:26,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686947916] [2021-05-06 12:05:26,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [686947916] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:26,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:26,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:05:26,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039448258] [2021-05-06 12:05:26,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:05:26,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:26,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:05:26,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1042, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:26,254 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 33 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 31 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:26,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:26,877 INFO L93 Difference]: Finished difference Result 377 states and 456 transitions. [2021-05-06 12:05:26,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:05:26,877 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 31 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:26,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:26,878 INFO L225 Difference]: With dead ends: 377 [2021-05-06 12:05:26,878 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 12:05:26,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 8 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 960.4ms TimeCoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:26,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 12:05:26,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 226. [2021-05-06 12:05:26,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:26,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:26,947 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:26,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:26,947 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:26,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 31 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:26,947 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:26,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:26,947 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:26,947 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:26,948 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable322 [2021-05-06 12:05:26,948 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:26,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:26,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1454556316, now seen corresponding path program 64 times [2021-05-06 12:05:26,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:26,948 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791646168] [2021-05-06 12:05:26,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:26,958 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:26,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:26,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:26,986 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:26,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:27,000 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:27,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:27,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:27,028 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:27,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:27,039 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:27,041 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:27,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:27,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:27,069 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:27,081 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:27,084 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:27,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:27,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:27,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:27,112 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:27,122 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:27,122 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:27,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:27,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:27,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:27,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:27,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:27,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:27,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:28,125 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:28,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791646168] [2021-05-06 12:05:28,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [791646168] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:28,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:28,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:05:28,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339018717] [2021-05-06 12:05:28,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:05:28,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:28,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:05:28,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1105, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:28,126 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 34 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:28,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:28,928 INFO L93 Difference]: Finished difference Result 374 states and 453 transitions. [2021-05-06 12:05:28,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:05:28,928 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:28,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:28,929 INFO L225 Difference]: With dead ends: 374 [2021-05-06 12:05:28,929 INFO L226 Difference]: Without dead ends: 251 [2021-05-06 12:05:28,929 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 954.7ms TimeCoverageRelationStatistics Valid=165, Invalid=1241, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:28,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-05-06 12:05:28,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 226. [2021-05-06 12:05:28,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:28,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:28,996 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:28,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:28,996 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:28,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:28,997 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:28,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:28,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:28,997 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:28,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable327 [2021-05-06 12:05:28,997 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:28,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:28,997 INFO L82 PathProgramCache]: Analyzing trace with hash -133791586, now seen corresponding path program 65 times [2021-05-06 12:05:28,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:28,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112042979] [2021-05-06 12:05:28,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:29,004 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:29,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:29,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:29,046 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:29,059 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:29,062 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:29,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:29,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:29,094 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:29,105 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:29,106 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:29,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:29,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:29,133 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:29,141 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:29,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:29,157 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:29,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:29,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:29,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:29,192 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:29,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:29,204 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:29,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:29,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:29,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:29,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:29,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:29,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:29,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:30,158 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:30,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112042979] [2021-05-06 12:05:30,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1112042979] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:30,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:30,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:05:30,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277526202] [2021-05-06 12:05:30,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:05:30,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:30,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:05:30,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:30,159 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 33 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:30,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:30,810 INFO L93 Difference]: Finished difference Result 372 states and 451 transitions. [2021-05-06 12:05:30,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:05:30,810 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 33 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:30,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:30,811 INFO L225 Difference]: With dead ends: 372 [2021-05-06 12:05:30,811 INFO L226 Difference]: Without dead ends: 249 [2021-05-06 12:05:30,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 7 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 926.5ms TimeCoverageRelationStatistics Valid=172, Invalid=1310, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:05:30,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-05-06 12:05:30,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 226. [2021-05-06 12:05:30,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.2085308056872037) internal successors, (255), 214 states have internal predecessors, (255), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:30,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2021-05-06 12:05:30,890 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 58 [2021-05-06 12:05:30,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:30,891 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2021-05-06 12:05:30,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 33 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:30,891 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2021-05-06 12:05:30,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:05:30,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:30,891 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:30,891 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable332 [2021-05-06 12:05:30,891 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:30,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:30,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1144908836, now seen corresponding path program 66 times [2021-05-06 12:05:30,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:30,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921652871] [2021-05-06 12:05:30,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:30,897 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:30,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:30,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:30,933 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:30,945 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:30,952 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:30,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:30,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:30,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:30,983 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:30,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:30,996 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:30,998 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:31,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:31,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:31,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:31,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:31,028 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:31,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:31,039 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:31,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:31,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:31,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:31,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:31,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:31,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:31,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:32,019 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:32,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921652871] [2021-05-06 12:05:32,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [921652871] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:32,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:32,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:05:32,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994994030] [2021-05-06 12:05:32,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:05:32,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:32,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:05:32,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1237, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:32,020 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 36 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 34 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:33,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:33,061 INFO L93 Difference]: Finished difference Result 383 states and 466 transitions. [2021-05-06 12:05:33,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:05:33,062 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 34 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 12:05:33,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:33,062 INFO L225 Difference]: With dead ends: 383 [2021-05-06 12:05:33,062 INFO L226 Difference]: Without dead ends: 249 [2021-05-06 12:05:33,063 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 951.0ms TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:05:33,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-05-06 12:05:33,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 229. [2021-05-06 12:05:33,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2102803738317758) internal successors, (259), 217 states have internal predecessors, (259), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:33,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 276 transitions. [2021-05-06 12:05:33,127 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 276 transitions. Word has length 58 [2021-05-06 12:05:33,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:33,127 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 276 transitions. [2021-05-06 12:05:33,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 34 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:33,128 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 276 transitions. [2021-05-06 12:05:33,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:33,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:33,128 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:33,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable336 [2021-05-06 12:05:33,128 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:33,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:33,128 INFO L82 PathProgramCache]: Analyzing trace with hash 831909855, now seen corresponding path program 67 times [2021-05-06 12:05:33,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:33,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502122546] [2021-05-06 12:05:33,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:33,141 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:33,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:33,163 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:33,171 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:33,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:33,188 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:33,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:33,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:33,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:33,229 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:33,230 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:33,232 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:33,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,234 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:33,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:33,259 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:33,271 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:33,273 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:33,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:33,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:33,300 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:33,310 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:33,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:33,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:33,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:33,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:33,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:33,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:33,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:33,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:34,265 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:34,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502122546] [2021-05-06 12:05:34,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1502122546] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:34,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:34,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:05:34,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951309901] [2021-05-06 12:05:34,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:05:34,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:34,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:05:34,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:05:34,267 INFO L87 Difference]: Start difference. First operand 229 states and 276 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:35,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:35,052 INFO L93 Difference]: Finished difference Result 401 states and 481 transitions. [2021-05-06 12:05:35,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:05:35,053 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:35,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:35,054 INFO L225 Difference]: With dead ends: 401 [2021-05-06 12:05:35,054 INFO L226 Difference]: Without dead ends: 278 [2021-05-06 12:05:35,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 7 SyntacticMatches, 22 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 916.8ms TimeCoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:35,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-05-06 12:05:35,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 232. [2021-05-06 12:05:35,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:35,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:35,130 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:35,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:35,130 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:35,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:35,130 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:35,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:35,131 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:35,131 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:35,131 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable341 [2021-05-06 12:05:35,131 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:35,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:35,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1217477987, now seen corresponding path program 68 times [2021-05-06 12:05:35,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:35,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615394319] [2021-05-06 12:05:35,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:35,137 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:35,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:35,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:35,165 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:35,177 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:35,184 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:35,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:35,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:35,222 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:35,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:35,233 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:35,235 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:35,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:35,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:35,268 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:35,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:35,285 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:35,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:35,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:35,317 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:35,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:35,330 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:35,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:35,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:35,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:35,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:35,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:35,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:35,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:36,292 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:36,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615394319] [2021-05-06 12:05:36,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [615394319] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:36,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:36,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:05:36,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912272135] [2021-05-06 12:05:36,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:05:36,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:36,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:05:36,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:05:36,293 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:37,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:37,065 INFO L93 Difference]: Finished difference Result 404 states and 484 transitions. [2021-05-06 12:05:37,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:05:37,065 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:37,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:37,066 INFO L225 Difference]: With dead ends: 404 [2021-05-06 12:05:37,066 INFO L226 Difference]: Without dead ends: 281 [2021-05-06 12:05:37,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 928.5ms TimeCoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:37,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-05-06 12:05:37,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 232. [2021-05-06 12:05:37,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:37,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:37,146 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:37,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:37,146 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:37,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:37,146 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:37,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:37,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:37,146 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:37,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable346 [2021-05-06 12:05:37,147 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:37,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:37,147 INFO L82 PathProgramCache]: Analyzing trace with hash -793831265, now seen corresponding path program 69 times [2021-05-06 12:05:37,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:37,147 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843580172] [2021-05-06 12:05:37,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:37,153 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:37,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:37,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:37,203 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:37,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,219 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:37,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:37,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:37,250 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:37,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,261 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:37,263 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:37,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:37,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:37,293 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:37,304 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,307 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:37,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:37,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:37,341 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:37,351 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,352 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:37,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:37,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:37,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:37,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:37,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:37,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:37,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:38,364 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:38,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843580172] [2021-05-06 12:05:38,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [843580172] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:38,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:38,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:05:38,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798600409] [2021-05-06 12:05:38,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:05:38,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:38,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:05:38,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=813, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:05:38,366 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:39,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:39,190 INFO L93 Difference]: Finished difference Result 401 states and 481 transitions. [2021-05-06 12:05:39,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:05:39,190 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:39,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:39,191 INFO L225 Difference]: With dead ends: 401 [2021-05-06 12:05:39,191 INFO L226 Difference]: Without dead ends: 278 [2021-05-06 12:05:39,191 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 976.9ms TimeCoverageRelationStatistics Valid=127, Invalid=929, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:39,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-05-06 12:05:39,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 232. [2021-05-06 12:05:39,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:39,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:39,282 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:39,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:39,282 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:39,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:39,282 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:39,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:39,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:39,283 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:39,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable351 [2021-05-06 12:05:39,283 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:39,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:39,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1823190563, now seen corresponding path program 70 times [2021-05-06 12:05:39,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:39,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778426447] [2021-05-06 12:05:39,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:39,289 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:39,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:39,300 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:39,322 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:39,334 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:39,337 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:39,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:39,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:39,366 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:39,376 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:39,377 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:39,379 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:39,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:39,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:39,406 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:39,418 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:39,420 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:39,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:39,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:39,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:39,449 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:39,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:39,460 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:39,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:39,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:39,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:39,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:39,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:39,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:39,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:40,421 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:40,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778426447] [2021-05-06 12:05:40,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [778426447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:40,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:40,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:05:40,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025754924] [2021-05-06 12:05:40,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:05:40,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:40,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:05:40,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:05:40,423 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:41,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:41,184 INFO L93 Difference]: Finished difference Result 398 states and 478 transitions. [2021-05-06 12:05:41,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:05:41,184 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:41,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:41,185 INFO L225 Difference]: With dead ends: 398 [2021-05-06 12:05:41,185 INFO L226 Difference]: Without dead ends: 275 [2021-05-06 12:05:41,185 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 8 SyntacticMatches, 18 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 922.8ms TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:41,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-05-06 12:05:41,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 232. [2021-05-06 12:05:41,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:41,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:41,268 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:41,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:41,268 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:41,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:41,268 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:41,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:41,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:41,269 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:41,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable356 [2021-05-06 12:05:41,269 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:41,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:41,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1627771231, now seen corresponding path program 71 times [2021-05-06 12:05:41,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:41,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665436542] [2021-05-06 12:05:41,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:41,279 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:41,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,286 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:41,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:41,313 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:41,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,330 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:41,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:41,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:41,360 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:41,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,371 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:41,373 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:41,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:41,397 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:41,405 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:41,417 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,420 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:41,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:41,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:41,451 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:41,461 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,462 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:41,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:41,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:41,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:41,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:41,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:41,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:41,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:42,403 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:42,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665436542] [2021-05-06 12:05:42,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1665436542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:42,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:42,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:05:42,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705921118] [2021-05-06 12:05:42,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:05:42,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:42,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:05:42,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=925, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:05:42,404 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:43,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:43,159 INFO L93 Difference]: Finished difference Result 395 states and 475 transitions. [2021-05-06 12:05:43,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:05:43,160 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:43,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:43,160 INFO L225 Difference]: With dead ends: 395 [2021-05-06 12:05:43,160 INFO L226 Difference]: Without dead ends: 272 [2021-05-06 12:05:43,161 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 8 SyntacticMatches, 17 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 892.8ms TimeCoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:43,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-05-06 12:05:43,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 232. [2021-05-06 12:05:43,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:43,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:43,246 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:43,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:43,246 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:43,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:43,246 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:43,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:43,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:43,246 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:43,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable361 [2021-05-06 12:05:43,246 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:43,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:43,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1902530845, now seen corresponding path program 72 times [2021-05-06 12:05:43,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:43,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642554226] [2021-05-06 12:05:43,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:43,253 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:43,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:43,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:43,282 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:43,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,297 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:43,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:43,311 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:43,327 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:43,337 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,338 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:43,341 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:43,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,354 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:43,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:43,373 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:43,384 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,388 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:43,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:43,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:43,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:43,429 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:43,439 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:43,440 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:43,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:43,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:43,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:43,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:43,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:43,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:43,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:44,403 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:44,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642554226] [2021-05-06 12:05:44,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [642554226] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:44,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:44,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:05:44,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273945679] [2021-05-06 12:05:44,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:05:44,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:44,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:05:44,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:05:44,404 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:45,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:45,301 INFO L93 Difference]: Finished difference Result 392 states and 472 transitions. [2021-05-06 12:05:45,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:05:45,301 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:45,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:45,302 INFO L225 Difference]: With dead ends: 392 [2021-05-06 12:05:45,302 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 12:05:45,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 7 SyntacticMatches, 17 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 937.5ms TimeCoverageRelationStatistics Valid=148, Invalid=1112, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:45,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 12:05:45,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 232. [2021-05-06 12:05:45,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:45,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:45,387 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:45,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:45,387 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:45,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:45,387 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:45,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:45,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:45,388 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:45,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable366 [2021-05-06 12:05:45,388 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:45,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:45,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1006233057, now seen corresponding path program 73 times [2021-05-06 12:05:45,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:45,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204874273] [2021-05-06 12:05:45,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:45,398 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:45,398 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:45,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:45,425 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:45,436 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:45,439 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:45,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,462 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:45,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:45,489 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:45,500 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:45,501 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:45,503 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:45,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:45,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:45,530 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:45,542 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:45,545 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:45,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:45,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:45,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:45,576 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:45,586 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:45,586 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:45,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:45,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:45,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:45,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:45,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:45,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:45,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:46,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:46,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204874273] [2021-05-06 12:05:46,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [204874273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:46,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:46,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:05:46,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441843868] [2021-05-06 12:05:46,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:05:46,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:46,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:05:46,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1045, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:05:46,582 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:47,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:47,342 INFO L93 Difference]: Finished difference Result 389 states and 469 transitions. [2021-05-06 12:05:47,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:05:47,342 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:47,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:47,343 INFO L225 Difference]: With dead ends: 389 [2021-05-06 12:05:47,343 INFO L226 Difference]: Without dead ends: 266 [2021-05-06 12:05:47,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 965.3ms TimeCoverageRelationStatistics Valid=155, Invalid=1177, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:47,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-06 12:05:47,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 232. [2021-05-06 12:05:47,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:47,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:47,430 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:47,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:47,431 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:47,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:47,431 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:47,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:47,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:47,431 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:47,431 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable371 [2021-05-06 12:05:47,431 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:47,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:47,432 INFO L82 PathProgramCache]: Analyzing trace with hash -944193443, now seen corresponding path program 74 times [2021-05-06 12:05:47,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:47,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268938793] [2021-05-06 12:05:47,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:47,438 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:47,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:47,449 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:47,466 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:47,478 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,480 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:47,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:47,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:47,510 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:47,520 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,521 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:47,523 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:47,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:47,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:47,563 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:47,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,578 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:47,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:47,597 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:47,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:47,608 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:47,618 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:47,619 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:47,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:47,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:47,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:47,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:47,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:47,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:47,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:48,629 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:48,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268938793] [2021-05-06 12:05:48,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [268938793] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:48,630 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:48,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:05:48,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332330039] [2021-05-06 12:05:48,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:05:48,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:48,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:05:48,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1108, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:05:48,630 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:49,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:49,485 INFO L93 Difference]: Finished difference Result 386 states and 466 transitions. [2021-05-06 12:05:49,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:05:49,486 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:49,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:49,487 INFO L225 Difference]: With dead ends: 386 [2021-05-06 12:05:49,487 INFO L226 Difference]: Without dead ends: 263 [2021-05-06 12:05:49,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 976.5ms TimeCoverageRelationStatistics Valid=162, Invalid=1244, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:49,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-05-06 12:05:49,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 232. [2021-05-06 12:05:49,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:49,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:49,582 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:49,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:49,582 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:49,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:49,582 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:49,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:49,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:49,583 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:49,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable376 [2021-05-06 12:05:49,583 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:49,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:49,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1545335519, now seen corresponding path program 75 times [2021-05-06 12:05:49,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:49,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182571219] [2021-05-06 12:05:49,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:49,589 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:49,590 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:49,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:49,630 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:49,642 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,645 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:49,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:49,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:49,674 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:49,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,686 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:49,688 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:49,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:49,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:49,716 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:49,729 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,731 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:49,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:49,742 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:49,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:49,760 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:49,770 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:49,771 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:49,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:49,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:49,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:49,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:49,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:49,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:49,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:50,852 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:50,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182571219] [2021-05-06 12:05:50,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [182571219] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:50,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:50,852 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:05:50,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448092562] [2021-05-06 12:05:50,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:05:50,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:50,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:05:50,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:50,853 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 35 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:51,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:51,780 INFO L93 Difference]: Finished difference Result 383 states and 463 transitions. [2021-05-06 12:05:51,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:05:51,780 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:51,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:51,781 INFO L225 Difference]: With dead ends: 383 [2021-05-06 12:05:51,781 INFO L226 Difference]: Without dead ends: 260 [2021-05-06 12:05:51,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1050.7ms TimeCoverageRelationStatistics Valid=169, Invalid=1313, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:05:51,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-06 12:05:51,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 232. [2021-05-06 12:05:51,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:51,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:51,867 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:51,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:51,867 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:51,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:51,867 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:51,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:51,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:51,867 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:51,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable381 [2021-05-06 12:05:51,867 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:51,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:51,868 INFO L82 PathProgramCache]: Analyzing trace with hash 727687069, now seen corresponding path program 76 times [2021-05-06 12:05:51,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:51,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896717443] [2021-05-06 12:05:51,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:51,874 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:51,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,891 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:51,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:51,908 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:51,920 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:51,922 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:51,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:51,938 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:51,952 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:51,963 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:51,964 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:51,966 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:51,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:51,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:51,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:51,994 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:52,015 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:52,017 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:52,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:52,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:52,047 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:52,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:52,058 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:52,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:52,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:52,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:52,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:52,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:52,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:52,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:53,032 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:53,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896717443] [2021-05-06 12:05:53,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [896717443] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:53,032 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:53,032 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:05:53,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911095756] [2021-05-06 12:05:53,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:05:53,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:53,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:05:53,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1240, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:05:53,033 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 34 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:53,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:53,776 INFO L93 Difference]: Finished difference Result 380 states and 460 transitions. [2021-05-06 12:05:53,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:05:53,777 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 34 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:53,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:53,778 INFO L225 Difference]: With dead ends: 380 [2021-05-06 12:05:53,778 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 12:05:53,778 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 8 SyntacticMatches, 12 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 501 ImplicationChecksByTransitivity, 950.8ms TimeCoverageRelationStatistics Valid=176, Invalid=1384, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:05:53,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 12:05:53,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 232. [2021-05-06 12:05:53,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:53,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:53,865 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:53,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:53,865 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:53,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 34 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:53,865 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:53,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:53,865 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:53,865 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:53,865 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable386 [2021-05-06 12:05:53,865 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:53,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:53,866 INFO L82 PathProgramCache]: Analyzing trace with hash -860660833, now seen corresponding path program 77 times [2021-05-06 12:05:53,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:53,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363370543] [2021-05-06 12:05:53,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:53,871 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:53,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,873 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:53,883 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:53,901 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:53,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:53,916 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:53,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:53,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:53,944 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:53,954 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:53,954 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:53,956 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:53,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:53,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:53,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:53,986 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:53,998 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:54,001 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:54,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:54,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:54,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:54,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:54,030 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:54,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:54,044 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:54,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:54,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:54,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:54,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:54,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:54,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:54,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:55,157 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:55,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363370543] [2021-05-06 12:05:55,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1363370543] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:55,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:55,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:05:55,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936452312] [2021-05-06 12:05:55,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:05:55,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:55,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:05:55,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1309, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:05:55,158 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 37 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 35 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:55,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:55,879 INFO L93 Difference]: Finished difference Result 378 states and 458 transitions. [2021-05-06 12:05:55,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:05:55,879 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 35 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:55,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:55,880 INFO L225 Difference]: With dead ends: 378 [2021-05-06 12:05:55,880 INFO L226 Difference]: Without dead ends: 255 [2021-05-06 12:05:55,881 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1082.6ms TimeCoverageRelationStatistics Valid=183, Invalid=1457, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:05:55,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-05-06 12:05:55,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 232. [2021-05-06 12:05:55,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.207373271889401) internal successors, (262), 220 states have internal predecessors, (262), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:55,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 279 transitions. [2021-05-06 12:05:55,967 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 279 transitions. Word has length 61 [2021-05-06 12:05:55,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:55,967 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 279 transitions. [2021-05-06 12:05:55,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 35 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:55,967 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 279 transitions. [2021-05-06 12:05:55,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:05:55,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:55,968 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:55,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable391 [2021-05-06 12:05:55,968 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:55,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:55,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1871778083, now seen corresponding path program 78 times [2021-05-06 12:05:55,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:55,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253090122] [2021-05-06 12:05:55,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:55,973 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:55,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:55,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:56,005 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:56,017 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:56,019 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:56,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,030 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:56,042 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:56,049 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:56,059 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:56,059 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:56,061 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:56,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:56,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:56,095 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:56,105 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:56,106 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:56,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:56,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:56,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:56,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:56,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:56,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:56,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:57,205 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:57,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253090122] [2021-05-06 12:05:57,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1253090122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:57,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:57,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:05:57,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170059905] [2021-05-06 12:05:57,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:05:57,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:57,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:05:57,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:05:57,206 INFO L87 Difference]: Start difference. First operand 232 states and 279 transitions. Second operand has 38 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 36 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:58,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:58,134 INFO L93 Difference]: Finished difference Result 389 states and 473 transitions. [2021-05-06 12:05:58,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:05:58,134 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 36 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 12:05:58,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:58,135 INFO L225 Difference]: With dead ends: 389 [2021-05-06 12:05:58,135 INFO L226 Difference]: Without dead ends: 255 [2021-05-06 12:05:58,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1074.1ms TimeCoverageRelationStatistics Valid=190, Invalid=1532, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:05:58,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-05-06 12:05:58,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 235. [2021-05-06 12:05:58,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 220 states have (on average 1.209090909090909) internal successors, (266), 223 states have internal predecessors, (266), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:58,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 283 transitions. [2021-05-06 12:05:58,226 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 283 transitions. Word has length 61 [2021-05-06 12:05:58,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:58,226 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 283 transitions. [2021-05-06 12:05:58,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 36 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:58,226 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 283 transitions. [2021-05-06 12:05:58,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 12:05:58,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:58,227 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:58,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable395 [2021-05-06 12:05:58,227 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:58,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:58,227 INFO L82 PathProgramCache]: Analyzing trace with hash -970422987, now seen corresponding path program 5 times [2021-05-06 12:05:58,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:58,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219629249] [2021-05-06 12:05:58,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:58,237 WARN L240 tifierPushTermWalker]: treesize reduction 58, result has 57.7 percent of original size [2021-05-06 12:05:58,281 WARN L245 tifierPushTermWalker]: treesize reduction 58, result has 57.7 percent of original size 79 [2021-05-06 12:05:58,307 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,315 WARN L240 tifierPushTermWalker]: treesize reduction 54, result has 57.5 percent of original size [2021-05-06 12:05:58,354 WARN L245 tifierPushTermWalker]: treesize reduction 54, result has 57.5 percent of original size 73 [2021-05-06 12:05:58,384 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,385 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:58,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:58,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:58,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:58,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:58,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:58,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:58,590 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:58,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219629249] [2021-05-06 12:05:58,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [219629249] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:58,591 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:58,591 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:05:58,591 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933946607] [2021-05-06 12:05:58,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:05:58,591 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:58,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:05:58,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:05:58,591 INFO L87 Difference]: Start difference. First operand 235 states and 283 transitions. Second operand has 17 states, 17 states have (on average 3.0) internal successors, (51), 16 states have internal predecessors, (51), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:05:58,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:58,971 INFO L93 Difference]: Finished difference Result 452 states and 546 transitions. [2021-05-06 12:05:58,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:05:58,972 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0) internal successors, (51), 16 states have internal predecessors, (51), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 63 [2021-05-06 12:05:58,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:58,973 INFO L225 Difference]: With dead ends: 452 [2021-05-06 12:05:58,973 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 12:05:58,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 25 SyntacticMatches, 9 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 233.1ms TimeCoverageRelationStatistics Valid=155, Invalid=351, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:05:58,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 12:05:59,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 253. [2021-05-06 12:05:59,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 238 states have (on average 1.2058823529411764) internal successors, (287), 241 states have internal predecessors, (287), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:05:59,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 304 transitions. [2021-05-06 12:05:59,065 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 304 transitions. Word has length 63 [2021-05-06 12:05:59,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:59,065 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 304 transitions. [2021-05-06 12:05:59,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0) internal successors, (51), 16 states have internal predecessors, (51), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:05:59,065 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 304 transitions. [2021-05-06 12:05:59,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:05:59,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:59,066 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:59,066 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable396 [2021-05-06 12:05:59,066 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:59,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:59,066 INFO L82 PathProgramCache]: Analyzing trace with hash -2046600004, now seen corresponding path program 79 times [2021-05-06 12:05:59,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:59,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577551960] [2021-05-06 12:05:59,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:59,072 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:05:59,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:59,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:59,101 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:05:59,113 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,116 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:05:59,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:59,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:59,147 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:05:59,158 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,158 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:59,161 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:05:59,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:59,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:59,195 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:05:59,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,210 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:05:59,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:05:59,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:05:59,240 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:05:59,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,251 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:59,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:59,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:59,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:59,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:05:59,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:59,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:59,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:00,269 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:00,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577551960] [2021-05-06 12:06:00,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1577551960] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:00,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:00,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:06:00,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910745662] [2021-05-06 12:06:00,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:06:00,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:00,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:06:00,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:06:00,270 INFO L87 Difference]: Start difference. First operand 253 states and 304 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:01,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:01,246 INFO L93 Difference]: Finished difference Result 449 states and 536 transitions. [2021-05-06 12:06:01,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:06:01,246 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:01,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:01,247 INFO L225 Difference]: With dead ends: 449 [2021-05-06 12:06:01,247 INFO L226 Difference]: Without dead ends: 308 [2021-05-06 12:06:01,247 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 24 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 990.2ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:01,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-06 12:06:01,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 256. [2021-05-06 12:06:01,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:01,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:01,349 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:01,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:01,349 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:01,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:01,349 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:01,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:01,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:01,350 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:01,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable401 [2021-05-06 12:06:01,350 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:01,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:01,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1895278910, now seen corresponding path program 80 times [2021-05-06 12:06:01,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:01,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99070706] [2021-05-06 12:06:01,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:01,370 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:01,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:01,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:01,403 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:01,418 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,420 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:01,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:01,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:01,458 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:01,470 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,470 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:01,473 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:01,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:01,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:01,500 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:01,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,514 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:01,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,516 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:01,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:01,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:01,542 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:01,552 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:01,552 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:01,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:01,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:01,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:01,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:01,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:01,650 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:01,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:02,517 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:02,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99070706] [2021-05-06 12:06:02,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [99070706] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:02,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:02,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:06:02,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775332764] [2021-05-06 12:06:02,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:06:02,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:02,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:06:02,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:06:02,518 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:03,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:03,326 INFO L93 Difference]: Finished difference Result 452 states and 539 transitions. [2021-05-06 12:06:03,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:06:03,326 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:03,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:03,327 INFO L225 Difference]: With dead ends: 452 [2021-05-06 12:06:03,327 INFO L226 Difference]: Without dead ends: 311 [2021-05-06 12:06:03,328 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 940.9ms TimeCoverageRelationStatistics Valid=124, Invalid=932, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:03,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-06 12:06:03,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 256. [2021-05-06 12:06:03,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:03,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:03,435 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:03,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:03,435 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:03,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:03,435 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:03,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:03,435 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:03,435 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:03,435 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable406 [2021-05-06 12:06:03,435 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:03,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:03,436 INFO L82 PathProgramCache]: Analyzing trace with hash -154108932, now seen corresponding path program 81 times [2021-05-06 12:06:03,436 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:03,436 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127938063] [2021-05-06 12:06:03,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:03,443 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:03,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:03,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:03,473 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:03,485 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,487 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:03,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:03,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:03,520 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:03,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,531 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:03,533 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:03,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:03,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:03,562 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:03,574 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,576 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:03,585 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,595 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:03,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:03,604 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:03,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:03,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:03,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:03,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:03,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:04,602 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:04,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127938063] [2021-05-06 12:06:04,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1127938063] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:04,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:04,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:06:04,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721220746] [2021-05-06 12:06:04,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:06:04,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:04,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:06:04,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:04,603 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:05,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:05,429 INFO L93 Difference]: Finished difference Result 449 states and 536 transitions. [2021-05-06 12:06:05,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:06:05,429 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:05,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:05,430 INFO L225 Difference]: With dead ends: 449 [2021-05-06 12:06:05,430 INFO L226 Difference]: Without dead ends: 308 [2021-05-06 12:06:05,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 957.9ms TimeCoverageRelationStatistics Valid=131, Invalid=991, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:05,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-06 12:06:05,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 256. [2021-05-06 12:06:05,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:05,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:05,541 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:05,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:05,541 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:05,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:05,541 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:05,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:05,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:05,542 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:05,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable411 [2021-05-06 12:06:05,542 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:05,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:05,542 INFO L82 PathProgramCache]: Analyzing trace with hash 269537790, now seen corresponding path program 82 times [2021-05-06 12:06:05,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:05,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383651317] [2021-05-06 12:06:05,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:05,553 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:05,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:05,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:05,588 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:05,600 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:05,602 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:05,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:05,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:05,630 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:05,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:05,641 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:05,643 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:05,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:05,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:05,670 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:05,682 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:05,685 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:05,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:05,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:05,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:05,713 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:05,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:05,723 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:05,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:05,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:05,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:05,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:05,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:05,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:05,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:06,742 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:06,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383651317] [2021-05-06 12:06:06,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1383651317] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:06,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:06,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:06:06,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582396754] [2021-05-06 12:06:06,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:06:06,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:06,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:06:06,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=928, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:06,744 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:07,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:07,671 INFO L93 Difference]: Finished difference Result 446 states and 533 transitions. [2021-05-06 12:06:07,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:06:07,671 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:07,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:07,672 INFO L225 Difference]: With dead ends: 446 [2021-05-06 12:06:07,672 INFO L226 Difference]: Without dead ends: 305 [2021-05-06 12:06:07,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 984.8ms TimeCoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:07,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-05-06 12:06:07,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 256. [2021-05-06 12:06:07,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:07,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:07,784 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:07,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:07,785 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:07,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:07,785 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:07,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:07,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:07,785 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:07,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable416 [2021-05-06 12:06:07,785 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:07,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:07,785 INFO L82 PathProgramCache]: Analyzing trace with hash -759821508, now seen corresponding path program 83 times [2021-05-06 12:06:07,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:07,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546539124] [2021-05-06 12:06:07,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:07,791 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:07,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:07,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:07,832 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:07,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:07,851 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:07,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:07,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:07,882 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:07,892 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:07,893 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:07,897 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:07,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:07,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:07,928 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:07,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:07,947 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:07,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:07,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:07,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:07,975 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:07,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:07,987 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:07,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:08,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:08,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:08,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:09,054 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:09,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546539124] [2021-05-06 12:06:09,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [546539124] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:09,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:09,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:06:09,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291633070] [2021-05-06 12:06:09,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:06:09,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:09,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:06:09,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:09,055 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 32 states, 32 states have (on average 1.8125) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:10,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:10,029 INFO L93 Difference]: Finished difference Result 443 states and 530 transitions. [2021-05-06 12:06:10,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:06:10,029 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:10,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:10,030 INFO L225 Difference]: With dead ends: 443 [2021-05-06 12:06:10,030 INFO L226 Difference]: Without dead ends: 302 [2021-05-06 12:06:10,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1014.7ms TimeCoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:10,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-06 12:06:10,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 256. [2021-05-06 12:06:10,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:10,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:10,145 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:10,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:10,145 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:10,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:10,145 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:10,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:10,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:10,146 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:10,146 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable421 [2021-05-06 12:06:10,146 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:10,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:10,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1603827010, now seen corresponding path program 84 times [2021-05-06 12:06:10,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:10,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595514787] [2021-05-06 12:06:10,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:10,152 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:10,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:10,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:10,182 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:10,194 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:10,197 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:10,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:10,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:10,224 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:10,239 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:10,240 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:10,242 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:10,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:10,267 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:10,275 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:10,288 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:10,290 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:10,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:10,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:10,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:10,324 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:10,336 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:10,337 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:10,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:10,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:10,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:10,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:10,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:10,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:10,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:11,386 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:11,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595514787] [2021-05-06 12:06:11,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [595514787] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:11,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:11,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:06:11,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218284656] [2021-05-06 12:06:11,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:06:11,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:11,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:06:11,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1048, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:11,387 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:12,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:12,198 INFO L93 Difference]: Finished difference Result 440 states and 527 transitions. [2021-05-06 12:06:12,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:06:12,198 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:12,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:12,200 INFO L225 Difference]: With dead ends: 440 [2021-05-06 12:06:12,200 INFO L226 Difference]: Without dead ends: 299 [2021-05-06 12:06:12,200 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 1027.7ms TimeCoverageRelationStatistics Valid=152, Invalid=1180, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:12,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-05-06 12:06:12,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 256. [2021-05-06 12:06:12,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:12,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:12,316 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:12,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:12,316 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:12,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:12,316 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:12,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:12,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:12,316 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:12,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable426 [2021-05-06 12:06:12,316 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:12,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:12,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1329067396, now seen corresponding path program 85 times [2021-05-06 12:06:12,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:12,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053981038] [2021-05-06 12:06:12,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:12,322 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:12,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:12,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:12,352 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:12,364 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:12,366 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:12,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:12,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:12,395 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:12,405 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:12,406 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:12,408 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:12,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:12,439 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:12,446 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:12,458 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:12,460 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:12,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:12,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:12,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:12,489 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:12,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:12,500 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:12,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:12,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:12,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:12,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:12,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:12,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:12,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:13,536 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:13,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053981038] [2021-05-06 12:06:13,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1053981038] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:13,537 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:13,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:06:13,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517851397] [2021-05-06 12:06:13,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:06:13,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:13,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:06:13,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:13,538 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:14,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:14,670 INFO L93 Difference]: Finished difference Result 437 states and 524 transitions. [2021-05-06 12:06:14,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:06:14,670 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:14,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:14,671 INFO L225 Difference]: With dead ends: 437 [2021-05-06 12:06:14,671 INFO L226 Difference]: Without dead ends: 296 [2021-05-06 12:06:14,672 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 1010.3ms TimeCoverageRelationStatistics Valid=159, Invalid=1247, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:06:14,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-05-06 12:06:14,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 256. [2021-05-06 12:06:14,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:14,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:14,789 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:14,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:14,789 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:14,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:14,789 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:14,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:14,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:14,789 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:14,790 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable431 [2021-05-06 12:06:14,790 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:14,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:14,790 INFO L82 PathProgramCache]: Analyzing trace with hash 57135998, now seen corresponding path program 86 times [2021-05-06 12:06:14,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:14,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933708338] [2021-05-06 12:06:14,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:14,797 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:14,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:14,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:14,823 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:14,835 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,837 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:14,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,847 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:14,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:14,865 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:14,874 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:14,877 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:14,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,885 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:14,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:14,905 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:14,917 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,919 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:14,920 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:14,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:14,947 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:14,957 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,958 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:14,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:15,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:15,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:15,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:15,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:15,060 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:15,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:16,036 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:16,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933708338] [2021-05-06 12:06:16,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [933708338] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:16,036 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:16,036 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:06:16,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702485705] [2021-05-06 12:06:16,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:06:16,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:16,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:06:16,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1176, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:16,037 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:16,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:16,948 INFO L93 Difference]: Finished difference Result 434 states and 521 transitions. [2021-05-06 12:06:16,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:06:16,948 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:16,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:16,949 INFO L225 Difference]: With dead ends: 434 [2021-05-06 12:06:16,949 INFO L226 Difference]: Without dead ends: 293 [2021-05-06 12:06:16,950 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 1053.0ms TimeCoverageRelationStatistics Valid=166, Invalid=1316, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:16,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-05-06 12:06:17,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 256. [2021-05-06 12:06:17,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:17,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:17,069 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:17,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:17,069 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:17,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:17,070 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:17,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:17,070 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:17,070 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:17,070 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable436 [2021-05-06 12:06:17,070 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:17,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:17,070 INFO L82 PathProgramCache]: Analyzing trace with hash 119175612, now seen corresponding path program 87 times [2021-05-06 12:06:17,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:17,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889330481] [2021-05-06 12:06:17,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:17,080 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:17,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:17,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:17,110 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:17,122 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:17,125 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:17,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,135 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:17,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:17,153 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:17,164 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:17,165 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:17,182 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:17,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,204 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:17,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:17,213 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:17,229 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:17,231 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:17,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:17,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:17,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:17,262 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:17,272 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:17,273 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:17,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:17,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:17,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:17,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:17,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:17,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:17,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:18,373 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:18,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889330481] [2021-05-06 12:06:18,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1889330481] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:18,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:18,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:06:18,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304868483] [2021-05-06 12:06:18,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:06:18,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:18,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:06:18,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1243, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:06:18,375 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:19,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:19,382 INFO L93 Difference]: Finished difference Result 431 states and 518 transitions. [2021-05-06 12:06:19,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:06:19,382 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:19,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:19,383 INFO L225 Difference]: With dead ends: 431 [2021-05-06 12:06:19,383 INFO L226 Difference]: Without dead ends: 290 [2021-05-06 12:06:19,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 1061.7ms TimeCoverageRelationStatistics Valid=173, Invalid=1387, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:06:19,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-05-06 12:06:19,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 256. [2021-05-06 12:06:19,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:19,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:19,509 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:19,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:19,510 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:19,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:19,510 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:19,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:19,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:19,510 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:19,510 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable441 [2021-05-06 12:06:19,510 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:19,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:19,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1686262722, now seen corresponding path program 88 times [2021-05-06 12:06:19,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:19,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589461457] [2021-05-06 12:06:19,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:19,516 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:19,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:19,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:19,544 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:19,556 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:19,559 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:19,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:19,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:19,588 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:19,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:19,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:19,601 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:19,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:19,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:19,628 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:19,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:19,643 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:19,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:19,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:19,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:19,673 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:19,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:19,684 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:19,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:19,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:19,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:19,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:19,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:19,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:19,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:20,831 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:20,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589461457] [2021-05-06 12:06:20,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [589461457] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:20,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:20,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:06:20,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558801837] [2021-05-06 12:06:20,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:06:20,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:20,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:06:20,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1312, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:20,832 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 37 states, 37 states have (on average 1.5675675675675675) internal successors, (58), 35 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:21,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:21,830 INFO L93 Difference]: Finished difference Result 428 states and 515 transitions. [2021-05-06 12:06:21,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:06:21,830 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.5675675675675675) internal successors, (58), 35 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:21,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:21,831 INFO L225 Difference]: With dead ends: 428 [2021-05-06 12:06:21,831 INFO L226 Difference]: Without dead ends: 287 [2021-05-06 12:06:21,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 15 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 1105.1ms TimeCoverageRelationStatistics Valid=180, Invalid=1460, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:06:21,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-05-06 12:06:21,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 256. [2021-05-06 12:06:21,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:21,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:21,952 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:21,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:21,952 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:21,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.5675675675675675) internal successors, (58), 35 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:21,952 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:21,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:21,953 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:21,953 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:21,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable446 [2021-05-06 12:06:21,953 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:21,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:21,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1791056124, now seen corresponding path program 89 times [2021-05-06 12:06:21,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:21,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847564866] [2021-05-06 12:06:21,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:21,965 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:21,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:21,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:21,998 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:22,009 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:22,012 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:22,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:22,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:22,040 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:22,049 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:22,050 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:22,052 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:22,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,072 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:22,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:22,081 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:22,092 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:22,094 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:22,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:22,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:22,125 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:22,135 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:22,135 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:22,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:22,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:22,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:22,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:22,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:22,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:22,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:23,249 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:23,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847564866] [2021-05-06 12:06:23,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [847564866] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:23,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:23,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:06:23,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57639916] [2021-05-06 12:06:23,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:06:23,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:23,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:06:23,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1383, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:06:23,251 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:24,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:24,224 INFO L93 Difference]: Finished difference Result 425 states and 512 transitions. [2021-05-06 12:06:24,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:06:24,225 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:24,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:24,226 INFO L225 Difference]: With dead ends: 425 [2021-05-06 12:06:24,226 INFO L226 Difference]: Without dead ends: 284 [2021-05-06 12:06:24,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 8 SyntacticMatches, 13 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1083.6ms TimeCoverageRelationStatistics Valid=187, Invalid=1535, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:06:24,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-05-06 12:06:24,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 256. [2021-05-06 12:06:24,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:24,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:24,342 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:24,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:24,342 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:24,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:24,342 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:24,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:24,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:24,343 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:24,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable451 [2021-05-06 12:06:24,343 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:24,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:24,343 INFO L82 PathProgramCache]: Analyzing trace with hash 202708222, now seen corresponding path program 90 times [2021-05-06 12:06:24,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:24,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692195213] [2021-05-06 12:06:24,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:24,349 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:24,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:24,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:24,377 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:24,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:24,391 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:24,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:24,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:24,420 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:24,430 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:24,431 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:24,433 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:24,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:24,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:24,477 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:24,492 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:24,495 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:24,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:24,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:24,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:24,524 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:24,534 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:24,534 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:24,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:24,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:24,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:24,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:24,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:24,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:24,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:25,693 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:25,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692195213] [2021-05-06 12:06:25,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [692195213] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:25,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:25,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:06:25,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245933082] [2021-05-06 12:06:25,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:06:25,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:25,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:06:25,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1456, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:06:25,694 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 39 states, 39 states have (on average 1.4871794871794872) internal successors, (58), 37 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:26,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:26,725 INFO L93 Difference]: Finished difference Result 423 states and 510 transitions. [2021-05-06 12:06:26,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:06:26,725 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4871794871794872) internal successors, (58), 37 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:26,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:26,725 INFO L225 Difference]: With dead ends: 423 [2021-05-06 12:06:26,726 INFO L226 Difference]: Without dead ends: 282 [2021-05-06 12:06:26,726 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 13 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1123.3ms TimeCoverageRelationStatistics Valid=194, Invalid=1612, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:06:26,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-05-06 12:06:26,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 256. [2021-05-06 12:06:26,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 241 states have (on average 1.2033195020746887) internal successors, (290), 244 states have internal predecessors, (290), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:26,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 307 transitions. [2021-05-06 12:06:26,843 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 307 transitions. Word has length 64 [2021-05-06 12:06:26,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:26,843 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 307 transitions. [2021-05-06 12:06:26,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.4871794871794872) internal successors, (58), 37 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:26,844 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 307 transitions. [2021-05-06 12:06:26,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:06:26,844 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:26,844 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:26,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable456 [2021-05-06 12:06:26,844 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:26,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:26,844 INFO L82 PathProgramCache]: Analyzing trace with hash -808409028, now seen corresponding path program 91 times [2021-05-06 12:06:26,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:26,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85703209] [2021-05-06 12:06:26,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:26,850 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:26,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:26,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:26,878 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:26,890 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,892 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:26,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:26,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:26,919 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:26,929 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,930 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:26,931 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:26,932 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:26,942 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:26,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:26,959 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:26,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:26,969 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:26,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:27,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:27,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:27,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:27,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:27,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:27,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:28,179 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:28,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85703209] [2021-05-06 12:06:28,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [85703209] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:28,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:28,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:06:28,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638906066] [2021-05-06 12:06:28,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:06:28,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:28,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:06:28,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1531, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:06:28,180 INFO L87 Difference]: Start difference. First operand 256 states and 307 transitions. Second operand has 40 states, 40 states have (on average 1.45) internal successors, (58), 38 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:29,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:29,035 INFO L93 Difference]: Finished difference Result 434 states and 525 transitions. [2021-05-06 12:06:29,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:06:29,035 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 38 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 12:06:29,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:29,036 INFO L225 Difference]: With dead ends: 434 [2021-05-06 12:06:29,036 INFO L226 Difference]: Without dead ends: 282 [2021-05-06 12:06:29,036 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1183.8ms TimeCoverageRelationStatistics Valid=201, Invalid=1691, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:06:29,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-05-06 12:06:29,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 259. [2021-05-06 12:06:29,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 244 states have (on average 1.2049180327868851) internal successors, (294), 247 states have internal predecessors, (294), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:29,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 311 transitions. [2021-05-06 12:06:29,154 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 311 transitions. Word has length 64 [2021-05-06 12:06:29,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:29,154 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 311 transitions. [2021-05-06 12:06:29,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 38 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:29,154 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 311 transitions. [2021-05-06 12:06:29,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:29,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:29,154 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:29,154 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable460 [2021-05-06 12:06:29,154 INFO L428 AbstractCegarLoop]: === Iteration 105 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:29,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:29,155 INFO L82 PathProgramCache]: Analyzing trace with hash 1878189759, now seen corresponding path program 92 times [2021-05-06 12:06:29,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:29,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438049601] [2021-05-06 12:06:29,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:29,162 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:29,162 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,163 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:29,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:29,197 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:29,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:29,213 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:29,222 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:29,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:29,242 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:29,252 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:29,252 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:29,254 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:29,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:29,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:29,283 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:29,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:29,297 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:29,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:29,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:29,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:29,324 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:29,334 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:29,335 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:29,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:29,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:29,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:29,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:29,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:29,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:29,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:30,388 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:30,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438049601] [2021-05-06 12:06:30,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1438049601] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:30,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:30,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:06:30,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387487806] [2021-05-06 12:06:30,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:06:30,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:30,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:06:30,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:06:30,389 INFO L87 Difference]: Start difference. First operand 259 states and 311 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:31,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:31,282 INFO L93 Difference]: Finished difference Result 458 states and 546 transitions. [2021-05-06 12:06:31,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:06:31,282 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:31,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:31,282 INFO L225 Difference]: With dead ends: 458 [2021-05-06 12:06:31,283 INFO L226 Difference]: Without dead ends: 317 [2021-05-06 12:06:31,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 1020.2ms TimeCoverageRelationStatistics Valid=121, Invalid=935, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:31,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-06 12:06:31,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 262. [2021-05-06 12:06:31,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:31,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:31,417 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:31,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:31,418 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:31,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:31,418 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:31,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:31,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:31,418 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:31,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable465 [2021-05-06 12:06:31,418 INFO L428 AbstractCegarLoop]: === Iteration 106 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:31,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:31,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1397109501, now seen corresponding path program 93 times [2021-05-06 12:06:31,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:31,418 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125883592] [2021-05-06 12:06:31,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:31,424 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:31,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,433 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:31,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:31,451 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:31,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,465 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:31,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:31,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:31,493 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:31,503 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,504 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:31,506 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:31,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:31,527 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:31,534 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:31,546 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,548 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:31,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:31,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:31,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:31,575 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:31,585 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:31,586 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:31,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:31,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:31,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:31,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:31,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:31,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:31,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:32,633 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:32,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125883592] [2021-05-06 12:06:32,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2125883592] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:32,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:32,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:06:32,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324855553] [2021-05-06 12:06:32,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:06:32,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:32,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:06:32,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=874, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:06:32,634 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:33,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:33,695 INFO L93 Difference]: Finished difference Result 461 states and 549 transitions. [2021-05-06 12:06:33,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:06:33,695 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:33,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:33,696 INFO L225 Difference]: With dead ends: 461 [2021-05-06 12:06:33,696 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 12:06:33,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 1019.0ms TimeCoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:33,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 12:06:33,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 262. [2021-05-06 12:06:33,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:33,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:33,831 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:33,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:33,831 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:33,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:33,831 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:33,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:33,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:33,831 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:33,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable470 [2021-05-06 12:06:33,832 INFO L428 AbstractCegarLoop]: === Iteration 107 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:33,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:33,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1044021119, now seen corresponding path program 94 times [2021-05-06 12:06:33,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:33,832 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877981346] [2021-05-06 12:06:33,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:33,841 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:33,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:33,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:33,868 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:33,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,883 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:33,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,884 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:33,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:33,911 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:33,920 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:33,923 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:33,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,935 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:33,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:33,952 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:33,964 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,966 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:33,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:33,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:33,995 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:34,005 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:34,005 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:34,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:34,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:34,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:34,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:34,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:34,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:34,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:35,091 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:35,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877981346] [2021-05-06 12:06:35,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [877981346] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:35,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:35,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:06:35,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233047946] [2021-05-06 12:06:35,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:06:35,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:35,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:06:35,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=931, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:06:35,093 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:36,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:36,063 INFO L93 Difference]: Finished difference Result 458 states and 546 transitions. [2021-05-06 12:06:36,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:06:36,063 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:36,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:36,064 INFO L225 Difference]: With dead ends: 458 [2021-05-06 12:06:36,064 INFO L226 Difference]: Without dead ends: 317 [2021-05-06 12:06:36,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 1045.4ms TimeCoverageRelationStatistics Valid=135, Invalid=1055, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:36,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-06 12:06:36,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 262. [2021-05-06 12:06:36,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:36,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:36,205 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:36,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:36,205 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:36,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:36,205 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:36,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:36,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:36,206 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:36,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable475 [2021-05-06 12:06:36,206 INFO L428 AbstractCegarLoop]: === Iteration 108 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:36,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:36,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1005366723, now seen corresponding path program 95 times [2021-05-06 12:06:36,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:36,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331282079] [2021-05-06 12:06:36,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:36,218 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:36,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:36,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:36,245 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:36,258 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:36,260 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:36,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:36,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:36,289 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:36,300 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:36,301 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:36,303 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:36,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:36,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:36,333 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:36,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:36,355 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:36,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:36,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:36,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:36,384 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:36,395 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:36,395 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:36,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:36,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:36,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:36,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:36,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:36,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:36,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:37,504 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:37,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331282079] [2021-05-06 12:06:37,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [331282079] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:37,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:37,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:06:37,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949380098] [2021-05-06 12:06:37,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:06:37,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:37,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:06:37,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=990, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:06:37,509 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 32 states, 32 states have (on average 1.90625) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:38,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:38,462 INFO L93 Difference]: Finished difference Result 455 states and 543 transitions. [2021-05-06 12:06:38,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:06:38,462 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:38,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:38,463 INFO L225 Difference]: With dead ends: 455 [2021-05-06 12:06:38,463 INFO L226 Difference]: Without dead ends: 314 [2021-05-06 12:06:38,463 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1072.4ms TimeCoverageRelationStatistics Valid=142, Invalid=1118, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:38,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-05-06 12:06:38,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 262. [2021-05-06 12:06:38,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:38,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:38,610 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:38,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:38,610 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:38,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:38,610 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:38,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:38,611 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:38,611 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:38,611 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable480 [2021-05-06 12:06:38,611 INFO L428 AbstractCegarLoop]: === Iteration 109 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:38,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:38,611 INFO L82 PathProgramCache]: Analyzing trace with hash -581720001, now seen corresponding path program 96 times [2021-05-06 12:06:38,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:38,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154180310] [2021-05-06 12:06:38,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:38,623 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:38,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,645 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:38,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:38,655 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:38,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,670 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:38,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:38,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:38,698 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:38,708 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,709 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:38,712 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:38,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,731 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:38,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:38,740 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:38,752 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,755 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:38,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:38,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:38,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:38,788 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:38,798 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:38,798 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:38,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:38,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:38,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:38,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:38,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:38,902 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:38,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:39,899 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:39,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154180310] [2021-05-06 12:06:39,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1154180310] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:39,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:39,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:06:39,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847673547] [2021-05-06 12:06:39,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:06:39,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:39,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:06:39,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1051, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:06:39,901 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:40,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:40,853 INFO L93 Difference]: Finished difference Result 452 states and 540 transitions. [2021-05-06 12:06:40,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:06:40,854 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:40,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:40,855 INFO L225 Difference]: With dead ends: 452 [2021-05-06 12:06:40,855 INFO L226 Difference]: Without dead ends: 311 [2021-05-06 12:06:40,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 1062.8ms TimeCoverageRelationStatistics Valid=149, Invalid=1183, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:40,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-06 12:06:41,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 262. [2021-05-06 12:06:41,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:41,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:41,001 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:41,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:41,001 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:41,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:41,001 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:41,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:41,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:41,002 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:41,002 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable485 [2021-05-06 12:06:41,002 INFO L428 AbstractCegarLoop]: === Iteration 110 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:41,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:41,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1611079299, now seen corresponding path program 97 times [2021-05-06 12:06:41,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:41,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948259195] [2021-05-06 12:06:41,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:41,011 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:41,023 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:41,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:41,042 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:41,053 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:41,056 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:41,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:41,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:41,086 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:41,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:41,097 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:41,099 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:41,099 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,108 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:41,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:41,127 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:41,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:41,142 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:41,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:41,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:41,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:41,171 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:41,181 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:41,182 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:41,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:41,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:41,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:41,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:41,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:41,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:41,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:42,280 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:42,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948259195] [2021-05-06 12:06:42,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1948259195] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:42,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:42,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:06:42,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091818159] [2021-05-06 12:06:42,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:06:42,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:42,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:06:42,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:06:42,281 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:43,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:43,240 INFO L93 Difference]: Finished difference Result 449 states and 537 transitions. [2021-05-06 12:06:43,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:06:43,240 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:43,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:43,241 INFO L225 Difference]: With dead ends: 449 [2021-05-06 12:06:43,241 INFO L226 Difference]: Without dead ends: 308 [2021-05-06 12:06:43,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 7 SyntacticMatches, 21 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 1065.6ms TimeCoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:06:43,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-06 12:06:43,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 262. [2021-05-06 12:06:43,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:43,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:43,390 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:43,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:43,390 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:43,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:43,390 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:43,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:43,390 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:43,390 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:43,391 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable490 [2021-05-06 12:06:43,391 INFO L428 AbstractCegarLoop]: === Iteration 111 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:43,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:43,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1839882495, now seen corresponding path program 98 times [2021-05-06 12:06:43,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:43,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485498576] [2021-05-06 12:06:43,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:43,396 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:43,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,398 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:43,407 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:43,427 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:43,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,448 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:43,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:43,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:43,478 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:43,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,488 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:43,490 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:43,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:43,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:43,516 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:43,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,530 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:43,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:43,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:43,557 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:43,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,568 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:43,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:43,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:43,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:43,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:43,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:43,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:43,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:44,667 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:44,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485498576] [2021-05-06 12:06:44,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1485498576] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:44,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:44,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:06:44,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600264904] [2021-05-06 12:06:44,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:06:44,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:44,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:06:44,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1179, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:06:44,668 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:45,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:45,645 INFO L93 Difference]: Finished difference Result 446 states and 534 transitions. [2021-05-06 12:06:45,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:06:45,645 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:45,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:45,646 INFO L225 Difference]: With dead ends: 446 [2021-05-06 12:06:45,646 INFO L226 Difference]: Without dead ends: 305 [2021-05-06 12:06:45,646 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 1074.5ms TimeCoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:45,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-05-06 12:06:45,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 262. [2021-05-06 12:06:45,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:45,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:45,796 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:45,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:45,796 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:45,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:45,796 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:45,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:45,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:45,797 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:45,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable495 [2021-05-06 12:06:45,797 INFO L428 AbstractCegarLoop]: === Iteration 112 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:45,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:45,797 INFO L82 PathProgramCache]: Analyzing trace with hash 2114642109, now seen corresponding path program 99 times [2021-05-06 12:06:45,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:45,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507655863] [2021-05-06 12:06:45,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:45,803 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:45,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:45,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:45,831 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:45,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:45,846 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:45,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:45,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:45,875 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:45,885 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:45,885 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:45,887 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:45,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:45,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:45,916 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:45,927 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:45,930 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:45,939 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:45,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:45,952 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:45,959 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:45,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:45,970 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:45,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:46,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:46,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:46,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:46,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:47,101 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:47,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507655863] [2021-05-06 12:06:47,101 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1507655863] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:47,101 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:47,101 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:06:47,101 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9602989] [2021-05-06 12:06:47,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:06:47,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:47,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:06:47,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1246, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:06:47,102 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:48,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:48,018 INFO L93 Difference]: Finished difference Result 443 states and 531 transitions. [2021-05-06 12:06:48,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:06:48,018 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:48,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:48,019 INFO L225 Difference]: With dead ends: 443 [2021-05-06 12:06:48,019 INFO L226 Difference]: Without dead ends: 302 [2021-05-06 12:06:48,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 692 ImplicationChecksByTransitivity, 1098.3ms TimeCoverageRelationStatistics Valid=170, Invalid=1390, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:06:48,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-06 12:06:48,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 262. [2021-05-06 12:06:48,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:48,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:48,170 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:48,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:48,170 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:48,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:48,170 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:48,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:48,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:48,170 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:48,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable500 [2021-05-06 12:06:48,170 INFO L428 AbstractCegarLoop]: === Iteration 113 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:48,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:48,171 INFO L82 PathProgramCache]: Analyzing trace with hash -794121793, now seen corresponding path program 100 times [2021-05-06 12:06:48,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:48,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048936398] [2021-05-06 12:06:48,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:48,178 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:48,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:48,189 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:48,206 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:48,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:48,220 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:48,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:48,242 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:48,249 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:48,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:48,263 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:48,265 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:48,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:48,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:48,292 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:48,304 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:48,306 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:48,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:48,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:48,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:48,334 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:48,344 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:48,345 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:48,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:48,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:48,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:48,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:48,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:48,446 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:48,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:49,502 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:49,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048936398] [2021-05-06 12:06:49,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2048936398] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:49,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:49,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:06:49,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111927825] [2021-05-06 12:06:49,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:06:49,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:49,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:06:49,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1315, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:06:49,503 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:50,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:50,425 INFO L93 Difference]: Finished difference Result 440 states and 528 transitions. [2021-05-06 12:06:50,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:06:50,425 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:50,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:50,426 INFO L225 Difference]: With dead ends: 440 [2021-05-06 12:06:50,426 INFO L226 Difference]: Without dead ends: 299 [2021-05-06 12:06:50,426 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 1127.7ms TimeCoverageRelationStatistics Valid=177, Invalid=1463, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:06:50,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-05-06 12:06:50,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 262. [2021-05-06 12:06:50,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:50,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:50,579 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:50,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:50,579 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:50,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:50,579 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:50,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:50,579 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:50,580 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:50,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable505 [2021-05-06 12:06:50,580 INFO L428 AbstractCegarLoop]: === Iteration 114 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:50,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:50,580 INFO L82 PathProgramCache]: Analyzing trace with hash -732082179, now seen corresponding path program 101 times [2021-05-06 12:06:50,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:50,580 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2097227015] [2021-05-06 12:06:50,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:50,586 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:50,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:50,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:50,620 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:50,632 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:50,634 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:50,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:50,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:50,676 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:50,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:50,687 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:50,689 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:50,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:50,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:50,715 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:50,727 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:50,729 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:50,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,730 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:50,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:50,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:50,757 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:50,767 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:50,768 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:50,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:50,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:50,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:50,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:50,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:50,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:50,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:51,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:51,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2097227015] [2021-05-06 12:06:51,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2097227015] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:51,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:51,982 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:06:51,982 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588632406] [2021-05-06 12:06:51,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:06:51,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:51,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:06:51,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:06:51,983 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:53,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:53,272 INFO L93 Difference]: Finished difference Result 437 states and 525 transitions. [2021-05-06 12:06:53,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:06:53,272 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:53,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:53,273 INFO L225 Difference]: With dead ends: 437 [2021-05-06 12:06:53,273 INFO L226 Difference]: Without dead ends: 296 [2021-05-06 12:06:53,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 1176.5ms TimeCoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:06:53,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-05-06 12:06:53,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 262. [2021-05-06 12:06:53,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:53,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:53,424 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:53,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:53,424 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:53,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:53,424 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:53,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:53,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:53,424 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:53,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable510 [2021-05-06 12:06:53,424 INFO L428 AbstractCegarLoop]: === Iteration 115 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:53,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:53,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1757446783, now seen corresponding path program 102 times [2021-05-06 12:06:53,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:53,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296155488] [2021-05-06 12:06:53,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:53,430 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:53,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:53,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:53,458 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:53,470 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:53,472 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:53,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:53,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:53,499 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:53,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:53,509 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:53,511 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:53,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,523 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:53,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:53,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:53,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:53,553 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:53,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:53,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:53,574 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:53,581 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:53,591 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:53,591 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:53,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:53,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:53,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:53,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:53,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:53,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:53,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:54,756 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:54,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296155488] [2021-05-06 12:06:54,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [296155488] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:54,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:54,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:06:54,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077238972] [2021-05-06 12:06:54,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:06:54,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:54,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:06:54,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1459, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:06:54,758 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 39 states, 39 states have (on average 1.564102564102564) internal successors, (61), 37 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:55,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:55,905 INFO L93 Difference]: Finished difference Result 434 states and 522 transitions. [2021-05-06 12:06:55,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:06:55,905 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.564102564102564) internal successors, (61), 37 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:55,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:55,906 INFO L225 Difference]: With dead ends: 434 [2021-05-06 12:06:55,906 INFO L226 Difference]: Without dead ends: 293 [2021-05-06 12:06:55,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 1143.1ms TimeCoverageRelationStatistics Valid=191, Invalid=1615, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:06:55,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-05-06 12:06:56,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 262. [2021-05-06 12:06:56,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:56,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:56,056 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:56,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:56,057 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:56,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.564102564102564) internal successors, (61), 37 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:56,057 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:56,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:56,057 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:56,057 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:56,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable515 [2021-05-06 12:06:56,057 INFO L428 AbstractCegarLoop]: === Iteration 116 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:56,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:56,057 INFO L82 PathProgramCache]: Analyzing trace with hash 939798333, now seen corresponding path program 103 times [2021-05-06 12:06:56,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:56,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364074861] [2021-05-06 12:06:56,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:56,063 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:56,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:56,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:56,092 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:56,104 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:56,106 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:56,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:56,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:56,136 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:56,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:56,146 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:56,148 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:56,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:56,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:56,175 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:56,189 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:56,191 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:56,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:56,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:56,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:56,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:56,229 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:56,229 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:56,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:56,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:56,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:56,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:56,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:56,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:56,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:57,404 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:57,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364074861] [2021-05-06 12:06:57,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [364074861] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:57,405 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:57,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:06:57,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727754398] [2021-05-06 12:06:57,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:06:57,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:57,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:06:57,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1534, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:06:57,406 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 40 states, 40 states have (on average 1.525) internal successors, (61), 38 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:58,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:58,298 INFO L93 Difference]: Finished difference Result 431 states and 519 transitions. [2021-05-06 12:06:58,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:06:58,298 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.525) internal successors, (61), 38 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:06:58,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:58,299 INFO L225 Difference]: With dead ends: 431 [2021-05-06 12:06:58,299 INFO L226 Difference]: Without dead ends: 290 [2021-05-06 12:06:58,299 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 8 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 1142.9ms TimeCoverageRelationStatistics Valid=198, Invalid=1694, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:06:58,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-05-06 12:06:58,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 262. [2021-05-06 12:06:58,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:06:58,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:06:58,449 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:06:58,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:58,450 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:06:58,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.525) internal successors, (61), 38 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:58,450 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:06:58,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:06:58,453 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:58,453 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:58,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable520 [2021-05-06 12:06:58,453 INFO L428 AbstractCegarLoop]: === Iteration 117 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:58,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:58,453 INFO L82 PathProgramCache]: Analyzing trace with hash -648549569, now seen corresponding path program 104 times [2021-05-06 12:06:58,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:58,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211972683] [2021-05-06 12:06:58,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:58,459 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:06:58,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:58,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:58,486 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:06:58,498 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:58,500 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:06:58,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:58,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:58,528 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:06:58,538 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:58,538 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:58,540 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:06:58,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:58,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:58,569 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:06:58,580 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:58,582 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:06:58,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:58,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:06:58,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:06:58,623 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:06:58,633 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:58,634 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:58,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:58,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:58,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:58,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:06:58,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:58,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:58,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:59,861 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:59,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211972683] [2021-05-06 12:06:59,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [211972683] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:59,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:59,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:06:59,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581634549] [2021-05-06 12:06:59,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:06:59,861 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:59,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:06:59,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1611, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:06:59,862 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 39 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:00,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:00,918 INFO L93 Difference]: Finished difference Result 429 states and 517 transitions. [2021-05-06 12:07:00,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:07:00,918 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 39 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:07:00,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:00,918 INFO L225 Difference]: With dead ends: 429 [2021-05-06 12:07:00,918 INFO L226 Difference]: Without dead ends: 288 [2021-05-06 12:07:00,919 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 657 ImplicationChecksByTransitivity, 1201.6ms TimeCoverageRelationStatistics Valid=205, Invalid=1775, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:07:00,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-05-06 12:07:01,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 262. [2021-05-06 12:07:01,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.2024291497975708) internal successors, (297), 250 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:01,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 314 transitions. [2021-05-06 12:07:01,074 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 314 transitions. Word has length 67 [2021-05-06 12:07:01,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:01,074 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 314 transitions. [2021-05-06 12:07:01,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 39 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:01,074 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 314 transitions. [2021-05-06 12:07:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:07:01,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:01,075 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:01,075 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable525 [2021-05-06 12:07:01,075 INFO L428 AbstractCegarLoop]: === Iteration 118 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:01,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:01,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1659666819, now seen corresponding path program 105 times [2021-05-06 12:07:01,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:01,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359889164] [2021-05-06 12:07:01,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:01,081 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:01,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:01,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:01,101 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:01,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:01,111 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:01,123 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:01,125 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:01,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:01,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:01,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:01,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:01,154 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:01,165 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:01,166 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:01,167 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:01,168 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:01,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:01,179 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:01,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:01,197 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:01,207 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:01,207 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:01,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:01,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:01,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:01,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:01,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:01,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:02,463 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:02,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359889164] [2021-05-06 12:07:02,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [359889164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:02,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:02,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:07:02,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631351756] [2021-05-06 12:07:02,463 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:07:02,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:02,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:07:02,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1690, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:07:02,464 INFO L87 Difference]: Start difference. First operand 262 states and 314 transitions. Second operand has 42 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 40 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:03,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:03,632 INFO L93 Difference]: Finished difference Result 440 states and 532 transitions. [2021-05-06 12:07:03,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:07:03,632 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 40 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2021-05-06 12:07:03,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:03,633 INFO L225 Difference]: With dead ends: 440 [2021-05-06 12:07:03,633 INFO L226 Difference]: Without dead ends: 288 [2021-05-06 12:07:03,633 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 1210.1ms TimeCoverageRelationStatistics Valid=212, Invalid=1858, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:07:03,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-05-06 12:07:03,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 265. [2021-05-06 12:07:03,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.204) internal successors, (301), 253 states have internal predecessors, (301), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:03,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 318 transitions. [2021-05-06 12:07:03,785 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 318 transitions. Word has length 67 [2021-05-06 12:07:03,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:03,785 INFO L480 AbstractCegarLoop]: Abstraction has 265 states and 318 transitions. [2021-05-06 12:07:03,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 40 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:03,785 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 318 transitions. [2021-05-06 12:07:03,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 12:07:03,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:03,785 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:03,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable529 [2021-05-06 12:07:03,785 INFO L428 AbstractCegarLoop]: === Iteration 119 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:03,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:03,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1230069541, now seen corresponding path program 6 times [2021-05-06 12:07:03,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:03,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378925833] [2021-05-06 12:07:03,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:03,796 WARN L240 tifierPushTermWalker]: treesize reduction 74, result has 49.7 percent of original size [2021-05-06 12:07:03,834 WARN L245 tifierPushTermWalker]: treesize reduction 74, result has 49.7 percent of original size 73 [2021-05-06 12:07:03,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:03,866 WARN L240 tifierPushTermWalker]: treesize reduction 78, result has 50.3 percent of original size [2021-05-06 12:07:03,908 WARN L245 tifierPushTermWalker]: treesize reduction 78, result has 50.3 percent of original size 79 [2021-05-06 12:07:03,934 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:03,936 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:03,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:04,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:04,163 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:04,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378925833] [2021-05-06 12:07:04,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [378925833] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:04,163 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:04,163 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:07:04,163 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148333794] [2021-05-06 12:07:04,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:07:04,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:04,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:07:04,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:07:04,164 INFO L87 Difference]: Start difference. First operand 265 states and 318 transitions. Second operand has 19 states, 19 states have (on average 3.0) internal successors, (57), 18 states have internal predecessors, (57), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:07:04,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:04,631 INFO L93 Difference]: Finished difference Result 512 states and 614 transitions. [2021-05-06 12:07:04,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:07:04,631 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0) internal successors, (57), 18 states have internal predecessors, (57), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-05-06 12:07:04,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:04,632 INFO L225 Difference]: With dead ends: 512 [2021-05-06 12:07:04,632 INFO L226 Difference]: Without dead ends: 362 [2021-05-06 12:07:04,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 12 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 270.4ms TimeCoverageRelationStatistics Valid=197, Invalid=453, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:07:04,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-06 12:07:04,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 283. [2021-05-06 12:07:04,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 268 states have (on average 1.2014925373134329) internal successors, (322), 271 states have internal predecessors, (322), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:04,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 339 transitions. [2021-05-06 12:07:04,788 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 339 transitions. Word has length 69 [2021-05-06 12:07:04,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:04,788 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 339 transitions. [2021-05-06 12:07:04,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0) internal successors, (57), 18 states have internal predecessors, (57), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:07:04,788 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 339 transitions. [2021-05-06 12:07:04,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:04,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:04,788 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:04,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable530 [2021-05-06 12:07:04,788 INFO L428 AbstractCegarLoop]: === Iteration 120 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:04,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:04,789 INFO L82 PathProgramCache]: Analyzing trace with hash -899647012, now seen corresponding path program 106 times [2021-05-06 12:07:04,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:04,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976018759] [2021-05-06 12:07:04,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:04,796 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:04,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:04,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:04,824 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:04,836 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,838 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:04,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:04,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:04,867 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:04,876 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,877 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:04,879 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:04,890 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,891 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:04,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:04,907 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:04,919 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,922 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:04,922 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:04,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:04,950 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:04,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,960 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:04,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:05,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:05,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:05,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:06,082 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:06,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976018759] [2021-05-06 12:07:06,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1976018759] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:06,083 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:06,083 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:07:06,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438087602] [2021-05-06 12:07:06,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:07:06,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:06,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:07:06,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:07:06,083 INFO L87 Difference]: Start difference. First operand 283 states and 339 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:07,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:07,122 INFO L93 Difference]: Finished difference Result 506 states and 601 transitions. [2021-05-06 12:07:07,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:07:07,122 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:07,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:07,123 INFO L225 Difference]: With dead ends: 506 [2021-05-06 12:07:07,123 INFO L226 Difference]: Without dead ends: 347 [2021-05-06 12:07:07,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 7 SyntacticMatches, 28 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 1092.3ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:07:07,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-05-06 12:07:07,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 286. [2021-05-06 12:07:07,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:07,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:07,293 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:07,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:07,293 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:07,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:07,293 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:07,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:07,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:07,293 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:07,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable535 [2021-05-06 12:07:07,294 INFO L428 AbstractCegarLoop]: === Iteration 121 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:07,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:07,294 INFO L82 PathProgramCache]: Analyzing trace with hash -455746338, now seen corresponding path program 107 times [2021-05-06 12:07:07,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:07,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304887907] [2021-05-06 12:07:07,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:07,302 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:07,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:07,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:07,334 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:07,345 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:07,347 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:07,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:07,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:07,378 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:07,388 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:07,389 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:07,391 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:07,402 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,416 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:07,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:07,438 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:07,450 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:07,452 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:07,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:07,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:07,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:07,490 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:07,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:07,502 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:07,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:07,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:07,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:07,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:07,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:07,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:07,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:08,612 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:08,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304887907] [2021-05-06 12:07:08,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1304887907] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:08,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:08,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:07:08,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951305044] [2021-05-06 12:07:08,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:07:08,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:08,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:07:08,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:07:08,613 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:09,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:09,830 INFO L93 Difference]: Finished difference Result 509 states and 604 transitions. [2021-05-06 12:07:09,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:07:09,830 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:09,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:09,831 INFO L225 Difference]: With dead ends: 509 [2021-05-06 12:07:09,831 INFO L226 Difference]: Without dead ends: 350 [2021-05-06 12:07:09,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 1083.2ms TimeCoverageRelationStatistics Valid=132, Invalid=1058, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:07:09,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-05-06 12:07:10,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 286. [2021-05-06 12:07:10,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:10,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:10,009 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:10,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:10,009 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:10,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:10,009 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:10,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:10,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:10,010 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:10,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable540 [2021-05-06 12:07:10,010 INFO L428 AbstractCegarLoop]: === Iteration 122 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:10,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:10,010 INFO L82 PathProgramCache]: Analyzing trace with hash -936826596, now seen corresponding path program 108 times [2021-05-06 12:07:10,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:10,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584268481] [2021-05-06 12:07:10,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:10,016 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:10,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:10,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:10,044 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:10,055 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:10,058 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:10,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,067 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,076 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:10,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:10,092 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:10,102 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:10,103 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:10,105 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:10,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:10,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:10,132 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:10,144 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:10,146 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:10,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:10,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:10,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:10,175 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:10,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:10,185 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:10,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:10,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:10,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:10,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:10,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:10,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:10,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:11,336 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:11,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584268481] [2021-05-06 12:07:11,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [584268481] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:11,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:11,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:07:11,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411712506] [2021-05-06 12:07:11,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:07:11,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:11,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:07:11,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=993, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:07:11,338 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:12,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:12,371 INFO L93 Difference]: Finished difference Result 506 states and 601 transitions. [2021-05-06 12:07:12,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:07:12,371 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:12,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:12,372 INFO L225 Difference]: With dead ends: 506 [2021-05-06 12:07:12,372 INFO L226 Difference]: Without dead ends: 347 [2021-05-06 12:07:12,372 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 1127.2ms TimeCoverageRelationStatistics Valid=139, Invalid=1121, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:12,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-05-06 12:07:12,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 286. [2021-05-06 12:07:12,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:12,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:12,553 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:12,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:12,554 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:12,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:12,554 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:12,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:12,554 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:12,554 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:12,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable545 [2021-05-06 12:07:12,554 INFO L428 AbstractCegarLoop]: === Iteration 123 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:12,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:12,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1289914978, now seen corresponding path program 109 times [2021-05-06 12:07:12,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:12,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301678269] [2021-05-06 12:07:12,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:12,560 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:12,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:12,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:12,587 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:12,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:12,600 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:12,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:12,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:12,629 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:12,638 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:12,639 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:12,641 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:12,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:12,653 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:12,677 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:12,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:12,694 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:12,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:12,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:12,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:12,725 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:12,735 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:12,736 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:12,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:12,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:12,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:12,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:12,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:12,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:12,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:13,868 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:13,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301678269] [2021-05-06 12:07:13,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1301678269] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:13,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:13,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:07:13,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602165485] [2021-05-06 12:07:13,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:07:13,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:13,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:07:13,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:07:13,869 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:15,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:15,057 INFO L93 Difference]: Finished difference Result 503 states and 598 transitions. [2021-05-06 12:07:15,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:07:15,057 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:15,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:15,058 INFO L225 Difference]: With dead ends: 503 [2021-05-06 12:07:15,058 INFO L226 Difference]: Without dead ends: 344 [2021-05-06 12:07:15,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1107.5ms TimeCoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:15,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-05-06 12:07:15,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 286. [2021-05-06 12:07:15,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:15,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:15,245 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:15,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:15,245 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:15,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:15,246 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:15,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:15,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:15,246 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:15,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable550 [2021-05-06 12:07:15,246 INFO L428 AbstractCegarLoop]: === Iteration 124 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:15,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:15,246 INFO L82 PathProgramCache]: Analyzing trace with hash 955664476, now seen corresponding path program 110 times [2021-05-06 12:07:15,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:15,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602685691] [2021-05-06 12:07:15,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:15,252 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:15,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:15,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:15,280 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:15,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,294 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:15,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:15,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:15,329 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:15,339 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,340 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:15,342 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:15,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,343 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:15,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:15,369 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:15,381 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,383 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:15,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:15,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:15,412 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:15,422 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,423 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:15,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:15,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:15,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:15,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:15,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:15,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:15,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:16,571 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:16,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602685691] [2021-05-06 12:07:16,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [602685691] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:16,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:16,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:07:16,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448338335] [2021-05-06 12:07:16,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:07:16,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:16,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:07:16,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1117, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:16,572 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:17,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:17,636 INFO L93 Difference]: Finished difference Result 500 states and 595 transitions. [2021-05-06 12:07:17,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:07:17,637 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:17,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:17,637 INFO L225 Difference]: With dead ends: 500 [2021-05-06 12:07:17,637 INFO L226 Difference]: Without dead ends: 341 [2021-05-06 12:07:17,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1121.7ms TimeCoverageRelationStatistics Valid=153, Invalid=1253, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:07:17,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-05-06 12:07:17,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 286. [2021-05-06 12:07:17,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:17,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:17,823 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:17,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:17,823 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:17,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:17,823 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:17,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:17,824 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:17,824 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:17,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable555 [2021-05-06 12:07:17,824 INFO L428 AbstractCegarLoop]: === Iteration 125 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:17,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:17,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1379311198, now seen corresponding path program 111 times [2021-05-06 12:07:17,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:17,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955637031] [2021-05-06 12:07:17,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:17,829 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:17,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,838 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:17,840 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:17,857 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:17,871 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,874 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:17,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:17,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:17,906 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:17,916 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,916 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:17,918 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:17,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:17,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:17,954 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:17,965 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,967 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:17,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,977 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:17,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:18,003 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:18,013 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:18,014 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:18,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:18,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:18,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:18,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:18,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:18,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:18,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:19,240 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:19,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955637031] [2021-05-06 12:07:19,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1955637031] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:19,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:19,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:07:19,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451795966] [2021-05-06 12:07:19,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:07:19,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:19,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:07:19,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1182, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:19,241 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:20,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:20,462 INFO L93 Difference]: Finished difference Result 497 states and 592 transitions. [2021-05-06 12:07:20,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:07:20,462 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:20,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:20,463 INFO L225 Difference]: With dead ends: 497 [2021-05-06 12:07:20,463 INFO L226 Difference]: Without dead ends: 338 [2021-05-06 12:07:20,463 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 1198.6ms TimeCoverageRelationStatistics Valid=160, Invalid=1322, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:07:20,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-05-06 12:07:20,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 286. [2021-05-06 12:07:20,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:20,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:20,654 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:20,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:20,654 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:20,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:20,655 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:20,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:20,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:20,655 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:20,655 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable560 [2021-05-06 12:07:20,655 INFO L428 AbstractCegarLoop]: === Iteration 126 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:20,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:20,655 INFO L82 PathProgramCache]: Analyzing trace with hash 349951900, now seen corresponding path program 112 times [2021-05-06 12:07:20,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:20,656 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694759130] [2021-05-06 12:07:20,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:20,688 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:20,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:20,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:20,720 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:20,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,746 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:20,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:20,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:20,778 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:20,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,796 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:20,798 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:20,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:20,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:20,838 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:20,850 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,852 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:20,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:20,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:20,879 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:20,893 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:20,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:20,903 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:20,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:21,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:21,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:21,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:21,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:21,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:21,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:22,375 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:22,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694759130] [2021-05-06 12:07:22,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1694759130] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:22,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:22,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:07:22,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907032126] [2021-05-06 12:07:22,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:07:22,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:22,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:07:22,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1249, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:07:22,377 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:23,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:23,602 INFO L93 Difference]: Finished difference Result 494 states and 589 transitions. [2021-05-06 12:07:23,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:07:23,603 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:23,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:23,603 INFO L225 Difference]: With dead ends: 494 [2021-05-06 12:07:23,603 INFO L226 Difference]: Without dead ends: 335 [2021-05-06 12:07:23,603 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 1422.2ms TimeCoverageRelationStatistics Valid=167, Invalid=1393, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:07:23,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-05-06 12:07:23,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 286. [2021-05-06 12:07:23,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:23,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:23,803 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:23,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:23,803 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:23,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:23,803 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:23,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:23,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:23,804 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:23,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable565 [2021-05-06 12:07:23,804 INFO L428 AbstractCegarLoop]: === Iteration 127 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:23,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:23,804 INFO L82 PathProgramCache]: Analyzing trace with hash -494053602, now seen corresponding path program 113 times [2021-05-06 12:07:23,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:23,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793858044] [2021-05-06 12:07:23,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:23,810 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:23,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,822 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,828 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:23,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:23,837 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:23,849 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,851 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:23,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:23,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:23,885 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:23,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,895 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:23,897 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:23,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:23,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:23,923 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:23,935 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,937 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:23,945 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,946 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:23,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:23,964 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:23,974 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,974 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:23,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:24,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:24,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:24,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:24,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:24,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:25,302 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:25,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793858044] [2021-05-06 12:07:25,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1793858044] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:25,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:25,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:07:25,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718271210] [2021-05-06 12:07:25,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:07:25,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:25,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:07:25,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1318, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:07:25,303 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:26,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:26,346 INFO L93 Difference]: Finished difference Result 491 states and 586 transitions. [2021-05-06 12:07:26,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:07:26,346 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:26,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:26,347 INFO L225 Difference]: With dead ends: 491 [2021-05-06 12:07:26,347 INFO L226 Difference]: Without dead ends: 332 [2021-05-06 12:07:26,347 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 757 ImplicationChecksByTransitivity, 1293.7ms TimeCoverageRelationStatistics Valid=174, Invalid=1466, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:07:26,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-05-06 12:07:26,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 286. [2021-05-06 12:07:26,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:26,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:26,542 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:26,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:26,542 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:26,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:26,542 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:26,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:26,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:26,542 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:26,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable570 [2021-05-06 12:07:26,542 INFO L428 AbstractCegarLoop]: === Iteration 128 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:26,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:26,543 INFO L82 PathProgramCache]: Analyzing trace with hash -219293988, now seen corresponding path program 114 times [2021-05-06 12:07:26,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:26,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140567380] [2021-05-06 12:07:26,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:26,549 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:26,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:26,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:26,583 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:26,595 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,597 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:26,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:26,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:26,625 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:26,635 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:26,637 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:26,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:26,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:26,663 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:26,675 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:26,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:26,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:26,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:26,708 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:26,718 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:26,719 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:26,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:26,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:26,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:26,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:26,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:26,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:26,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:27,884 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:27,884 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140567380] [2021-05-06 12:07:27,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [140567380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:27,884 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:27,884 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:07:27,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900818166] [2021-05-06 12:07:27,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:07:27,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:27,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:07:27,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1389, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:07:27,886 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:28,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:28,983 INFO L93 Difference]: Finished difference Result 488 states and 583 transitions. [2021-05-06 12:07:28,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:07:28,984 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:28,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:28,984 INFO L225 Difference]: With dead ends: 488 [2021-05-06 12:07:28,984 INFO L226 Difference]: Without dead ends: 329 [2021-05-06 12:07:28,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 9 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 1132.2ms TimeCoverageRelationStatistics Valid=181, Invalid=1541, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:07:28,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-05-06 12:07:29,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 286. [2021-05-06 12:07:29,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:29,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:29,184 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:29,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:29,184 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:29,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:29,184 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:29,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:29,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:29,184 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:29,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable575 [2021-05-06 12:07:29,184 INFO L428 AbstractCegarLoop]: === Iteration 129 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:29,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:29,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1166909406, now seen corresponding path program 115 times [2021-05-06 12:07:29,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:29,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327204747] [2021-05-06 12:07:29,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:29,190 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:29,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:29,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:29,218 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:29,233 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:29,235 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:29,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:29,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:29,264 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:29,273 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:29,274 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:29,276 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:29,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:29,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:29,304 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:29,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:29,318 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:29,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:29,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:29,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:29,346 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:29,356 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:29,356 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:29,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:29,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:29,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:29,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:29,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:29,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:29,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:30,576 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:30,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327204747] [2021-05-06 12:07:30,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1327204747] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:30,576 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:30,576 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:07:30,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830926051] [2021-05-06 12:07:30,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:07:30,577 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:30,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:07:30,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1462, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:07:30,577 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:31,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:31,722 INFO L93 Difference]: Finished difference Result 485 states and 580 transitions. [2021-05-06 12:07:31,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:07:31,722 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:31,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:31,723 INFO L225 Difference]: With dead ends: 485 [2021-05-06 12:07:31,723 INFO L226 Difference]: Without dead ends: 326 [2021-05-06 12:07:31,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 7 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 757 ImplicationChecksByTransitivity, 1194.3ms TimeCoverageRelationStatistics Valid=188, Invalid=1618, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:07:31,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-05-06 12:07:31,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 286. [2021-05-06 12:07:31,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:31,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:31,919 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:31,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:31,919 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:31,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:31,919 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:31,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:31,920 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:31,920 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:31,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable580 [2021-05-06 12:07:31,920 INFO L428 AbstractCegarLoop]: === Iteration 130 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:31,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:31,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1228949020, now seen corresponding path program 116 times [2021-05-06 12:07:31,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:31,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628898173] [2021-05-06 12:07:31,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:31,926 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:31,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:31,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:31,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:31,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:31,952 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:31,973 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:31,977 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:31,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:31,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:32,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:32,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:32,016 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:32,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:32,027 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:32,029 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:32,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:32,030 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:32,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:32,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:32,055 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:32,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:32,069 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:32,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:32,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:32,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:32,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:32,097 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:32,107 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:32,107 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:32,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:32,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:32,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:32,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:32,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:32,213 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:32,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:33,354 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:33,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628898173] [2021-05-06 12:07:33,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [628898173] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:33,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:33,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:07:33,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730213865] [2021-05-06 12:07:33,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:07:33,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:33,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:07:33,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1537, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:07:33,355 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:34,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:34,414 INFO L93 Difference]: Finished difference Result 482 states and 577 transitions. [2021-05-06 12:07:34,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:07:34,414 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:34,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:34,415 INFO L225 Difference]: With dead ends: 482 [2021-05-06 12:07:34,415 INFO L226 Difference]: Without dead ends: 323 [2021-05-06 12:07:34,415 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 781 ImplicationChecksByTransitivity, 1215.4ms TimeCoverageRelationStatistics Valid=195, Invalid=1697, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:07:34,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-05-06 12:07:34,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 286. [2021-05-06 12:07:34,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:34,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:34,624 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:34,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:34,624 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:34,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:34,625 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:34,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:34,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:34,625 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:34,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable585 [2021-05-06 12:07:34,625 INFO L428 AbstractCegarLoop]: === Iteration 131 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:34,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:34,625 INFO L82 PathProgramCache]: Analyzing trace with hash -576489314, now seen corresponding path program 117 times [2021-05-06 12:07:34,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:34,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4861097] [2021-05-06 12:07:34,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:34,631 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:34,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:34,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:34,660 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:34,671 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:34,673 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:34,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,675 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:34,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:34,700 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:34,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:34,711 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:34,713 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:34,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:34,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:34,738 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:34,750 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:34,752 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:34,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:34,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:34,783 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:34,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:34,793 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:34,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:34,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:34,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:34,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:34,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:36,052 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:36,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4861097] [2021-05-06 12:07:36,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [4861097] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:36,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:36,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:07:36,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774972739] [2021-05-06 12:07:36,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:07:36,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:36,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:07:36,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1614, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:07:36,053 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 41 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 39 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:37,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:37,302 INFO L93 Difference]: Finished difference Result 479 states and 574 transitions. [2021-05-06 12:07:37,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:07:37,303 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 39 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:37,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:37,303 INFO L225 Difference]: With dead ends: 479 [2021-05-06 12:07:37,303 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 12:07:37,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 8 SyntacticMatches, 16 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 1233.6ms TimeCoverageRelationStatistics Valid=202, Invalid=1778, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:07:37,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 12:07:37,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 286. [2021-05-06 12:07:37,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:37,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:37,498 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:37,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:37,498 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:37,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 39 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:37,498 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:37,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:37,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:37,498 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:37,499 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable590 [2021-05-06 12:07:37,499 INFO L428 AbstractCegarLoop]: === Iteration 132 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:37,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:37,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1394137764, now seen corresponding path program 118 times [2021-05-06 12:07:37,499 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:37,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596603214] [2021-05-06 12:07:37,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:37,504 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:37,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,516 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:37,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:37,532 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:37,544 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:37,546 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:37,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,556 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:37,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:37,574 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:37,584 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:37,585 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:37,587 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:37,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:37,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:37,615 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:37,627 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:37,629 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:37,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:37,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:37,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:37,661 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:37,671 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:37,671 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:37,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:37,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:37,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:37,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:37,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:37,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:37,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:38,998 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:38,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596603214] [2021-05-06 12:07:38,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [596603214] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:38,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:38,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:07:38,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48752978] [2021-05-06 12:07:38,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:07:38,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:38,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:07:38,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1693, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:07:39,000 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 40 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:40,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:40,349 INFO L93 Difference]: Finished difference Result 476 states and 571 transitions. [2021-05-06 12:07:40,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:07:40,349 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 40 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:40,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:40,349 INFO L225 Difference]: With dead ends: 476 [2021-05-06 12:07:40,350 INFO L226 Difference]: Without dead ends: 317 [2021-05-06 12:07:40,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 1300.2ms TimeCoverageRelationStatistics Valid=209, Invalid=1861, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:07:40,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-06 12:07:40,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 286. [2021-05-06 12:07:40,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:40,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:40,547 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:40,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:40,547 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:40,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 40 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:40,547 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:40,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:40,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:40,547 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:40,547 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable595 [2021-05-06 12:07:40,547 INFO L428 AbstractCegarLoop]: === Iteration 133 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:40,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:40,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1312481630, now seen corresponding path program 119 times [2021-05-06 12:07:40,548 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:40,548 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53737494] [2021-05-06 12:07:40,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:40,567 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:40,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:40,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:40,594 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:40,606 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:40,608 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:40,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:40,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:40,638 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:40,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:40,650 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:40,652 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:40,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:40,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:40,680 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:40,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:40,694 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:40,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:40,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:40,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:40,722 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:40,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:40,732 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:40,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:40,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:40,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:40,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:40,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:40,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:40,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:42,110 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:42,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53737494] [2021-05-06 12:07:42,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [53737494] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:42,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:42,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:07:42,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748248173] [2021-05-06 12:07:42,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:07:42,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:42,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:07:42,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1774, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:07:42,111 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 43 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 41 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:43,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:43,277 INFO L93 Difference]: Finished difference Result 474 states and 569 transitions. [2021-05-06 12:07:43,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:07:43,278 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 41 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:43,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:43,278 INFO L225 Difference]: With dead ends: 474 [2021-05-06 12:07:43,278 INFO L226 Difference]: Without dead ends: 315 [2021-05-06 12:07:43,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 1347.0ms TimeCoverageRelationStatistics Valid=216, Invalid=1946, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:07:43,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-05-06 12:07:43,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 286. [2021-05-06 12:07:43,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 271 states have (on average 1.1992619926199262) internal successors, (325), 274 states have internal predecessors, (325), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:43,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 342 transitions. [2021-05-06 12:07:43,476 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 342 transitions. Word has length 70 [2021-05-06 12:07:43,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:43,477 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 342 transitions. [2021-05-06 12:07:43,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 41 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:43,477 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 342 transitions. [2021-05-06 12:07:43,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:07:43,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:43,477 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:43,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable600 [2021-05-06 12:07:43,477 INFO L428 AbstractCegarLoop]: === Iteration 134 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:43,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:43,477 INFO L82 PathProgramCache]: Analyzing trace with hash 301364380, now seen corresponding path program 120 times [2021-05-06 12:07:43,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:43,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960570421] [2021-05-06 12:07:43,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:43,485 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:43,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:43,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:43,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:43,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:43,515 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:43,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:43,529 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:43,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:43,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:43,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:43,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:43,557 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:43,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:43,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:43,568 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:43,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:43,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:43,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:43,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:43,595 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:43,606 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:43,607 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:43,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:43,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:43,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:43,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:43,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:43,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:44,961 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:44,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960570421] [2021-05-06 12:07:44,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [960570421] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:44,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:44,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:07:44,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121073897] [2021-05-06 12:07:44,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:07:44,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:44,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:07:44,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:07:44,963 INFO L87 Difference]: Start difference. First operand 286 states and 342 transitions. Second operand has 44 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 42 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:46,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:46,175 INFO L93 Difference]: Finished difference Result 485 states and 584 transitions. [2021-05-06 12:07:46,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:07:46,175 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 42 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2021-05-06 12:07:46,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:46,176 INFO L225 Difference]: With dead ends: 485 [2021-05-06 12:07:46,176 INFO L226 Difference]: Without dead ends: 315 [2021-05-06 12:07:46,176 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 1335.5ms TimeCoverageRelationStatistics Valid=223, Invalid=2033, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:07:46,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-05-06 12:07:46,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 289. [2021-05-06 12:07:46,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 274 states have (on average 1.2007299270072993) internal successors, (329), 277 states have internal predecessors, (329), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:46,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 346 transitions. [2021-05-06 12:07:46,374 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 346 transitions. Word has length 70 [2021-05-06 12:07:46,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:46,375 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 346 transitions. [2021-05-06 12:07:46,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 42 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:46,375 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 346 transitions. [2021-05-06 12:07:46,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:46,375 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:46,375 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:46,375 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable604 [2021-05-06 12:07:46,375 INFO L428 AbstractCegarLoop]: === Iteration 135 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:46,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:46,375 INFO L82 PathProgramCache]: Analyzing trace with hash -5032545, now seen corresponding path program 121 times [2021-05-06 12:07:46,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:46,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140116880] [2021-05-06 12:07:46,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:46,383 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:46,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:46,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:46,413 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:46,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:46,427 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:46,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:46,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:46,453 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:46,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:46,463 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:46,465 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:46,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:46,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:46,493 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:46,509 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:46,512 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:46,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:46,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:46,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:46,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:46,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:46,550 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:46,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:46,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:46,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:46,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:46,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:46,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:46,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:47,767 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:47,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140116880] [2021-05-06 12:07:47,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [140116880] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:47,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:47,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:07:47,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741801896] [2021-05-06 12:07:47,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:07:47,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:47,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:07:47,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:07:47,768 INFO L87 Difference]: Start difference. First operand 289 states and 346 transitions. Second operand has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:48,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:48,911 INFO L93 Difference]: Finished difference Result 515 states and 611 transitions. [2021-05-06 12:07:48,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:07:48,911 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:48,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:48,911 INFO L225 Difference]: With dead ends: 515 [2021-05-06 12:07:48,912 INFO L226 Difference]: Without dead ends: 356 [2021-05-06 12:07:48,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 1185.0ms TimeCoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:07:48,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-06 12:07:49,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 292. [2021-05-06 12:07:49,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:49,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:07:49,131 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:07:49,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:49,131 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:07:49,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:49,131 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:07:49,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:49,131 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:49,131 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:49,131 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable609 [2021-05-06 12:07:49,131 INFO L428 AbstractCegarLoop]: === Iteration 136 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:49,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:49,132 INFO L82 PathProgramCache]: Analyzing trace with hash 35642205, now seen corresponding path program 122 times [2021-05-06 12:07:49,132 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:49,132 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232686383] [2021-05-06 12:07:49,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:49,161 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:49,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:49,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:49,191 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:49,204 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,207 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:49,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:49,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:49,236 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:49,246 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:49,249 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:49,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:49,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:49,279 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:49,291 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,293 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:49,302 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,303 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:49,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:49,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:49,322 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:49,332 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:49,332 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:49,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:49,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:49,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:49,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:49,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:49,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:49,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:50,536 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:50,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1232686383] [2021-05-06 12:07:50,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1232686383] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:50,536 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:50,536 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:07:50,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819673351] [2021-05-06 12:07:50,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:07:50,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:50,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:07:50,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=996, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:07:50,538 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:51,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:51,912 INFO L93 Difference]: Finished difference Result 518 states and 614 transitions. [2021-05-06 12:07:51,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:07:51,912 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:51,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:51,913 INFO L225 Difference]: With dead ends: 518 [2021-05-06 12:07:51,913 INFO L226 Difference]: Without dead ends: 359 [2021-05-06 12:07:51,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 1185.8ms TimeCoverageRelationStatistics Valid=136, Invalid=1124, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:51,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-05-06 12:07:52,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 292. [2021-05-06 12:07:52,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:52,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:07:52,145 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:07:52,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:52,145 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:07:52,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:52,145 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:07:52,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:52,145 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:52,146 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:52,146 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable614 [2021-05-06 12:07:52,146 INFO L428 AbstractCegarLoop]: === Iteration 137 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:52,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:52,146 INFO L82 PathProgramCache]: Analyzing trace with hash 479542879, now seen corresponding path program 123 times [2021-05-06 12:07:52,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:52,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628288090] [2021-05-06 12:07:52,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:52,153 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:52,154 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:52,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:52,181 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:52,192 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,194 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:52,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:52,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:52,223 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:52,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,233 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:52,235 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:52,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:52,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:52,262 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:52,274 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,276 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:52,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:52,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:52,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:52,307 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:52,317 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:52,318 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:52,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:52,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:52,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:52,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:52,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:52,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:52,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:53,544 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:53,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628288090] [2021-05-06 12:07:53,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [628288090] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:53,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:53,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:07:53,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486933555] [2021-05-06 12:07:53,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:07:53,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:53,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:07:53,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:07:53,545 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:54,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:54,994 INFO L93 Difference]: Finished difference Result 515 states and 611 transitions. [2021-05-06 12:07:54,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:07:54,994 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:54,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:54,994 INFO L225 Difference]: With dead ends: 515 [2021-05-06 12:07:54,995 INFO L226 Difference]: Without dead ends: 356 [2021-05-06 12:07:54,995 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 1197.8ms TimeCoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:54,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-06 12:07:55,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 292. [2021-05-06 12:07:55,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:55,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:07:55,234 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:07:55,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:55,234 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:07:55,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:55,235 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:07:55,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:55,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:55,235 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:55,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable619 [2021-05-06 12:07:55,235 INFO L428 AbstractCegarLoop]: === Iteration 138 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:55,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:55,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1537379, now seen corresponding path program 124 times [2021-05-06 12:07:55,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:55,235 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914203351] [2021-05-06 12:07:55,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:55,241 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:55,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:55,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:55,270 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:55,281 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,284 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:55,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,294 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:55,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:55,312 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:55,322 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,322 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:55,325 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:55,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:55,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:55,352 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:55,364 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,366 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:55,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:55,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:55,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:55,403 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:55,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:55,414 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:55,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:55,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:55,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:55,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:55,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:55,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:55,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:56,653 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:56,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914203351] [2021-05-06 12:07:56,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [914203351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:56,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:56,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:07:56,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255437448] [2021-05-06 12:07:56,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:07:56,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:56,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:07:56,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1120, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:07:56,654 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:58,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:58,048 INFO L93 Difference]: Finished difference Result 512 states and 608 transitions. [2021-05-06 12:07:58,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:07:58,049 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:07:58,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:58,049 INFO L225 Difference]: With dead ends: 512 [2021-05-06 12:07:58,049 INFO L226 Difference]: Without dead ends: 353 [2021-05-06 12:07:58,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 1206.2ms TimeCoverageRelationStatistics Valid=150, Invalid=1256, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:07:58,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-05-06 12:07:58,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 292. [2021-05-06 12:07:58,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:07:58,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:07:58,285 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:07:58,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:58,285 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:07:58,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:58,285 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:07:58,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:07:58,286 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:58,286 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:58,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable624 [2021-05-06 12:07:58,286 INFO L428 AbstractCegarLoop]: === Iteration 139 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:58,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:58,286 INFO L82 PathProgramCache]: Analyzing trace with hash -354625761, now seen corresponding path program 125 times [2021-05-06 12:07:58,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:58,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507576650] [2021-05-06 12:07:58,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:58,291 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:07:58,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:58,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:58,322 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:07:58,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,336 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:07:58,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:58,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:58,364 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:07:58,374 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,374 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:58,376 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:07:58,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:58,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:58,403 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:07:58,415 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,417 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:07:58,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,432 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:58,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:07:58,445 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:07:58,452 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:07:58,462 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:58,462 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:58,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:58,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:58,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:58,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:07:58,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:58,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:58,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:59,706 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:59,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507576650] [2021-05-06 12:07:59,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1507576650] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:59,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:59,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:07:59,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262046715] [2021-05-06 12:07:59,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:07:59,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:59,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:07:59,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1185, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:07:59,708 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:01,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:01,044 INFO L93 Difference]: Finished difference Result 509 states and 605 transitions. [2021-05-06 12:08:01,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:08:01,045 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:01,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:01,045 INFO L225 Difference]: With dead ends: 509 [2021-05-06 12:08:01,045 INFO L226 Difference]: Without dead ends: 350 [2021-05-06 12:08:01,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 1205.1ms TimeCoverageRelationStatistics Valid=157, Invalid=1325, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:08:01,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-05-06 12:08:01,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 292. [2021-05-06 12:08:01,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:01,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:01,285 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:01,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:01,285 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:01,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:01,285 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:01,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:01,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:01,285 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:01,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable629 [2021-05-06 12:08:01,285 INFO L428 AbstractCegarLoop]: === Iteration 140 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:01,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:01,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1890953693, now seen corresponding path program 126 times [2021-05-06 12:08:01,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:01,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655660135] [2021-05-06 12:08:01,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:01,293 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:01,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:01,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:01,321 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:01,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,337 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:01,337 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,338 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:01,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:01,364 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:01,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,374 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:01,378 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:01,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:01,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:01,405 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:01,417 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,419 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:01,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:01,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:01,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:01,446 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:01,456 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:01,457 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:01,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:01,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:01,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:01,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:01,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:01,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:01,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:02,706 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:02,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655660135] [2021-05-06 12:08:02,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1655660135] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:02,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:02,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:08:02,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132150943] [2021-05-06 12:08:02,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:08:02,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:02,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:08:02,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1252, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:08:02,707 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:04,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:04,019 INFO L93 Difference]: Finished difference Result 506 states and 602 transitions. [2021-05-06 12:08:04,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:08:04,020 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:04,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:04,020 INFO L225 Difference]: With dead ends: 506 [2021-05-06 12:08:04,020 INFO L226 Difference]: Without dead ends: 347 [2021-05-06 12:08:04,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 1221.0ms TimeCoverageRelationStatistics Valid=164, Invalid=1396, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:08:04,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-05-06 12:08:04,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 292. [2021-05-06 12:08:04,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:04,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:04,261 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:04,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:04,261 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:04,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:04,261 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:04,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:04,261 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:04,261 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:04,261 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable634 [2021-05-06 12:08:04,261 INFO L428 AbstractCegarLoop]: === Iteration 141 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:04,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:04,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1980366881, now seen corresponding path program 127 times [2021-05-06 12:08:04,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:04,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575318735] [2021-05-06 12:08:04,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:04,267 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:04,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:04,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:04,297 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:04,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,312 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:04,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:04,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:04,343 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:04,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,353 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:04,356 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:04,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,368 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:04,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:04,385 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:04,397 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,401 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:04,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:04,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:04,431 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:04,440 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,441 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:04,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:04,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:04,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:04,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:04,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:04,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:04,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:05,719 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:05,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575318735] [2021-05-06 12:08:05,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [575318735] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:05,720 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:05,720 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:08:05,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149038451] [2021-05-06 12:08:05,720 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:08:05,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:05,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:08:05,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1321, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:08:05,720 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:07,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:07,000 INFO L93 Difference]: Finished difference Result 503 states and 599 transitions. [2021-05-06 12:08:07,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:08:07,000 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:07,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:07,001 INFO L225 Difference]: With dead ends: 503 [2021-05-06 12:08:07,001 INFO L226 Difference]: Without dead ends: 344 [2021-05-06 12:08:07,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 771 ImplicationChecksByTransitivity, 1237.8ms TimeCoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:08:07,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-05-06 12:08:07,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 292. [2021-05-06 12:08:07,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:07,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:07,259 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:07,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:07,259 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:07,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:07,259 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:07,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:07,260 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:07,260 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:07,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable639 [2021-05-06 12:08:07,260 INFO L428 AbstractCegarLoop]: === Iteration 142 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:07,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:07,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1285241117, now seen corresponding path program 128 times [2021-05-06 12:08:07,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:07,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372313477] [2021-05-06 12:08:07,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:07,267 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:07,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:07,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:07,294 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:07,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:07,308 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:07,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:07,329 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:07,336 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:07,345 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:07,346 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:07,348 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:07,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:07,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:07,375 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:07,386 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:07,388 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:07,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:07,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:07,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:07,416 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:07,425 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:07,426 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:07,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:07,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:07,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:07,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:07,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:07,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:07,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:08,728 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:08,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [372313477] [2021-05-06 12:08:08,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [372313477] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:08,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:08,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:08:08,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608759160] [2021-05-06 12:08:08,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:08:08,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:08,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:08:08,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1392, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:08:08,729 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:10,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:10,089 INFO L93 Difference]: Finished difference Result 500 states and 596 transitions. [2021-05-06 12:08:10,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:08:10,089 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:10,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:10,090 INFO L225 Difference]: With dead ends: 500 [2021-05-06 12:08:10,090 INFO L226 Difference]: Without dead ends: 341 [2021-05-06 12:08:10,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 23 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 1240.7ms TimeCoverageRelationStatistics Valid=178, Invalid=1544, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:08:10,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-05-06 12:08:10,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 292. [2021-05-06 12:08:10,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:10,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:10,335 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:10,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:10,335 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:10,335 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:10,335 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:10,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:10,336 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:10,336 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:10,336 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable644 [2021-05-06 12:08:10,336 INFO L428 AbstractCegarLoop]: === Iteration 143 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:10,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:10,336 INFO L82 PathProgramCache]: Analyzing trace with hash 441235615, now seen corresponding path program 129 times [2021-05-06 12:08:10,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:10,336 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166947107] [2021-05-06 12:08:10,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:10,350 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:10,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:10,371 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:10,379 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:10,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:10,398 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:10,398 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:10,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:10,425 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:10,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:10,435 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:10,437 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:10,448 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:10,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:10,465 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:10,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:10,478 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:10,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:10,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:10,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:10,507 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:10,517 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:10,517 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:10,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:10,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:10,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:10,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:10,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:10,620 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:10,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:11,810 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:11,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166947107] [2021-05-06 12:08:11,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [166947107] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:11,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:11,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:08:11,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464633873] [2021-05-06 12:08:11,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:08:11,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:11,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:08:11,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1465, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:08:11,811 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:13,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:13,015 INFO L93 Difference]: Finished difference Result 497 states and 593 transitions. [2021-05-06 12:08:13,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:08:13,016 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:13,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:13,016 INFO L225 Difference]: With dead ends: 497 [2021-05-06 12:08:13,017 INFO L226 Difference]: Without dead ends: 338 [2021-05-06 12:08:13,017 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 845 ImplicationChecksByTransitivity, 1261.6ms TimeCoverageRelationStatistics Valid=185, Invalid=1621, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:08:13,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-05-06 12:08:13,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 292. [2021-05-06 12:08:13,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:13,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:13,262 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:13,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:13,263 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:13,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:13,263 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:13,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:13,263 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:13,263 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:13,263 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable649 [2021-05-06 12:08:13,263 INFO L428 AbstractCegarLoop]: === Iteration 144 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:13,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:13,263 INFO L82 PathProgramCache]: Analyzing trace with hash 715995229, now seen corresponding path program 130 times [2021-05-06 12:08:13,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:13,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673745703] [2021-05-06 12:08:13,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:13,270 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:13,270 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:13,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:13,296 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:13,307 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,310 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:13,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,324 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:13,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:13,343 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:13,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,353 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:13,355 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:13,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:13,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:13,382 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:13,394 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,396 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:13,405 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,406 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:13,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:13,419 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:13,426 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:13,436 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:13,437 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:13,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:13,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:13,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:13,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:13,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:13,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:13,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:14,729 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:14,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673745703] [2021-05-06 12:08:14,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1673745703] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:14,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:14,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:08:14,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997474186] [2021-05-06 12:08:14,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:08:14,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:14,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:08:14,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1540, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:08:14,730 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:15,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:15,973 INFO L93 Difference]: Finished difference Result 494 states and 590 transitions. [2021-05-06 12:08:15,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:08:15,973 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:15,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:15,974 INFO L225 Difference]: With dead ends: 494 [2021-05-06 12:08:15,974 INFO L226 Difference]: Without dead ends: 335 [2021-05-06 12:08:15,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 1264.8ms TimeCoverageRelationStatistics Valid=192, Invalid=1700, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:08:15,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-05-06 12:08:16,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 292. [2021-05-06 12:08:16,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:16,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:16,221 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:16,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:16,222 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:16,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:16,222 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:16,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:16,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:16,222 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:16,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable654 [2021-05-06 12:08:16,222 INFO L428 AbstractCegarLoop]: === Iteration 145 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:16,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:16,222 INFO L82 PathProgramCache]: Analyzing trace with hash 2102198623, now seen corresponding path program 131 times [2021-05-06 12:08:16,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:16,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889156119] [2021-05-06 12:08:16,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:16,228 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:16,239 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:16,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:16,257 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:16,268 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:16,270 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:16,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:16,292 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:16,299 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:16,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:16,315 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:16,318 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:16,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,319 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,327 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:16,329 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:16,347 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:16,361 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:16,363 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:16,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:16,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:16,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:16,392 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:16,402 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:16,403 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:16,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:16,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:16,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:16,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:16,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:16,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:16,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:17,725 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:17,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889156119] [2021-05-06 12:08:17,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [889156119] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:17,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:17,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:08:17,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549728370] [2021-05-06 12:08:17,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:08:17,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:17,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:08:17,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1617, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:08:17,726 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:19,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:19,029 INFO L93 Difference]: Finished difference Result 491 states and 587 transitions. [2021-05-06 12:08:19,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:08:19,029 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:19,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:19,030 INFO L225 Difference]: With dead ends: 491 [2021-05-06 12:08:19,030 INFO L226 Difference]: Without dead ends: 332 [2021-05-06 12:08:19,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 864 ImplicationChecksByTransitivity, 1294.2ms TimeCoverageRelationStatistics Valid=199, Invalid=1781, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:08:19,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-05-06 12:08:19,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 292. [2021-05-06 12:08:19,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:19,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:19,278 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:19,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:19,278 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:19,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:19,278 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:19,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:19,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:19,278 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:19,278 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable659 [2021-05-06 12:08:19,278 INFO L428 AbstractCegarLoop]: === Iteration 146 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:19,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:19,279 INFO L82 PathProgramCache]: Analyzing trace with hash -2130729059, now seen corresponding path program 132 times [2021-05-06 12:08:19,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:19,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140717024] [2021-05-06 12:08:19,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:19,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:19,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:19,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:19,321 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:19,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:19,335 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:19,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:19,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:19,363 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:19,376 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:19,377 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:19,379 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:19,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:19,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:19,407 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:19,418 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:19,421 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:19,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:19,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:19,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:19,455 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:19,465 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:19,466 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:19,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:19,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:19,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:19,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:19,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:19,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:19,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:20,824 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:20,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140717024] [2021-05-06 12:08:20,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [140717024] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:20,824 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:20,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:08:20,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453382179] [2021-05-06 12:08:20,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:08:20,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:20,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:08:20,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1696, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:08:20,825 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:22,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:22,198 INFO L93 Difference]: Finished difference Result 488 states and 584 transitions. [2021-05-06 12:08:22,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:08:22,198 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:22,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:22,199 INFO L225 Difference]: With dead ends: 488 [2021-05-06 12:08:22,199 INFO L226 Difference]: Without dead ends: 329 [2021-05-06 12:08:22,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 1330.4ms TimeCoverageRelationStatistics Valid=206, Invalid=1864, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:08:22,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-05-06 12:08:22,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 292. [2021-05-06 12:08:22,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:22,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:22,450 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:22,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:22,450 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:22,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:22,450 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:22,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:22,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:22,450 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:22,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable664 [2021-05-06 12:08:22,450 INFO L428 AbstractCegarLoop]: === Iteration 147 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:22,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:22,451 INFO L82 PathProgramCache]: Analyzing trace with hash 358799903, now seen corresponding path program 133 times [2021-05-06 12:08:22,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:22,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389018056] [2021-05-06 12:08:22,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:22,458 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:22,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:22,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:22,487 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:22,498 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:22,501 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:22,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:22,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:22,530 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:22,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:22,541 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:22,543 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:22,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:22,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:22,570 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:22,582 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:22,584 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:22,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,585 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:22,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:22,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:22,612 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:22,621 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:22,622 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:22,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:22,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:22,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:22,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:22,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:22,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:22,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:24,034 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:24,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389018056] [2021-05-06 12:08:24,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [389018056] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:24,035 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:24,035 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:08:24,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430147756] [2021-05-06 12:08:24,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:08:24,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:24,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:08:24,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1777, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:08:24,035 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 43 states, 43 states have (on average 1.558139534883721) internal successors, (67), 41 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:25,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:25,210 INFO L93 Difference]: Finished difference Result 485 states and 581 transitions. [2021-05-06 12:08:25,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:08:25,210 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.558139534883721) internal successors, (67), 41 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:25,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:25,210 INFO L225 Difference]: With dead ends: 485 [2021-05-06 12:08:25,210 INFO L226 Difference]: Without dead ends: 326 [2021-05-06 12:08:25,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 1384.8ms TimeCoverageRelationStatistics Valid=213, Invalid=1949, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:08:25,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-05-06 12:08:25,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2021-05-06 12:08:25,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:25,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:25,463 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:25,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:25,463 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:25,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.558139534883721) internal successors, (67), 41 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:25,463 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:25,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:25,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:25,463 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:25,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable669 [2021-05-06 12:08:25,464 INFO L428 AbstractCegarLoop]: === Iteration 148 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:25,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:25,464 INFO L82 PathProgramCache]: Analyzing trace with hash -458848547, now seen corresponding path program 134 times [2021-05-06 12:08:25,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:25,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2147299654] [2021-05-06 12:08:25,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:25,469 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:25,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:25,480 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:25,496 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:25,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:25,510 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:25,510 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,520 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:25,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:25,536 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:25,546 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:25,547 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:25,549 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:25,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:25,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:25,575 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:25,586 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:25,588 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:25,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:25,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:25,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:25,615 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:25,625 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:25,626 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:25,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:25,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:25,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:25,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:25,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:25,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:25,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:27,067 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:27,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2147299654] [2021-05-06 12:08:27,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2147299654] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:27,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:27,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:08:27,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23618349] [2021-05-06 12:08:27,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:08:27,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:27,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:08:27,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=1860, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:08:27,068 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 42 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:28,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:28,429 INFO L93 Difference]: Finished difference Result 482 states and 578 transitions. [2021-05-06 12:08:28,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:08:28,429 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 42 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:28,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:28,430 INFO L225 Difference]: With dead ends: 482 [2021-05-06 12:08:28,430 INFO L226 Difference]: Without dead ends: 323 [2021-05-06 12:08:28,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 1409.9ms TimeCoverageRelationStatistics Valid=220, Invalid=2036, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:08:28,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-05-06 12:08:28,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 292. [2021-05-06 12:08:28,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:28,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:28,687 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:28,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:28,687 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:28,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 42 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:28,687 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:28,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:28,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:28,687 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:28,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable674 [2021-05-06 12:08:28,687 INFO L428 AbstractCegarLoop]: === Iteration 149 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:28,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:28,688 INFO L82 PathProgramCache]: Analyzing trace with hash -2047196449, now seen corresponding path program 135 times [2021-05-06 12:08:28,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:28,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802570994] [2021-05-06 12:08:28,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:28,693 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:28,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:28,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:28,719 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:28,730 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,733 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:28,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:28,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:28,760 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:28,770 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,770 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:28,772 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:28,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:28,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:28,799 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:28,810 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,812 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:28,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:28,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:28,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:28,839 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:28,849 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:28,849 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:28,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:28,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:28,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:28,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:28,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:28,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:28,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:30,304 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:30,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802570994] [2021-05-06 12:08:30,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1802570994] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:30,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:30,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:08:30,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848394425] [2021-05-06 12:08:30,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:08:30,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:30,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:08:30,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1945, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:08:30,306 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 43 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:31,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:31,650 INFO L93 Difference]: Finished difference Result 480 states and 576 transitions. [2021-05-06 12:08:31,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:08:31,650 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 43 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:31,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:31,651 INFO L225 Difference]: With dead ends: 480 [2021-05-06 12:08:31,651 INFO L226 Difference]: Without dead ends: 321 [2021-05-06 12:08:31,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 794 ImplicationChecksByTransitivity, 1445.5ms TimeCoverageRelationStatistics Valid=227, Invalid=2125, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:08:31,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2021-05-06 12:08:31,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 292. [2021-05-06 12:08:31,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 277 states have (on average 1.1985559566787003) internal successors, (332), 280 states have internal predecessors, (332), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:31,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 349 transitions. [2021-05-06 12:08:31,907 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 349 transitions. Word has length 73 [2021-05-06 12:08:31,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:31,907 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 349 transitions. [2021-05-06 12:08:31,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 43 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:31,907 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 349 transitions. [2021-05-06 12:08:31,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:08:31,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:31,907 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:31,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable679 [2021-05-06 12:08:31,908 INFO L428 AbstractCegarLoop]: === Iteration 150 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:31,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:31,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1236653597, now seen corresponding path program 136 times [2021-05-06 12:08:31,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:31,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354671313] [2021-05-06 12:08:31,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:31,913 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:31,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:31,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:31,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:31,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:31,940 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:31,952 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:31,954 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:31,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:31,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:31,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:31,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:31,987 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:31,998 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:31,998 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:32,000 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:32,000 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:32,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:32,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:32,029 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:32,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:32,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:32,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:32,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:32,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:32,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:32,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:32,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:33,634 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:33,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354671313] [2021-05-06 12:08:33,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [354671313] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:33,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:33,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:08:33,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313378768] [2021-05-06 12:08:33,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:08:33,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:33,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:08:33,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2032, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:08:33,635 INFO L87 Difference]: Start difference. First operand 292 states and 349 transitions. Second operand has 46 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 44 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:34,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:34,815 INFO L93 Difference]: Finished difference Result 491 states and 591 transitions. [2021-05-06 12:08:34,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:08:34,815 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 44 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2021-05-06 12:08:34,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:34,815 INFO L225 Difference]: With dead ends: 491 [2021-05-06 12:08:34,815 INFO L226 Difference]: Without dead ends: 321 [2021-05-06 12:08:34,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 1544.3ms TimeCoverageRelationStatistics Valid=234, Invalid=2216, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:08:34,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2021-05-06 12:08:35,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 295. [2021-05-06 12:08:35,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 280 states have (on average 1.2) internal successors, (336), 283 states have internal predecessors, (336), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:35,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 353 transitions. [2021-05-06 12:08:35,068 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 353 transitions. Word has length 73 [2021-05-06 12:08:35,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:35,068 INFO L480 AbstractCegarLoop]: Abstraction has 295 states and 353 transitions. [2021-05-06 12:08:35,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 44 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:35,068 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 353 transitions. [2021-05-06 12:08:35,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 12:08:35,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:35,068 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:35,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable683 [2021-05-06 12:08:35,068 INFO L428 AbstractCegarLoop]: === Iteration 151 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:35,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:35,069 INFO L82 PathProgramCache]: Analyzing trace with hash 327099381, now seen corresponding path program 7 times [2021-05-06 12:08:35,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:35,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443278836] [2021-05-06 12:08:35,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:35,083 WARN L240 tifierPushTermWalker]: treesize reduction 56, result has 57.9 percent of original size [2021-05-06 12:08:35,119 WARN L245 tifierPushTermWalker]: treesize reduction 56, result has 57.9 percent of original size 77 [2021-05-06 12:08:35,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:35,152 WARN L240 tifierPushTermWalker]: treesize reduction 66, result has 53.8 percent of original size [2021-05-06 12:08:35,188 WARN L245 tifierPushTermWalker]: treesize reduction 66, result has 53.8 percent of original size 77 [2021-05-06 12:08:35,215 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:35,216 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:35,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:35,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:35,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:35,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:35,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:35,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:35,488 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:35,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443278836] [2021-05-06 12:08:35,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [443278836] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:35,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:35,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:08:35,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509378413] [2021-05-06 12:08:35,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:08:35,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:35,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:08:35,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:08:35,489 INFO L87 Difference]: Start difference. First operand 295 states and 353 transitions. Second operand has 21 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:08:36,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:36,260 INFO L93 Difference]: Finished difference Result 572 states and 682 transitions. [2021-05-06 12:08:36,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:08:36,260 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 75 [2021-05-06 12:08:36,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:36,261 INFO L225 Difference]: With dead ends: 572 [2021-05-06 12:08:36,261 INFO L226 Difference]: Without dead ends: 404 [2021-05-06 12:08:36,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 24 SyntacticMatches, 14 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 329.2ms TimeCoverageRelationStatistics Valid=244, Invalid=568, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:08:36,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-05-06 12:08:36,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 313. [2021-05-06 12:08:36,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 298 states have (on average 1.1979865771812082) internal successors, (357), 301 states have internal predecessors, (357), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:36,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 374 transitions. [2021-05-06 12:08:36,520 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 374 transitions. Word has length 75 [2021-05-06 12:08:36,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:36,521 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 374 transitions. [2021-05-06 12:08:36,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:08:36,521 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 374 transitions. [2021-05-06 12:08:36,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:36,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:36,521 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:36,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable684 [2021-05-06 12:08:36,521 INFO L428 AbstractCegarLoop]: === Iteration 152 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:36,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:36,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1182482172, now seen corresponding path program 137 times [2021-05-06 12:08:36,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:36,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651220710] [2021-05-06 12:08:36,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:36,527 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:36,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:36,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:36,557 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:36,569 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,571 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:36,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:36,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:36,600 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:36,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:36,612 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:36,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:36,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:36,641 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:36,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,655 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:36,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:36,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:36,684 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:36,694 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,695 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:36,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:36,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:36,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:36,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:36,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:36,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:36,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:38,044 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:38,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651220710] [2021-05-06 12:08:38,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1651220710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:38,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:38,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:08:38,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177596933] [2021-05-06 12:08:38,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:08:38,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:38,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:08:38,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=999, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:08:38,045 INFO L87 Difference]: Start difference. First operand 313 states and 374 transitions. Second operand has 32 states, 32 states have (on average 2.1875) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:39,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:39,403 INFO L93 Difference]: Finished difference Result 563 states and 666 transitions. [2021-05-06 12:08:39,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:08:39,404 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:39,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:39,404 INFO L225 Difference]: With dead ends: 563 [2021-05-06 12:08:39,404 INFO L226 Difference]: Without dead ends: 386 [2021-05-06 12:08:39,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1313.9ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:08:39,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-05-06 12:08:39,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 316. [2021-05-06 12:08:39,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:39,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:39,691 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:39,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:39,691 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:39,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:39,691 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:39,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:39,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:39,692 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:39,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable689 [2021-05-06 12:08:39,692 INFO L428 AbstractCegarLoop]: === Iteration 153 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:39,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:39,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1743181950, now seen corresponding path program 138 times [2021-05-06 12:08:39,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:39,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301955133] [2021-05-06 12:08:39,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:39,700 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:39,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:39,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:39,738 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:39,750 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:39,753 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:39,754 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,754 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:39,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:39,780 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:39,790 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:39,791 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:39,798 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:39,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:39,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:39,828 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:39,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:39,845 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:39,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:39,856 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:39,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:39,876 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:39,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:39,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:39,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:39,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:39,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:39,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:39,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:39,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:39,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:41,199 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:41,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301955133] [2021-05-06 12:08:41,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1301955133] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:41,199 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:41,199 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:08:41,199 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996121703] [2021-05-06 12:08:41,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:08:41,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:41,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:08:41,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:08:41,200 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:42,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:42,615 INFO L93 Difference]: Finished difference Result 566 states and 669 transitions. [2021-05-06 12:08:42,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:08:42,616 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:42,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:42,616 INFO L225 Difference]: With dead ends: 566 [2021-05-06 12:08:42,616 INFO L226 Difference]: Without dead ends: 389 [2021-05-06 12:08:42,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 1260.6ms TimeCoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:08:42,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-05-06 12:08:42,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 316. [2021-05-06 12:08:42,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:42,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:42,916 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:42,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:42,916 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:42,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:42,916 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:42,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:42,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:42,916 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:42,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable694 [2021-05-06 12:08:42,916 INFO L428 AbstractCegarLoop]: === Iteration 154 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:42,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:42,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1783856700, now seen corresponding path program 139 times [2021-05-06 12:08:42,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:42,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241570235] [2021-05-06 12:08:42,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:42,922 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:42,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:42,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:42,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:42,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:42,948 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:42,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:42,962 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:42,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:42,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:42,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:42,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:42,989 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:42,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:42,999 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:43,006 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:43,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:43,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:43,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:43,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:43,035 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:43,047 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:43,049 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:43,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:43,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:43,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:43,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:43,077 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:43,087 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:43,088 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:43,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:43,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:43,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:43,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:43,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:43,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:44,390 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:44,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241570235] [2021-05-06 12:08:44,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1241570235] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:44,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:44,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:08:44,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353863647] [2021-05-06 12:08:44,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:08:44,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:44,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:08:44,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1123, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:08:44,391 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:45,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:45,853 INFO L93 Difference]: Finished difference Result 563 states and 666 transitions. [2021-05-06 12:08:45,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:08:45,853 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:45,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:45,854 INFO L225 Difference]: With dead ends: 563 [2021-05-06 12:08:45,854 INFO L226 Difference]: Without dead ends: 386 [2021-05-06 12:08:45,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1273.9ms TimeCoverageRelationStatistics Valid=147, Invalid=1259, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:08:45,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-05-06 12:08:46,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 316. [2021-05-06 12:08:46,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:46,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:46,153 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:46,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:46,153 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:46,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:46,153 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:46,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:46,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:46,154 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:46,154 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable699 [2021-05-06 12:08:46,154 INFO L428 AbstractCegarLoop]: === Iteration 155 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:46,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:46,154 INFO L82 PathProgramCache]: Analyzing trace with hash -2067209922, now seen corresponding path program 140 times [2021-05-06 12:08:46,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:46,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622001240] [2021-05-06 12:08:46,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:46,160 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:46,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:46,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:46,186 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:46,198 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:46,200 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:46,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,210 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:46,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:46,228 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:46,238 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:46,239 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:46,241 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:46,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:46,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:46,270 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:46,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:46,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:46,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:46,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:46,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:46,316 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:46,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:46,327 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:46,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:46,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:46,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:46,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:46,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:46,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:46,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:47,697 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:47,697 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622001240] [2021-05-06 12:08:47,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [622001240] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:47,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:47,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:08:47,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593946444] [2021-05-06 12:08:47,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:08:47,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:47,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:08:47,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1188, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:08:47,698 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:49,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:49,328 INFO L93 Difference]: Finished difference Result 560 states and 663 transitions. [2021-05-06 12:08:49,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:08:49,328 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:49,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:49,329 INFO L225 Difference]: With dead ends: 560 [2021-05-06 12:08:49,329 INFO L226 Difference]: Without dead ends: 383 [2021-05-06 12:08:49,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 1324.8ms TimeCoverageRelationStatistics Valid=154, Invalid=1328, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:08:49,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-05-06 12:08:49,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 316. [2021-05-06 12:08:49,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:49,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:49,638 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:49,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:49,638 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:49,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:49,638 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:49,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:49,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:49,638 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:49,638 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable704 [2021-05-06 12:08:49,638 INFO L428 AbstractCegarLoop]: === Iteration 156 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:49,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:49,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1746677116, now seen corresponding path program 141 times [2021-05-06 12:08:49,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:49,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644074059] [2021-05-06 12:08:49,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:49,645 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:49,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:49,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:49,672 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:49,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:49,686 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:49,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:49,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:49,721 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:49,730 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:49,731 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:49,733 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:49,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,745 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:49,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:49,760 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:49,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:49,774 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:49,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:49,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:49,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:49,801 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:49,810 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:49,811 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:49,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:49,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:49,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:49,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:49,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:49,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:49,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:51,175 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:51,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644074059] [2021-05-06 12:08:51,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [644074059] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:51,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:51,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:08:51,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197839417] [2021-05-06 12:08:51,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:08:51,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:51,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:08:51,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1255, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:08:51,176 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:52,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:52,662 INFO L93 Difference]: Finished difference Result 557 states and 660 transitions. [2021-05-06 12:08:52,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:08:52,662 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:52,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:52,663 INFO L225 Difference]: With dead ends: 557 [2021-05-06 12:08:52,663 INFO L226 Difference]: Without dead ends: 380 [2021-05-06 12:08:52,663 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 1350.1ms TimeCoverageRelationStatistics Valid=161, Invalid=1399, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:08:52,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-05-06 12:08:52,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 316. [2021-05-06 12:08:52,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:52,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:52,981 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:52,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:52,982 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:52,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:52,982 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:52,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:52,982 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:52,982 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:52,982 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable709 [2021-05-06 12:08:52,982 INFO L428 AbstractCegarLoop]: === Iteration 157 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:52,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:52,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1393588734, now seen corresponding path program 142 times [2021-05-06 12:08:52,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:52,983 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359091924] [2021-05-06 12:08:52,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:52,991 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:53,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:53,013 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:53,021 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:53,033 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:53,035 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:53,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:53,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:53,064 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:53,075 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:53,075 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:53,077 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:53,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:53,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:53,108 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:53,120 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:53,122 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:53,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:53,133 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:53,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:53,150 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:53,160 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:53,161 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:53,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:53,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:53,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:53,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:53,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:53,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:53,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:54,514 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:54,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359091924] [2021-05-06 12:08:54,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1359091924] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:54,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:54,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:08:54,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185383350] [2021-05-06 12:08:54,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:08:54,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:54,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:08:54,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1324, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:08:54,515 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:56,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:56,003 INFO L93 Difference]: Finished difference Result 554 states and 657 transitions. [2021-05-06 12:08:56,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:08:56,003 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:56,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:56,004 INFO L225 Difference]: With dead ends: 554 [2021-05-06 12:08:56,004 INFO L226 Difference]: Without dead ends: 377 [2021-05-06 12:08:56,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 1322.1ms TimeCoverageRelationStatistics Valid=168, Invalid=1472, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:08:56,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-05-06 12:08:56,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 316. [2021-05-06 12:08:56,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:56,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:56,333 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:56,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:56,333 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:56,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:56,334 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:56,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:56,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:56,334 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:56,334 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable714 [2021-05-06 12:08:56,334 INFO L428 AbstractCegarLoop]: === Iteration 158 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:56,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:56,334 INFO L82 PathProgramCache]: Analyzing trace with hash -655799108, now seen corresponding path program 143 times [2021-05-06 12:08:56,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:56,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323236745] [2021-05-06 12:08:56,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:56,341 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:56,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:56,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:56,367 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:56,379 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:56,381 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:56,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:56,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:56,413 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:56,423 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:56,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:56,426 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:56,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:56,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:56,457 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:56,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:56,472 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:56,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:56,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:56,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:56,500 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:56,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:56,511 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:56,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:56,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:56,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:56,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:56,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:56,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:56,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:57,850 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:57,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323236745] [2021-05-06 12:08:57,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1323236745] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:57,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:57,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:08:57,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030121275] [2021-05-06 12:08:57,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:08:57,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:57,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:08:57,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1395, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:08:57,851 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:59,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:59,276 INFO L93 Difference]: Finished difference Result 551 states and 654 transitions. [2021-05-06 12:08:59,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:08:59,276 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:08:59,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:59,277 INFO L225 Difference]: With dead ends: 551 [2021-05-06 12:08:59,277 INFO L226 Difference]: Without dead ends: 374 [2021-05-06 12:08:59,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 1311.2ms TimeCoverageRelationStatistics Valid=175, Invalid=1547, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:08:59,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-05-06 12:08:59,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 316. [2021-05-06 12:08:59,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:08:59,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:08:59,615 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:08:59,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:59,615 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:08:59,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:08:59,615 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:08:59,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:08:59,615 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:59,615 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:59,615 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable719 [2021-05-06 12:08:59,615 INFO L428 AbstractCegarLoop]: === Iteration 159 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:59,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:59,616 INFO L82 PathProgramCache]: Analyzing trace with hash -232152386, now seen corresponding path program 144 times [2021-05-06 12:08:59,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:59,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880342703] [2021-05-06 12:08:59,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:59,621 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:08:59,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:59,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:59,648 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:08:59,660 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,662 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:08:59,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,680 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:59,683 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:59,690 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:08:59,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:59,702 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:08:59,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:59,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:59,729 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:08:59,740 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,742 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:08:59,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:59,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:08:59,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:08:59,770 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:08:59,780 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:59,781 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:59,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:59,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:59,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:59,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:08:59,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:59,884 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:59,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:01,123 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:01,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880342703] [2021-05-06 12:09:01,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [880342703] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:01,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:01,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:09:01,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379634033] [2021-05-06 12:09:01,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:09:01,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:01,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:09:01,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1468, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:09:01,124 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:02,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:02,676 INFO L93 Difference]: Finished difference Result 548 states and 651 transitions. [2021-05-06 12:09:02,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:09:02,677 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:02,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:02,677 INFO L225 Difference]: With dead ends: 548 [2021-05-06 12:09:02,677 INFO L226 Difference]: Without dead ends: 371 [2021-05-06 12:09:02,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 7 SyntacticMatches, 25 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 1309.3ms TimeCoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:09:02,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-05-06 12:09:02,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 316. [2021-05-06 12:09:02,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:02,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:02,995 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:02,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:02,995 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:02,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:02,995 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:02,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:02,996 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:02,996 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:02,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable724 [2021-05-06 12:09:02,996 INFO L428 AbstractCegarLoop]: === Iteration 160 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:02,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:02,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1261511684, now seen corresponding path program 145 times [2021-05-06 12:09:02,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:02,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241345111] [2021-05-06 12:09:02,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:03,001 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:03,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:03,012 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:03,028 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:03,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,042 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:03,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:03,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:03,070 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:03,079 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,080 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:03,082 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:03,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:03,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:03,108 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:03,120 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,122 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:03,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:03,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:03,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:03,154 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:03,163 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:03,164 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:03,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:03,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:03,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:03,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:03,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:03,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:04,589 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:04,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241345111] [2021-05-06 12:09:04,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1241345111] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:04,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:04,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:09:04,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826420393] [2021-05-06 12:09:04,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:09:04,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:04,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:09:04,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1543, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:09:04,590 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 40 states, 40 states have (on average 1.75) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:06,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:06,311 INFO L93 Difference]: Finished difference Result 545 states and 648 transitions. [2021-05-06 12:09:06,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:09:06,311 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:06,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:06,312 INFO L225 Difference]: With dead ends: 545 [2021-05-06 12:09:06,312 INFO L226 Difference]: Without dead ends: 368 [2021-05-06 12:09:06,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 1396.1ms TimeCoverageRelationStatistics Valid=189, Invalid=1703, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:09:06,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-05-06 12:09:06,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 316. [2021-05-06 12:09:06,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:06,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:06,631 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:06,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:06,631 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:06,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:06,631 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:06,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:06,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:06,631 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:06,631 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable729 [2021-05-06 12:09:06,631 INFO L428 AbstractCegarLoop]: === Iteration 161 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:06,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:06,632 INFO L82 PathProgramCache]: Analyzing trace with hash -2105517186, now seen corresponding path program 146 times [2021-05-06 12:09:06,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:06,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63652699] [2021-05-06 12:09:06,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:06,637 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:06,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:06,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:06,663 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:06,675 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:06,678 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:06,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,679 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:06,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:06,715 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:06,728 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:06,729 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:06,731 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:06,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:06,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:06,769 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:06,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:06,783 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:06,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:06,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:06,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:06,812 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:06,825 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:06,826 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:06,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:06,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:06,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:06,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:06,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:06,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:06,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:08,222 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:08,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63652699] [2021-05-06 12:09:08,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [63652699] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:08,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:08,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:09:08,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093594082] [2021-05-06 12:09:08,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:09:08,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:08,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:09:08,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:09:08,223 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:09,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:09,825 INFO L93 Difference]: Finished difference Result 542 states and 645 transitions. [2021-05-06 12:09:09,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:09:09,825 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:09,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:09,826 INFO L225 Difference]: With dead ends: 542 [2021-05-06 12:09:09,826 INFO L226 Difference]: Without dead ends: 365 [2021-05-06 12:09:09,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 7 SyntacticMatches, 23 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 911 ImplicationChecksByTransitivity, 1366.8ms TimeCoverageRelationStatistics Valid=196, Invalid=1784, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:09:09,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-05-06 12:09:10,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 316. [2021-05-06 12:09:10,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:10,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:10,149 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:10,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:10,149 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:10,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:10,149 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:10,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:10,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:10,150 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:10,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable734 [2021-05-06 12:09:10,150 INFO L428 AbstractCegarLoop]: === Iteration 162 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:10,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:10,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1830757572, now seen corresponding path program 147 times [2021-05-06 12:09:10,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:10,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055726917] [2021-05-06 12:09:10,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:10,156 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:10,167 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,168 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:10,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:10,191 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:10,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,205 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:10,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:10,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:10,233 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:10,243 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,244 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:10,246 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:10,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:10,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:10,274 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:10,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:10,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:10,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:10,319 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:10,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,330 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:10,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:10,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:10,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:10,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:11,733 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:11,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055726917] [2021-05-06 12:09:11,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2055726917] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:11,733 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:11,733 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:09:11,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332304554] [2021-05-06 12:09:11,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:09:11,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:11,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:09:11,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1699, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:09:11,734 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:13,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:13,280 INFO L93 Difference]: Finished difference Result 539 states and 642 transitions. [2021-05-06 12:09:13,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:09:13,280 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:13,281 INFO L225 Difference]: With dead ends: 539 [2021-05-06 12:09:13,281 INFO L226 Difference]: Without dead ends: 362 [2021-05-06 12:09:13,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1374.8ms TimeCoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:09:13,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-06 12:09:13,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 316. [2021-05-06 12:09:13,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:13,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:13,600 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:13,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:13,600 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:13,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:13,601 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:13,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:13,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:13,601 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:13,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable739 [2021-05-06 12:09:13,601 INFO L428 AbstractCegarLoop]: === Iteration 163 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:13,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:13,601 INFO L82 PathProgramCache]: Analyzing trace with hash -444554178, now seen corresponding path program 148 times [2021-05-06 12:09:13,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:13,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959563747] [2021-05-06 12:09:13,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:13,607 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:13,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:13,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:13,634 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:13,645 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:13,647 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:13,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:13,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:13,675 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:13,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:13,685 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:13,687 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:13,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:13,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:13,714 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:13,727 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:13,729 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:13,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:13,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:13,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:13,758 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:13,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:13,769 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:13,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:13,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:13,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:13,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:13,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:13,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:13,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:15,180 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:15,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959563747] [2021-05-06 12:09:15,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [959563747] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:15,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:15,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:09:15,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460485733] [2021-05-06 12:09:15,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:09:15,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:15,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:09:15,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1780, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:09:15,181 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:17,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:17,056 INFO L93 Difference]: Finished difference Result 536 states and 639 transitions. [2021-05-06 12:09:17,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:09:17,056 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:17,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:17,057 INFO L225 Difference]: With dead ends: 536 [2021-05-06 12:09:17,057 INFO L226 Difference]: Without dead ends: 359 [2021-05-06 12:09:17,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1381.8ms TimeCoverageRelationStatistics Valid=210, Invalid=1952, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:09:17,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-05-06 12:09:17,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 316. [2021-05-06 12:09:17,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:17,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:17,398 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:17,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:17,398 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:17,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:17,398 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:17,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:17,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:17,398 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:17,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable744 [2021-05-06 12:09:17,398 INFO L428 AbstractCegarLoop]: === Iteration 164 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:17,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:17,399 INFO L82 PathProgramCache]: Analyzing trace with hash -382514564, now seen corresponding path program 149 times [2021-05-06 12:09:17,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:17,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880486392] [2021-05-06 12:09:17,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:17,404 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:17,405 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,406 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:17,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:17,430 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:17,442 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:17,444 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:17,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:17,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:17,476 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:17,485 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:17,486 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:17,488 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:17,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:17,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:17,514 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:17,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:17,528 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:17,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:17,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:17,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:17,555 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:17,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:17,566 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:17,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:17,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:17,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:17,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:17,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:17,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:17,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:19,009 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:19,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880486392] [2021-05-06 12:09:19,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [880486392] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:19,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:19,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:09:19,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709206874] [2021-05-06 12:09:19,010 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:09:19,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:19,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:09:19,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1863, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:09:19,010 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:20,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:20,584 INFO L93 Difference]: Finished difference Result 533 states and 636 transitions. [2021-05-06 12:09:20,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:09:20,584 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:20,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:20,585 INFO L225 Difference]: With dead ends: 533 [2021-05-06 12:09:20,585 INFO L226 Difference]: Without dead ends: 356 [2021-05-06 12:09:20,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 8 SyntacticMatches, 19 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 1409.0ms TimeCoverageRelationStatistics Valid=217, Invalid=2039, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:09:20,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-06 12:09:20,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 316. [2021-05-06 12:09:20,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:20,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:20,910 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:20,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:20,910 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:20,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:20,910 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:20,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:20,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:20,911 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:20,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable749 [2021-05-06 12:09:20,911 INFO L428 AbstractCegarLoop]: === Iteration 165 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:20,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:20,911 INFO L82 PathProgramCache]: Analyzing trace with hash 2107014398, now seen corresponding path program 150 times [2021-05-06 12:09:20,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:20,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017752108] [2021-05-06 12:09:20,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:20,916 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:20,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:20,929 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:20,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:20,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:20,944 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:20,956 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:20,958 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:20,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:20,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:20,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:20,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:20,986 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:20,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:20,996 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:20,998 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:20,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:20,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:21,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:21,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:21,024 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:21,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:21,042 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:21,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:21,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:21,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:21,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:21,069 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:21,078 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:21,079 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:21,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:21,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:21,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:21,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:21,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:21,180 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:21,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:22,673 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:22,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017752108] [2021-05-06 12:09:22,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2017752108] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:22,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:22,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:09:22,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025284630] [2021-05-06 12:09:22,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:09:22,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:22,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:09:22,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1948, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:09:22,674 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 45 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 43 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:24,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:24,427 INFO L93 Difference]: Finished difference Result 530 states and 633 transitions. [2021-05-06 12:09:24,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:09:24,428 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 43 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:24,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:24,428 INFO L225 Difference]: With dead ends: 530 [2021-05-06 12:09:24,428 INFO L226 Difference]: Without dead ends: 353 [2021-05-06 12:09:24,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 1563.6ms TimeCoverageRelationStatistics Valid=224, Invalid=2128, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:09:24,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-05-06 12:09:24,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 316. [2021-05-06 12:09:24,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:24,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:24,755 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:24,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:24,756 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:24,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 43 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:24,756 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:24,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:24,756 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:24,756 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:24,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable754 [2021-05-06 12:09:24,756 INFO L428 AbstractCegarLoop]: === Iteration 166 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:24,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:24,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1289365948, now seen corresponding path program 151 times [2021-05-06 12:09:24,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:24,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029401701] [2021-05-06 12:09:24,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:24,762 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:24,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:24,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:24,789 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:24,801 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:24,803 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:24,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:24,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:24,830 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:24,840 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:24,840 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:24,842 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:24,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:24,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:24,870 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:24,882 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:24,884 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:24,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:24,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:24,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:24,912 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:24,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:24,922 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:24,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:25,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:25,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:25,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,435 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:26,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029401701] [2021-05-06 12:09:26,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2029401701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:26,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:26,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:09:26,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297586633] [2021-05-06 12:09:26,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:09:26,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:26,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:09:26,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=2035, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:09:26,436 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 44 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:28,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:28,153 INFO L93 Difference]: Finished difference Result 527 states and 630 transitions. [2021-05-06 12:09:28,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:09:28,153 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 44 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:28,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:28,154 INFO L225 Difference]: With dead ends: 527 [2021-05-06 12:09:28,154 INFO L226 Difference]: Without dead ends: 350 [2021-05-06 12:09:28,154 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 1486.5ms TimeCoverageRelationStatistics Valid=231, Invalid=2219, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:09:28,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-05-06 12:09:28,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 316. [2021-05-06 12:09:28,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:28,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:28,483 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:28,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:28,483 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:28,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 44 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:28,483 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:28,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:28,483 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:28,483 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:28,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable759 [2021-05-06 12:09:28,483 INFO L428 AbstractCegarLoop]: === Iteration 167 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:28,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:28,483 INFO L82 PathProgramCache]: Analyzing trace with hash -298981954, now seen corresponding path program 152 times [2021-05-06 12:09:28,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:28,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32302618] [2021-05-06 12:09:28,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:28,489 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:28,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,509 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:28,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:28,518 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:28,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:28,532 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:28,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,542 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:28,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:28,560 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:28,570 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:28,571 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:28,573 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:28,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:28,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:28,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:28,612 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:28,614 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:28,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:28,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:28,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:28,643 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:28,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:28,653 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:28,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:28,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:28,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:28,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:28,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:28,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:30,235 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:30,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32302618] [2021-05-06 12:09:30,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [32302618] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:30,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:30,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:09:30,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365283021] [2021-05-06 12:09:30,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:09:30,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:30,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:09:30,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=2124, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:09:30,236 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 45 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:31,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:31,963 INFO L93 Difference]: Finished difference Result 525 states and 628 transitions. [2021-05-06 12:09:31,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:09:31,964 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 45 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:31,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:31,964 INFO L225 Difference]: With dead ends: 525 [2021-05-06 12:09:31,964 INFO L226 Difference]: Without dead ends: 348 [2021-05-06 12:09:31,965 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 867 ImplicationChecksByTransitivity, 1548.5ms TimeCoverageRelationStatistics Valid=238, Invalid=2312, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:09:31,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-05-06 12:09:32,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 316. [2021-05-06 12:09:32,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 301 states have (on average 1.196013289036545) internal successors, (360), 304 states have internal predecessors, (360), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:32,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 377 transitions. [2021-05-06 12:09:32,289 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 377 transitions. Word has length 76 [2021-05-06 12:09:32,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:32,289 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 377 transitions. [2021-05-06 12:09:32,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 45 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:32,289 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 377 transitions. [2021-05-06 12:09:32,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:09:32,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:32,290 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:32,290 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable764 [2021-05-06 12:09:32,290 INFO L428 AbstractCegarLoop]: === Iteration 168 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:32,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:32,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1310099204, now seen corresponding path program 153 times [2021-05-06 12:09:32,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:32,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218472443] [2021-05-06 12:09:32,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:32,295 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:32,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:32,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:32,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:32,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:32,321 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:32,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:32,335 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:32,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:32,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:32,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:32,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:32,363 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:32,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:32,374 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:32,375 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:32,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:32,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:32,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:32,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:32,402 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:32,412 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:32,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:32,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:32,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:32,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:32,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:32,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:32,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:32,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:33,944 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:33,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218472443] [2021-05-06 12:09:33,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1218472443] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:33,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:33,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:09:33,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863550401] [2021-05-06 12:09:33,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:09:33,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:33,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:09:33,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=2215, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:09:33,945 INFO L87 Difference]: Start difference. First operand 316 states and 377 transitions. Second operand has 48 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 46 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:35,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:35,727 INFO L93 Difference]: Finished difference Result 536 states and 643 transitions. [2021-05-06 12:09:35,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:09:35,727 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 46 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-06 12:09:35,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:35,728 INFO L225 Difference]: With dead ends: 536 [2021-05-06 12:09:35,728 INFO L226 Difference]: Without dead ends: 348 [2021-05-06 12:09:35,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 1499.0ms TimeCoverageRelationStatistics Valid=245, Invalid=2407, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:09:35,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-05-06 12:09:36,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 319. [2021-05-06 12:09:36,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 304 states have (on average 1.1973684210526316) internal successors, (364), 307 states have internal predecessors, (364), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:36,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 381 transitions. [2021-05-06 12:09:36,076 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 381 transitions. Word has length 76 [2021-05-06 12:09:36,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:36,076 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 381 transitions. [2021-05-06 12:09:36,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 46 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:36,076 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 381 transitions. [2021-05-06 12:09:36,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:36,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:36,077 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:36,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable768 [2021-05-06 12:09:36,077 INFO L428 AbstractCegarLoop]: === Iteration 169 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:36,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:36,077 INFO L82 PathProgramCache]: Analyzing trace with hash 787799167, now seen corresponding path program 154 times [2021-05-06 12:09:36,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:36,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967277212] [2021-05-06 12:09:36,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:36,083 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:36,099 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,120 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:36,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:36,131 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:36,143 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,146 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:36,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:36,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:36,177 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:36,187 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,188 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:36,190 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:36,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:36,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:36,221 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:36,237 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,239 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:36,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:36,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:36,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:36,268 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:36,278 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:36,278 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:36,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:36,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:36,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:36,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:36,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:36,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:36,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:37,650 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:37,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967277212] [2021-05-06 12:09:37,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [967277212] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:37,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:37,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:09:37,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837528067] [2021-05-06 12:09:37,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:09:37,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:37,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:09:37,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1063, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:09:37,651 INFO L87 Difference]: Start difference. First operand 319 states and 381 transitions. Second operand has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:39,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:39,300 INFO L93 Difference]: Finished difference Result 572 states and 676 transitions. [2021-05-06 12:09:39,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:09:39,301 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:39,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:39,301 INFO L225 Difference]: With dead ends: 572 [2021-05-06 12:09:39,301 INFO L226 Difference]: Without dead ends: 395 [2021-05-06 12:09:39,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 34 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 1339.7ms TimeCoverageRelationStatistics Valid=137, Invalid=1195, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:09:39,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2021-05-06 12:09:39,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 322. [2021-05-06 12:09:39,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:39,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:09:39,704 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:09:39,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:39,704 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:09:39,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:39,704 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:09:39,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:39,705 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:39,705 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:39,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable773 [2021-05-06 12:09:39,705 INFO L428 AbstractCegarLoop]: === Iteration 170 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:39,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:39,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1467071421, now seen corresponding path program 155 times [2021-05-06 12:09:39,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:39,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110361224] [2021-05-06 12:09:39,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:39,710 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:39,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:39,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:39,736 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:39,749 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:39,751 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:39,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:39,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:39,779 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:39,789 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:39,790 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:39,801 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:39,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,816 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:39,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:39,837 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:39,851 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:39,854 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:39,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:39,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:39,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:39,990 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:40,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:40,001 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:40,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:40,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:40,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:40,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:40,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:40,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:40,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:41,382 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:41,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110361224] [2021-05-06 12:09:41,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2110361224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:41,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:41,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:09:41,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328098371] [2021-05-06 12:09:41,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:09:41,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:41,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:09:41,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1126, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:09:41,383 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:43,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:43,042 INFO L93 Difference]: Finished difference Result 575 states and 679 transitions. [2021-05-06 12:09:43,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:09:43,042 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:43,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:43,043 INFO L225 Difference]: With dead ends: 575 [2021-05-06 12:09:43,043 INFO L226 Difference]: Without dead ends: 398 [2021-05-06 12:09:43,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 34 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 1346.1ms TimeCoverageRelationStatistics Valid=144, Invalid=1262, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:09:43,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-05-06 12:09:43,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 322. [2021-05-06 12:09:43,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:43,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:09:43,423 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:09:43,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:43,423 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:09:43,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:43,423 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:09:43,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:43,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:43,423 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:43,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable778 [2021-05-06 12:09:43,423 INFO L428 AbstractCegarLoop]: === Iteration 171 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:43,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:43,424 INFO L82 PathProgramCache]: Analyzing trace with hash 2027771199, now seen corresponding path program 156 times [2021-05-06 12:09:43,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:43,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724272568] [2021-05-06 12:09:43,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:43,446 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:43,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,447 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:43,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:43,474 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:43,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:43,490 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:43,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:43,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:43,520 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:43,531 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:43,532 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:43,534 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:43,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:43,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:43,563 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:43,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:43,578 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:43,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:43,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:43,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:43,609 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:43,620 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:43,621 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:43,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:43,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:43,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:43,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:43,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:43,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:43,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:45,010 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:45,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724272568] [2021-05-06 12:09:45,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [724272568] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:45,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:45,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:09:45,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802332419] [2021-05-06 12:09:45,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:09:45,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:45,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:09:45,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1191, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:09:45,011 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:46,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:46,850 INFO L93 Difference]: Finished difference Result 572 states and 676 transitions. [2021-05-06 12:09:46,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:09:46,850 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:46,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:46,851 INFO L225 Difference]: With dead ends: 572 [2021-05-06 12:09:46,851 INFO L226 Difference]: Without dead ends: 395 [2021-05-06 12:09:46,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 1357.7ms TimeCoverageRelationStatistics Valid=151, Invalid=1331, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:09:46,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2021-05-06 12:09:47,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 322. [2021-05-06 12:09:47,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:47,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:09:47,236 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:09:47,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:47,236 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:09:47,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:47,236 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:09:47,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:47,236 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:47,236 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:47,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable783 [2021-05-06 12:09:47,236 INFO L428 AbstractCegarLoop]: === Iteration 172 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:47,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:47,237 INFO L82 PathProgramCache]: Analyzing trace with hash 2068445949, now seen corresponding path program 157 times [2021-05-06 12:09:47,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:47,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797071007] [2021-05-06 12:09:47,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:47,242 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:47,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:47,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:47,269 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:47,280 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:47,283 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:47,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:47,304 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:47,311 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:47,321 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:47,322 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:47,324 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:47,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:47,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:47,363 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:47,378 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:47,380 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:47,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:47,392 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:47,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:47,412 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:47,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:47,425 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:47,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:47,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:47,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:47,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:47,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:47,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:47,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:48,829 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:48,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797071007] [2021-05-06 12:09:48,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [797071007] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:48,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:48,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:09:48,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268365351] [2021-05-06 12:09:48,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:09:48,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:48,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:09:48,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1258, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:09:48,830 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:50,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:50,584 INFO L93 Difference]: Finished difference Result 569 states and 673 transitions. [2021-05-06 12:09:50,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:09:50,584 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:50,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:50,585 INFO L225 Difference]: With dead ends: 569 [2021-05-06 12:09:50,585 INFO L226 Difference]: Without dead ends: 392 [2021-05-06 12:09:50,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 1371.6ms TimeCoverageRelationStatistics Valid=158, Invalid=1402, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:09:50,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-06 12:09:50,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 322. [2021-05-06 12:09:50,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:50,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:09:50,982 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:09:50,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:50,982 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:09:50,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:50,982 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:09:50,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:50,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:50,983 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:50,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable788 [2021-05-06 12:09:50,983 INFO L428 AbstractCegarLoop]: === Iteration 173 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:50,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:50,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1782620673, now seen corresponding path program 158 times [2021-05-06 12:09:50,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:50,983 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591226496] [2021-05-06 12:09:50,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:50,989 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:50,989 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:50,990 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:50,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:50,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:51,016 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:51,028 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:51,031 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:51,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:51,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:51,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:51,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:51,064 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:51,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:51,075 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:51,077 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:51,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:51,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:51,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:51,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:51,108 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:51,121 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:51,123 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:51,124 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:51,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:51,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:51,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:51,152 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:51,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:51,162 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:51,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:51,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:51,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:51,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:51,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:51,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:51,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:52,599 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:52,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591226496] [2021-05-06 12:09:52,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [591226496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:52,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:52,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:09:52,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681576444] [2021-05-06 12:09:52,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:09:52,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:52,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:09:52,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:09:52,600 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:54,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:54,275 INFO L93 Difference]: Finished difference Result 566 states and 670 transitions. [2021-05-06 12:09:54,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:09:54,275 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:54,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:54,276 INFO L225 Difference]: With dead ends: 566 [2021-05-06 12:09:54,276 INFO L226 Difference]: Without dead ends: 389 [2021-05-06 12:09:54,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 1397.5ms TimeCoverageRelationStatistics Valid=165, Invalid=1475, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:09:54,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-05-06 12:09:54,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 322. [2021-05-06 12:09:54,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:54,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:09:54,667 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:09:54,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:54,667 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:09:54,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:54,667 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:09:54,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:54,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:54,668 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:54,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable793 [2021-05-06 12:09:54,668 INFO L428 AbstractCegarLoop]: === Iteration 174 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:54,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:54,668 INFO L82 PathProgramCache]: Analyzing trace with hash 2031266365, now seen corresponding path program 159 times [2021-05-06 12:09:54,668 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:54,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955518836] [2021-05-06 12:09:54,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:54,675 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:54,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:54,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:54,712 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:54,726 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:54,729 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:54,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:54,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:54,758 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:54,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:54,768 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:54,771 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:54,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,792 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:54,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:54,812 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:54,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:54,827 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:54,828 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:54,838 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:54,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:54,854 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:54,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:54,868 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:54,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:54,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:54,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:54,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:54,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:54,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:54,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:56,293 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:56,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955518836] [2021-05-06 12:09:56,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [955518836] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:56,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:56,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:09:56,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867957843] [2021-05-06 12:09:56,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:09:56,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:56,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:09:56,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1398, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:09:56,294 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:58,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:58,188 INFO L93 Difference]: Finished difference Result 563 states and 667 transitions. [2021-05-06 12:09:58,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:09:58,188 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:09:58,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:58,189 INFO L225 Difference]: With dead ends: 563 [2021-05-06 12:09:58,189 INFO L226 Difference]: Without dead ends: 386 [2021-05-06 12:09:58,190 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 29 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 838 ImplicationChecksByTransitivity, 1376.3ms TimeCoverageRelationStatistics Valid=172, Invalid=1550, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:09:58,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-05-06 12:09:58,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 322. [2021-05-06 12:09:58,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:09:58,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:09:58,649 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:09:58,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:58,649 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:09:58,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:09:58,649 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:09:58,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:09:58,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:58,649 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:58,649 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable798 [2021-05-06 12:09:58,649 INFO L428 AbstractCegarLoop]: === Iteration 175 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:58,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:58,650 INFO L82 PathProgramCache]: Analyzing trace with hash 1678177983, now seen corresponding path program 160 times [2021-05-06 12:09:58,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:58,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552873456] [2021-05-06 12:09:58,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:58,655 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:09:58,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:58,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:58,687 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:09:58,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,701 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:09:58,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:58,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:58,729 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:09:58,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,740 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:58,742 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:09:58,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,754 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:58,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:58,770 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:09:58,782 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,784 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:09:58,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:58,795 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:09:58,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:09:58,812 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:09:58,821 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:58,822 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:58,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:58,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:58,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:58,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:09:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:58,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:58,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:00,252 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:00,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552873456] [2021-05-06 12:10:00,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1552873456] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:00,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:00,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:10:00,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103686417] [2021-05-06 12:10:00,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:10:00,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:00,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:10:00,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1471, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:10:00,253 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:02,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:02,094 INFO L93 Difference]: Finished difference Result 560 states and 664 transitions. [2021-05-06 12:10:02,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:10:02,094 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:02,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:02,095 INFO L225 Difference]: With dead ends: 560 [2021-05-06 12:10:02,095 INFO L226 Difference]: Without dead ends: 383 [2021-05-06 12:10:02,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 1391.4ms TimeCoverageRelationStatistics Valid=179, Invalid=1627, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:10:02,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-05-06 12:10:02,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 322. [2021-05-06 12:10:02,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:02,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:02,523 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:02,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:02,523 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:02,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:02,524 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:02,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:02,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:02,524 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:02,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable803 [2021-05-06 12:10:02,524 INFO L428 AbstractCegarLoop]: === Iteration 176 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:02,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:02,524 INFO L82 PathProgramCache]: Analyzing trace with hash -371209859, now seen corresponding path program 161 times [2021-05-06 12:10:02,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:02,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710151415] [2021-05-06 12:10:02,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:02,530 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:02,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:02,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:02,561 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:02,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,575 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:02,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:02,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:02,601 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:02,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,612 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:02,614 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:02,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:02,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:02,641 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:02,654 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,658 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:02,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:02,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:02,683 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:02,690 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:02,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:02,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:02,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:02,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:02,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:02,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:02,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:02,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:02,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:04,179 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:04,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710151415] [2021-05-06 12:10:04,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [710151415] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:04,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:04,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:10:04,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924189670] [2021-05-06 12:10:04,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:10:04,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:04,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:10:04,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1546, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:10:04,180 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 40 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:06,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:06,205 INFO L93 Difference]: Finished difference Result 557 states and 661 transitions. [2021-05-06 12:10:06,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:10:06,205 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:06,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:06,206 INFO L225 Difference]: With dead ends: 557 [2021-05-06 12:10:06,206 INFO L226 Difference]: Without dead ends: 380 [2021-05-06 12:10:06,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 952 ImplicationChecksByTransitivity, 1446.2ms TimeCoverageRelationStatistics Valid=186, Invalid=1706, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:10:06,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-05-06 12:10:06,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 322. [2021-05-06 12:10:06,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:06,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:06,666 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:06,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:06,666 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:06,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:06,666 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:06,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:06,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:06,667 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:06,667 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable808 [2021-05-06 12:10:06,667 INFO L428 AbstractCegarLoop]: === Iteration 177 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:06,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:06,667 INFO L82 PathProgramCache]: Analyzing trace with hash 52436863, now seen corresponding path program 162 times [2021-05-06 12:10:06,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:06,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386172930] [2021-05-06 12:10:06,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:06,682 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:06,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:06,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:06,717 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:06,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:06,734 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:06,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:06,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:06,763 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:06,790 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:06,790 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:06,801 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:06,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,802 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:06,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:06,850 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:06,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:06,867 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:06,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:06,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:06,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:06,897 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:06,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:06,909 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:07,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:07,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:07,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:07,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:07,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:07,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:08,543 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:08,543 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386172930] [2021-05-06 12:10:08,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1386172930] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:08,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:08,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:10:08,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129415675] [2021-05-06 12:10:08,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:10:08,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:08,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:10:08,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1623, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:10:08,544 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:10,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:10,623 INFO L93 Difference]: Finished difference Result 554 states and 658 transitions. [2021-05-06 12:10:10,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:10:10,623 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:10,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:10,623 INFO L225 Difference]: With dead ends: 554 [2021-05-06 12:10:10,623 INFO L226 Difference]: Without dead ends: 377 [2021-05-06 12:10:10,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1592.2ms TimeCoverageRelationStatistics Valid=193, Invalid=1787, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:10:10,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-05-06 12:10:11,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 322. [2021-05-06 12:10:11,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:11,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:11,057 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:11,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:11,058 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:11,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:11,058 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:11,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:11,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:11,058 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:11,058 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable813 [2021-05-06 12:10:11,058 INFO L428 AbstractCegarLoop]: === Iteration 178 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:11,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:11,058 INFO L82 PathProgramCache]: Analyzing trace with hash -976922435, now seen corresponding path program 163 times [2021-05-06 12:10:11,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:11,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392234436] [2021-05-06 12:10:11,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:11,064 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:11,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:11,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:11,092 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:11,104 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,106 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:11,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:11,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:11,136 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:11,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,146 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:11,148 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:11,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:11,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:11,183 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:11,195 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,197 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:11,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:11,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:11,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:11,232 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:11,243 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:11,244 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:11,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:11,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:11,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:11,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:11,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:11,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:11,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:12,768 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:12,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392234436] [2021-05-06 12:10:12,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1392234436] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:12,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:12,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:10:12,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245004187] [2021-05-06 12:10:12,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:10:12,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:12,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:10:12,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1702, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:10:12,769 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:14,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:14,623 INFO L93 Difference]: Finished difference Result 551 states and 655 transitions. [2021-05-06 12:10:14,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:10:14,624 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:14,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:14,624 INFO L225 Difference]: With dead ends: 551 [2021-05-06 12:10:14,624 INFO L226 Difference]: Without dead ends: 374 [2021-05-06 12:10:14,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 1491.6ms TimeCoverageRelationStatistics Valid=200, Invalid=1870, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:10:14,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-05-06 12:10:15,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 322. [2021-05-06 12:10:15,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:15,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:15,063 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:15,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:15,063 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:15,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:15,063 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:15,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:15,064 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:15,064 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:15,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable818 [2021-05-06 12:10:15,064 INFO L428 AbstractCegarLoop]: === Iteration 179 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:15,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:15,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1820927937, now seen corresponding path program 164 times [2021-05-06 12:10:15,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:15,064 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479071154] [2021-05-06 12:10:15,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:15,072 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:15,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:15,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:15,109 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:15,121 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,124 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:15,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:15,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:15,156 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:15,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,167 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:15,169 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:15,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:15,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:15,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:15,218 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,220 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:15,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:15,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:15,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:15,251 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:15,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:15,261 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:15,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:15,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:15,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:15,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:15,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:15,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:15,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:16,973 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:16,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479071154] [2021-05-06 12:10:16,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [479071154] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:16,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:16,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:10:16,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888163939] [2021-05-06 12:10:16,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:10:16,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:16,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:10:16,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1783, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:10:16,974 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:18,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:18,877 INFO L93 Difference]: Finished difference Result 548 states and 652 transitions. [2021-05-06 12:10:18,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:10:18,877 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:18,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:18,878 INFO L225 Difference]: With dead ends: 548 [2021-05-06 12:10:18,878 INFO L226 Difference]: Without dead ends: 371 [2021-05-06 12:10:18,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1030 ImplicationChecksByTransitivity, 1675.7ms TimeCoverageRelationStatistics Valid=207, Invalid=1955, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:10:18,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-05-06 12:10:19,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 322. [2021-05-06 12:10:19,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:19,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:19,321 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:19,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:19,321 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:19,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:19,321 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:19,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:19,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:19,322 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:19,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable823 [2021-05-06 12:10:19,322 INFO L428 AbstractCegarLoop]: === Iteration 180 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:19,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:19,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1546168323, now seen corresponding path program 165 times [2021-05-06 12:10:19,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:19,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738944156] [2021-05-06 12:10:19,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:19,328 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:19,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:19,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:19,358 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:19,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,376 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:19,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:19,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:19,420 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:19,433 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,434 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:19,436 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:19,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:19,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:19,472 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:19,485 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,487 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:19,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:19,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:19,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:19,516 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:19,527 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:19,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:19,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:19,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:19,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:19,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:21,167 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:21,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738944156] [2021-05-06 12:10:21,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1738944156] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:21,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:21,167 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:10:21,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893645193] [2021-05-06 12:10:21,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:10:21,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:21,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:10:21,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:10:21,168 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:22,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:22,984 INFO L93 Difference]: Finished difference Result 545 states and 649 transitions. [2021-05-06 12:10:22,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:10:22,985 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:22,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:22,985 INFO L225 Difference]: With dead ends: 545 [2021-05-06 12:10:22,985 INFO L226 Difference]: Without dead ends: 368 [2021-05-06 12:10:22,986 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 1603.9ms TimeCoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:10:22,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-05-06 12:10:23,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 322. [2021-05-06 12:10:23,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:23,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:23,433 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:23,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:23,433 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:23,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:23,433 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:23,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:23,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:23,434 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:23,434 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable828 [2021-05-06 12:10:23,434 INFO L428 AbstractCegarLoop]: === Iteration 181 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:23,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:23,434 INFO L82 PathProgramCache]: Analyzing trace with hash -159964929, now seen corresponding path program 166 times [2021-05-06 12:10:23,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:23,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048814503] [2021-05-06 12:10:23,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:23,455 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:23,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:23,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:23,482 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:23,496 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:23,498 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:23,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:23,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:23,527 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:23,537 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:23,537 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:23,539 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:23,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,551 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:23,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:23,566 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:23,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:23,579 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:23,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:23,599 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:23,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:23,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:23,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:23,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:23,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:23,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:23,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:25,192 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:25,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048814503] [2021-05-06 12:10:25,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2048814503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:25,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:25,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:10:25,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282388999] [2021-05-06 12:10:25,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:10:25,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:25,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:10:25,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1951, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:10:25,193 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:26,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:26,984 INFO L93 Difference]: Finished difference Result 542 states and 646 transitions. [2021-05-06 12:10:26,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:10:26,984 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:26,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:26,985 INFO L225 Difference]: With dead ends: 542 [2021-05-06 12:10:26,985 INFO L226 Difference]: Without dead ends: 365 [2021-05-06 12:10:26,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 22 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1006 ImplicationChecksByTransitivity, 1542.9ms TimeCoverageRelationStatistics Valid=221, Invalid=2131, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:10:26,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-05-06 12:10:27,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 322. [2021-05-06 12:10:27,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:27,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:27,406 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:27,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:27,406 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:27,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:27,407 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:27,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:27,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:27,407 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:27,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable833 [2021-05-06 12:10:27,407 INFO L428 AbstractCegarLoop]: === Iteration 182 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:27,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:27,407 INFO L82 PathProgramCache]: Analyzing trace with hash -97925315, now seen corresponding path program 167 times [2021-05-06 12:10:27,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:27,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647394818] [2021-05-06 12:10:27,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:27,413 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:27,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:27,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:27,440 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:27,451 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:27,454 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:27,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:27,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:27,481 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:27,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:27,491 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:27,493 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:27,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:27,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:27,522 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:27,534 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:27,536 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:27,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:27,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:27,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:27,565 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:27,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:27,576 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:27,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:27,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:27,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:27,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:27,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:27,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:27,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:29,161 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:29,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647394818] [2021-05-06 12:10:29,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [647394818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:29,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:29,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:10:29,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758484132] [2021-05-06 12:10:29,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:10:29,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:29,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:10:29,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=2038, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:10:29,162 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:31,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:31,125 INFO L93 Difference]: Finished difference Result 539 states and 643 transitions. [2021-05-06 12:10:31,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:10:31,126 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:31,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:31,126 INFO L225 Difference]: With dead ends: 539 [2021-05-06 12:10:31,126 INFO L226 Difference]: Without dead ends: 362 [2021-05-06 12:10:31,127 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 1552.6ms TimeCoverageRelationStatistics Valid=228, Invalid=2222, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:10:31,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-06 12:10:31,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 322. [2021-05-06 12:10:31,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:31,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:31,573 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:31,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:31,573 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:31,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:31,573 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:31,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:31,574 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:31,574 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:31,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable838 [2021-05-06 12:10:31,574 INFO L428 AbstractCegarLoop]: === Iteration 183 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:31,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:31,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1903363649, now seen corresponding path program 168 times [2021-05-06 12:10:31,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:31,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776391106] [2021-05-06 12:10:31,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:31,581 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:31,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:31,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:31,613 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:31,625 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:31,627 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:31,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:31,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:31,658 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:31,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:31,669 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:31,671 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:31,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,673 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,680 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:31,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:31,704 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:31,722 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:31,724 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:31,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:31,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:31,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:31,758 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:31,770 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:31,771 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:31,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:31,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:31,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:31,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:31,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:31,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:31,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:33,454 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:33,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776391106] [2021-05-06 12:10:33,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [776391106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:33,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:33,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:10:33,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321083463] [2021-05-06 12:10:33,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:10:33,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:33,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:10:33,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=2127, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:10:33,455 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 47 states, 47 states have (on average 1.553191489361702) internal successors, (73), 45 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:35,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:35,497 INFO L93 Difference]: Finished difference Result 536 states and 640 transitions. [2021-05-06 12:10:35,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:10:35,498 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.553191489361702) internal successors, (73), 45 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:35,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:35,498 INFO L225 Difference]: With dead ends: 536 [2021-05-06 12:10:35,498 INFO L226 Difference]: Without dead ends: 359 [2021-05-06 12:10:35,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 1647.6ms TimeCoverageRelationStatistics Valid=235, Invalid=2315, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:10:35,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-05-06 12:10:35,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 322. [2021-05-06 12:10:35,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:35,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:35,933 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:35,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:35,933 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:35,933 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.553191489361702) internal successors, (73), 45 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:35,933 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:35,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:35,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:35,933 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:35,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable843 [2021-05-06 12:10:35,933 INFO L428 AbstractCegarLoop]: === Iteration 184 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:35,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:35,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1573955197, now seen corresponding path program 169 times [2021-05-06 12:10:35,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:35,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100179537] [2021-05-06 12:10:35,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:35,940 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:35,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:35,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:35,967 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:35,978 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:35,980 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:35,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:35,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:36,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:36,015 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:36,025 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:36,026 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:36,028 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:36,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:36,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:36,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:36,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:36,056 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:36,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:36,070 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:36,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:36,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:36,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:36,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:36,099 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:36,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:36,117 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:36,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:36,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:36,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:36,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:36,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:36,228 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:36,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:37,902 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:37,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100179537] [2021-05-06 12:10:37,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2100179537] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:37,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:37,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:10:37,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061194857] [2021-05-06 12:10:37,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:10:37,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:37,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:10:37,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=2218, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:10:37,903 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 48 states, 48 states have (on average 1.5208333333333333) internal successors, (73), 46 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:40,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:40,085 INFO L93 Difference]: Finished difference Result 533 states and 637 transitions. [2021-05-06 12:10:40,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:10:40,085 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5208333333333333) internal successors, (73), 46 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:40,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:40,085 INFO L225 Difference]: With dead ends: 533 [2021-05-06 12:10:40,085 INFO L226 Difference]: Without dead ends: 356 [2021-05-06 12:10:40,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 1745.3ms TimeCoverageRelationStatistics Valid=242, Invalid=2410, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:10:40,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-06 12:10:40,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 322. [2021-05-06 12:10:40,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:40,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:40,531 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:40,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:40,531 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:40,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.5208333333333333) internal successors, (73), 46 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:40,532 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:40,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:40,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:40,532 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:40,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable848 [2021-05-06 12:10:40,532 INFO L428 AbstractCegarLoop]: === Iteration 185 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:40,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:40,532 INFO L82 PathProgramCache]: Analyzing trace with hash -14392705, now seen corresponding path program 170 times [2021-05-06 12:10:40,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:40,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169573768] [2021-05-06 12:10:40,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:40,538 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:40,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:40,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:40,566 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:40,578 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,581 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:40,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:40,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:40,617 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:40,628 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,629 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:40,631 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:40,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:40,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:40,666 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:40,678 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,680 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:40,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:40,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:40,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:40,710 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:40,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:40,721 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:40,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:40,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:40,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:40,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:40,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:40,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:40,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:42,480 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:42,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169573768] [2021-05-06 12:10:42,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1169573768] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:42,481 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:42,481 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:10:42,481 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279895534] [2021-05-06 12:10:42,481 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:10:42,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:42,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:10:42,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=2311, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:10:42,481 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 49 states, 49 states have (on average 1.489795918367347) internal successors, (73), 47 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:44,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:44,555 INFO L93 Difference]: Finished difference Result 531 states and 635 transitions. [2021-05-06 12:10:44,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:10:44,555 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.489795918367347) internal successors, (73), 47 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:44,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:44,555 INFO L225 Difference]: With dead ends: 531 [2021-05-06 12:10:44,555 INFO L226 Difference]: Without dead ends: 354 [2021-05-06 12:10:44,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 1723.8ms TimeCoverageRelationStatistics Valid=249, Invalid=2507, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:10:44,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-06 12:10:45,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 322. [2021-05-06 12:10:45,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 307 states have (on average 1.1954397394136809) internal successors, (367), 310 states have internal predecessors, (367), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:45,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 384 transitions. [2021-05-06 12:10:45,002 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 384 transitions. Word has length 79 [2021-05-06 12:10:45,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:45,002 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 384 transitions. [2021-05-06 12:10:45,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.489795918367347) internal successors, (73), 47 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:45,003 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 384 transitions. [2021-05-06 12:10:45,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:10:45,003 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:45,003 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:45,003 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable853 [2021-05-06 12:10:45,003 INFO L428 AbstractCegarLoop]: === Iteration 186 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:45,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:45,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1025509955, now seen corresponding path program 171 times [2021-05-06 12:10:45,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:45,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509580608] [2021-05-06 12:10:45,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:45,008 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:45,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:45,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:45,037 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:45,049 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,051 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:45,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,062 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:45,065 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:45,079 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:45,089 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,090 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:45,091 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:45,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:45,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:45,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:45,119 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:45,128 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:45,129 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:45,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:45,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:45,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:45,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:45,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:45,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:45,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:46,887 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:46,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509580608] [2021-05-06 12:10:46,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [509580608] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:46,887 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:46,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:10:46,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000827315] [2021-05-06 12:10:46,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:10:46,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:46,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:10:46,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=2406, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:10:46,888 INFO L87 Difference]: Start difference. First operand 322 states and 384 transitions. Second operand has 50 states, 50 states have (on average 1.46) internal successors, (73), 48 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:49,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:49,112 INFO L93 Difference]: Finished difference Result 542 states and 650 transitions. [2021-05-06 12:10:49,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:10:49,112 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.46) internal successors, (73), 48 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2021-05-06 12:10:49,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:49,113 INFO L225 Difference]: With dead ends: 542 [2021-05-06 12:10:49,113 INFO L226 Difference]: Without dead ends: 354 [2021-05-06 12:10:49,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 1723.7ms TimeCoverageRelationStatistics Valid=256, Invalid=2606, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:10:49,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-06 12:10:49,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 325. [2021-05-06 12:10:49,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 310 states have (on average 1.196774193548387) internal successors, (371), 313 states have internal predecessors, (371), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:49,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 388 transitions. [2021-05-06 12:10:49,570 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 388 transitions. Word has length 79 [2021-05-06 12:10:49,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:49,570 INFO L480 AbstractCegarLoop]: Abstraction has 325 states and 388 transitions. [2021-05-06 12:10:49,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.46) internal successors, (73), 48 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:49,570 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 388 transitions. [2021-05-06 12:10:49,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 12:10:49,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:49,571 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:49,571 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable857 [2021-05-06 12:10:49,571 INFO L428 AbstractCegarLoop]: === Iteration 187 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:49,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:49,571 INFO L82 PathProgramCache]: Analyzing trace with hash -51445275, now seen corresponding path program 8 times [2021-05-06 12:10:49,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:49,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962438909] [2021-05-06 12:10:49,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:49,582 WARN L240 tifierPushTermWalker]: treesize reduction 85, result has 51.4 percent of original size [2021-05-06 12:10:49,630 WARN L245 tifierPushTermWalker]: treesize reduction 85, result has 51.4 percent of original size 90 [2021-05-06 12:10:49,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:49,682 WARN L240 tifierPushTermWalker]: treesize reduction 74, result has 55.2 percent of original size [2021-05-06 12:10:49,732 WARN L245 tifierPushTermWalker]: treesize reduction 74, result has 55.2 percent of original size 91 [2021-05-06 12:10:49,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:49,760 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:49,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:49,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:49,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:49,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:49,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:49,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:50,086 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:50,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962438909] [2021-05-06 12:10:50,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [962438909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:50,087 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:50,087 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:10:50,087 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078247956] [2021-05-06 12:10:50,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:10:50,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:50,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:10:50,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=362, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:10:50,087 INFO L87 Difference]: Start difference. First operand 325 states and 388 transitions. Second operand has 23 states, 23 states have (on average 3.0) internal successors, (69), 22 states have internal predecessors, (69), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:10:51,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:51,180 INFO L93 Difference]: Finished difference Result 632 states and 750 transitions. [2021-05-06 12:10:51,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:10:51,180 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0) internal successors, (69), 22 states have internal predecessors, (69), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 81 [2021-05-06 12:10:51,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:51,181 INFO L225 Difference]: With dead ends: 632 [2021-05-06 12:10:51,181 INFO L226 Difference]: Without dead ends: 446 [2021-05-06 12:10:51,181 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 24 SyntacticMatches, 16 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 411.5ms TimeCoverageRelationStatistics Valid=296, Invalid=696, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:10:51,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-05-06 12:10:51,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 343. [2021-05-06 12:10:51,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.1951219512195121) internal successors, (392), 331 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:51,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 409 transitions. [2021-05-06 12:10:51,609 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 409 transitions. Word has length 81 [2021-05-06 12:10:51,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:51,610 INFO L480 AbstractCegarLoop]: Abstraction has 343 states and 409 transitions. [2021-05-06 12:10:51,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0) internal successors, (69), 22 states have internal predecessors, (69), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:10:51,610 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 409 transitions. [2021-05-06 12:10:51,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:51,610 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:51,610 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:51,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable858 [2021-05-06 12:10:51,610 INFO L428 AbstractCegarLoop]: === Iteration 188 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:51,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:51,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1888113636, now seen corresponding path program 172 times [2021-05-06 12:10:51,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:51,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74025521] [2021-05-06 12:10:51,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:51,616 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:51,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:51,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:51,642 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:51,654 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:51,656 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:51,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:51,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:51,684 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:51,694 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:51,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:51,696 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:51,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:51,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:51,722 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:51,734 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:51,736 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:51,745 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:51,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:51,758 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:51,765 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:51,780 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:51,781 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:51,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:51,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:51,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:51,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:51,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:51,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:51,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:53,285 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:53,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74025521] [2021-05-06 12:10:53,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [74025521] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:53,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:53,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:10:53,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554402193] [2021-05-06 12:10:53,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:10:53,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:53,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:10:53,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1129, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:10:53,287 INFO L87 Difference]: Start difference. First operand 343 states and 409 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:55,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:55,347 INFO L93 Difference]: Finished difference Result 623 states and 736 transitions. [2021-05-06 12:10:55,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:10:55,347 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:10:55,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:55,348 INFO L225 Difference]: With dead ends: 623 [2021-05-06 12:10:55,348 INFO L226 Difference]: Without dead ends: 428 [2021-05-06 12:10:55,348 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 7 SyntacticMatches, 37 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 1499.8ms TimeCoverageRelationStatistics Valid=146, Invalid=1336, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:10:55,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-05-06 12:10:56,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 400. [2021-05-06 12:10:56,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 385 states have (on average 1.1688311688311688) internal successors, (450), 388 states have internal predecessors, (450), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:10:56,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 467 transitions. [2021-05-06 12:10:56,241 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 467 transitions. Word has length 82 [2021-05-06 12:10:56,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:56,241 INFO L480 AbstractCegarLoop]: Abstraction has 400 states and 467 transitions. [2021-05-06 12:10:56,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:10:56,242 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 467 transitions. [2021-05-06 12:10:56,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:10:56,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:56,242 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:56,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable863 [2021-05-06 12:10:56,242 INFO L428 AbstractCegarLoop]: === Iteration 189 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:56,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:56,242 INFO L82 PathProgramCache]: Analyzing trace with hash 720673822, now seen corresponding path program 173 times [2021-05-06 12:10:56,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:56,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495128834] [2021-05-06 12:10:56,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:56,248 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:10:56,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:56,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:56,284 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:10:56,296 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,299 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:10:56,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:56,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:56,327 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:10:56,340 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,341 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:56,345 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:10:56,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:56,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:56,376 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:10:56,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,390 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:10:56,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:56,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:10:56,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:10:56,418 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:10:56,428 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:56,429 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:56,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:56,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:56,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:56,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:10:56,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:56,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:56,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:57,922 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:57,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495128834] [2021-05-06 12:10:57,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1495128834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:57,922 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:57,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:10:57,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439008633] [2021-05-06 12:10:57,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:10:57,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:57,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:10:57,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1194, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:10:57,923 INFO L87 Difference]: Start difference. First operand 400 states and 467 transitions. Second operand has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:00,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:00,275 INFO L93 Difference]: Finished difference Result 674 states and 786 transitions. [2021-05-06 12:11:00,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:11:00,275 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:00,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:00,275 INFO L225 Difference]: With dead ends: 674 [2021-05-06 12:11:00,275 INFO L226 Difference]: Without dead ends: 479 [2021-05-06 12:11:00,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 37 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 1456.1ms TimeCoverageRelationStatistics Valid=148, Invalid=1334, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:11:00,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-05-06 12:11:01,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 403. [2021-05-06 12:11:01,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:01,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:01,152 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:01,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:01,153 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:01,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:01,153 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:01,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:01,153 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:01,153 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 17, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:01,153 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable868 [2021-05-06 12:11:01,153 INFO L428 AbstractCegarLoop]: === Iteration 190 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:01,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:01,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1399946076, now seen corresponding path program 174 times [2021-05-06 12:11:01,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:01,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460099872] [2021-05-06 12:11:01,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:01,159 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:01,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,171 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:01,180 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:01,188 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:01,199 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,202 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:01,210 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:01,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:01,230 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:01,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:01,243 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:01,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:01,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:01,272 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:01,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:01,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:01,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:01,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:01,318 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:01,328 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:01,329 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:01,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:01,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:01,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:01,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:01,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:01,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:01,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:02,834 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:02,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460099872] [2021-05-06 12:11:02,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1460099872] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:02,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:02,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:11:02,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339565038] [2021-05-06 12:11:02,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:11:02,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:02,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:11:02,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:11:02,835 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:05,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:05,404 INFO L93 Difference]: Finished difference Result 677 states and 789 transitions. [2021-05-06 12:11:05,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:11:05,406 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:05,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:05,406 INFO L225 Difference]: With dead ends: 677 [2021-05-06 12:11:05,406 INFO L226 Difference]: Without dead ends: 482 [2021-05-06 12:11:05,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 36 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 1472.8ms TimeCoverageRelationStatistics Valid=155, Invalid=1405, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:11:05,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2021-05-06 12:11:06,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 403. [2021-05-06 12:11:06,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:06,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:06,362 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:06,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:06,362 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:06,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:06,362 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:06,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:06,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:06,363 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:06,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable873 [2021-05-06 12:11:06,363 INFO L428 AbstractCegarLoop]: === Iteration 191 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:06,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:06,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1960645854, now seen corresponding path program 175 times [2021-05-06 12:11:06,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:06,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509043541] [2021-05-06 12:11:06,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:06,369 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:06,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:06,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:06,397 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:06,409 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,412 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:06,412 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,413 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:06,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:06,439 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:06,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,450 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:06,452 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:06,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:06,462 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:06,478 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:06,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,492 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:06,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:06,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:06,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:06,529 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:06,539 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:06,540 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:06,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:06,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:06,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:06,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:06,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:06,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:06,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:08,039 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:08,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509043541] [2021-05-06 12:11:08,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [509043541] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:08,040 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:08,040 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:11:08,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207834208] [2021-05-06 12:11:08,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:11:08,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:08,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:11:08,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1330, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:11:08,041 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:10,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:10,567 INFO L93 Difference]: Finished difference Result 674 states and 786 transitions. [2021-05-06 12:11:10,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:11:10,567 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:10,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:10,567 INFO L225 Difference]: With dead ends: 674 [2021-05-06 12:11:10,567 INFO L226 Difference]: Without dead ends: 479 [2021-05-06 12:11:10,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 35 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 1464.8ms TimeCoverageRelationStatistics Valid=162, Invalid=1478, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:11:10,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-05-06 12:11:11,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 403. [2021-05-06 12:11:11,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:11,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:11,457 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:11,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:11,458 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:11,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:11,458 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:11,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:11,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:11,458 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:11,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable878 [2021-05-06 12:11:11,458 INFO L428 AbstractCegarLoop]: === Iteration 192 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:11,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:11,458 INFO L82 PathProgramCache]: Analyzing trace with hash 2001320604, now seen corresponding path program 176 times [2021-05-06 12:11:11,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:11,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253615893] [2021-05-06 12:11:11,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:11,465 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:11,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:11,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:11,495 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:11,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,511 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:11,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:11,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:11,539 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:11,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,549 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:11,551 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:11,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:11,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:11,581 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:11,593 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,595 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:11,596 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:11,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:11,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:11,624 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:11,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:11,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:11,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:11,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:11,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:11,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:11,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:11,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:11,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:13,104 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:13,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253615893] [2021-05-06 12:11:13,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [253615893] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:13,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:13,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:11:13,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565245332] [2021-05-06 12:11:13,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:11:13,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:13,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:11:13,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1401, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:11:13,105 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:15,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:15,735 INFO L93 Difference]: Finished difference Result 671 states and 783 transitions. [2021-05-06 12:11:15,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:11:15,736 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:15,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:15,737 INFO L225 Difference]: With dead ends: 671 [2021-05-06 12:11:15,737 INFO L226 Difference]: Without dead ends: 476 [2021-05-06 12:11:15,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 8 SyntacticMatches, 32 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 1433.0ms TimeCoverageRelationStatistics Valid=169, Invalid=1553, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:11:15,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2021-05-06 12:11:16,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 403. [2021-05-06 12:11:16,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:16,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:16,617 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:16,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:16,617 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:16,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:16,617 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:16,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:16,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:16,617 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:16,617 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable883 [2021-05-06 12:11:16,617 INFO L428 AbstractCegarLoop]: === Iteration 193 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:16,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:16,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1849746018, now seen corresponding path program 177 times [2021-05-06 12:11:16,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:16,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111522670] [2021-05-06 12:11:16,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:16,623 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:16,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:16,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:16,652 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:16,664 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:16,666 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:16,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:16,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:16,693 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:16,703 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:16,703 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:16,705 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:16,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,718 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:16,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:16,734 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:16,745 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:16,747 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:16,748 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,748 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:16,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:16,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:16,774 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:16,784 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:16,785 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:16,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:16,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:16,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:16,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:16,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:16,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:16,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:18,306 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:18,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111522670] [2021-05-06 12:11:18,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2111522670] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:18,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:18,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:11:18,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22197485] [2021-05-06 12:11:18,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:11:18,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:18,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:11:18,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1474, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:11:18,307 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:20,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:20,744 INFO L93 Difference]: Finished difference Result 668 states and 780 transitions. [2021-05-06 12:11:20,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:11:20,744 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:20,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:20,745 INFO L225 Difference]: With dead ends: 668 [2021-05-06 12:11:20,745 INFO L226 Difference]: Without dead ends: 473 [2021-05-06 12:11:20,745 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 1488.6ms TimeCoverageRelationStatistics Valid=176, Invalid=1630, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:11:20,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-05-06 12:11:21,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 403. [2021-05-06 12:11:21,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:21,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:21,645 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:21,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:21,645 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:21,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:21,645 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:21,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:21,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:21,646 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:21,646 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable888 [2021-05-06 12:11:21,646 INFO L428 AbstractCegarLoop]: === Iteration 194 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:21,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:21,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1964141020, now seen corresponding path program 178 times [2021-05-06 12:11:21,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:21,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839012801] [2021-05-06 12:11:21,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:21,651 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:21,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:21,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:21,685 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:21,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:21,699 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:21,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:21,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:21,730 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:21,740 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:21,741 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:21,743 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:21,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:21,754 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:21,771 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:21,782 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:21,784 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:21,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:21,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:21,814 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:21,824 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:21,824 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:21,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:21,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:21,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:21,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:21,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:21,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:21,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:23,379 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:23,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839012801] [2021-05-06 12:11:23,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1839012801] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:23,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:23,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:11:23,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524587392] [2021-05-06 12:11:23,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:11:23,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:23,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:11:23,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1549, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:11:23,380 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 40 states, 40 states have (on average 1.9) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:25,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:25,766 INFO L93 Difference]: Finished difference Result 665 states and 777 transitions. [2021-05-06 12:11:25,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:11:25,767 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:25,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:25,767 INFO L225 Difference]: With dead ends: 665 [2021-05-06 12:11:25,767 INFO L226 Difference]: Without dead ends: 470 [2021-05-06 12:11:25,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 1521.3ms TimeCoverageRelationStatistics Valid=183, Invalid=1709, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:11:25,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-05-06 12:11:26,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 403. [2021-05-06 12:11:26,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:26,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:26,740 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:26,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:26,741 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:26,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:26,741 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:26,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:26,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:26,741 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:26,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable893 [2021-05-06 12:11:26,741 INFO L428 AbstractCegarLoop]: === Iteration 195 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:26,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:26,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1611052638, now seen corresponding path program 179 times [2021-05-06 12:11:26,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:26,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071500157] [2021-05-06 12:11:26,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:26,747 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:26,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:26,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:26,786 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:26,800 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,802 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:26,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:26,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:26,834 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:26,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,846 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:26,848 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:26,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:26,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:26,878 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:26,891 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,893 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:26,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:26,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:26,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:26,933 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:26,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:26,945 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:26,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:27,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:27,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:27,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:27,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:27,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:27,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:28,556 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:28,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071500157] [2021-05-06 12:11:28,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2071500157] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:28,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:28,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:11:28,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122666821] [2021-05-06 12:11:28,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:11:28,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:28,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:11:28,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:11:28,557 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:31,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:31,178 INFO L93 Difference]: Finished difference Result 662 states and 774 transitions. [2021-05-06 12:11:31,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:11:31,179 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:31,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:31,179 INFO L225 Difference]: With dead ends: 662 [2021-05-06 12:11:31,179 INFO L226 Difference]: Without dead ends: 467 [2021-05-06 12:11:31,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1017 ImplicationChecksByTransitivity, 1574.3ms TimeCoverageRelationStatistics Valid=190, Invalid=1790, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:11:31,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2021-05-06 12:11:32,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 403. [2021-05-06 12:11:32,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:32,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:32,054 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:32,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:32,054 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:32,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:32,054 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:32,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:32,054 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:32,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable898 [2021-05-06 12:11:32,055 INFO L428 AbstractCegarLoop]: === Iteration 196 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:32,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:32,055 INFO L82 PathProgramCache]: Analyzing trace with hash -438335204, now seen corresponding path program 180 times [2021-05-06 12:11:32,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:32,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836113728] [2021-05-06 12:11:32,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:32,065 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:32,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:32,077 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:32,094 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:32,105 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:32,108 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:32,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:32,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:32,136 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:32,145 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:32,146 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:32,148 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:32,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:32,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:32,175 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:32,187 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:32,189 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:32,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:32,199 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:32,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:32,216 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:32,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:32,227 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:32,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:32,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:32,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:32,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:32,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:32,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:32,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:33,788 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:33,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836113728] [2021-05-06 12:11:33,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1836113728] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:33,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:33,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:11:33,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807777594] [2021-05-06 12:11:33,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:11:33,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:33,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:11:33,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1705, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:11:33,789 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:36,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:36,471 INFO L93 Difference]: Finished difference Result 659 states and 771 transitions. [2021-05-06 12:11:36,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:11:36,471 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:36,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:36,472 INFO L225 Difference]: With dead ends: 659 [2021-05-06 12:11:36,472 INFO L226 Difference]: Without dead ends: 464 [2021-05-06 12:11:36,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 1528.2ms TimeCoverageRelationStatistics Valid=197, Invalid=1873, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:11:36,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-05-06 12:11:37,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 403. [2021-05-06 12:11:37,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:37,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:37,444 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:37,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:37,444 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:37,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:37,444 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:37,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:37,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:37,445 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:37,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable903 [2021-05-06 12:11:37,445 INFO L428 AbstractCegarLoop]: === Iteration 197 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:37,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:37,445 INFO L82 PathProgramCache]: Analyzing trace with hash -14688482, now seen corresponding path program 181 times [2021-05-06 12:11:37,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:37,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620222148] [2021-05-06 12:11:37,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:37,453 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:37,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,473 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:37,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:37,482 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:37,494 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:37,496 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:37,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:37,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:37,524 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:37,534 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:37,534 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:37,536 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:37,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:37,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:37,565 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:37,577 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:37,580 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:37,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:37,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:37,614 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:37,625 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:37,626 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:37,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:37,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:37,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:37,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:39,329 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:39,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620222148] [2021-05-06 12:11:39,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [620222148] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:39,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:39,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:11:39,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328420605] [2021-05-06 12:11:39,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:11:39,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:39,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:11:39,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1786, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:11:39,330 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:41,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:41,800 INFO L93 Difference]: Finished difference Result 656 states and 768 transitions. [2021-05-06 12:11:41,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:11:41,800 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:41,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:41,801 INFO L225 Difference]: With dead ends: 656 [2021-05-06 12:11:41,801 INFO L226 Difference]: Without dead ends: 461 [2021-05-06 12:11:41,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1090 ImplicationChecksByTransitivity, 1628.5ms TimeCoverageRelationStatistics Valid=204, Invalid=1958, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:11:41,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-05-06 12:11:42,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 403. [2021-05-06 12:11:42,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:42,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:42,691 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:42,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:42,691 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:42,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:42,691 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:42,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:42,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:42,691 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:42,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable908 [2021-05-06 12:11:42,691 INFO L428 AbstractCegarLoop]: === Iteration 198 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:42,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:42,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1044047780, now seen corresponding path program 182 times [2021-05-06 12:11:42,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:42,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520056659] [2021-05-06 12:11:42,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:42,697 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:42,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:42,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:42,727 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:42,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:42,741 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:42,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:42,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:42,769 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:42,779 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:42,780 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:42,782 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:42,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:42,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:42,810 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:42,822 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:42,824 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:42,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:42,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:42,852 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:42,862 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:42,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:42,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:42,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:42,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:42,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:42,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:42,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:42,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:44,425 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:44,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520056659] [2021-05-06 12:11:44,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1520056659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:44,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:44,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:11:44,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718426110] [2021-05-06 12:11:44,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:11:44,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:44,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:11:44,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1869, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:11:44,426 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:46,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:46,868 INFO L93 Difference]: Finished difference Result 653 states and 765 transitions. [2021-05-06 12:11:46,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:11:46,868 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:46,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:46,869 INFO L225 Difference]: With dead ends: 653 [2021-05-06 12:11:46,869 INFO L226 Difference]: Without dead ends: 458 [2021-05-06 12:11:46,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 1531.3ms TimeCoverageRelationStatistics Valid=211, Invalid=2045, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:11:46,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-05-06 12:11:47,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 403. [2021-05-06 12:11:47,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:47,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:47,825 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:47,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:47,825 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:47,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:47,825 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:47,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:47,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:47,826 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:47,826 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable913 [2021-05-06 12:11:47,826 INFO L428 AbstractCegarLoop]: === Iteration 199 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:47,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:47,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1888053282, now seen corresponding path program 183 times [2021-05-06 12:11:47,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:47,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705222772] [2021-05-06 12:11:47,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:47,832 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:47,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,840 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:47,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:47,859 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:47,871 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:47,873 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:47,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:47,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:47,903 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:47,912 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:47,913 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:47,915 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:47,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:47,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:47,941 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:47,953 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:47,955 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:47,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:47,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:47,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:47,984 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:47,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:47,994 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:47,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:48,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:48,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:48,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:48,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:48,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:48,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:49,692 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:49,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705222772] [2021-05-06 12:11:49,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1705222772] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:49,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:49,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:11:49,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108162169] [2021-05-06 12:11:49,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:11:49,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:49,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:11:49,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1954, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:11:49,694 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:52,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:52,266 INFO L93 Difference]: Finished difference Result 650 states and 762 transitions. [2021-05-06 12:11:52,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:11:52,266 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:52,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:52,267 INFO L225 Difference]: With dead ends: 650 [2021-05-06 12:11:52,267 INFO L226 Difference]: Without dead ends: 455 [2021-05-06 12:11:52,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 1659.8ms TimeCoverageRelationStatistics Valid=218, Invalid=2134, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:11:52,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-05-06 12:11:53,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 403. [2021-05-06 12:11:53,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:53,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:53,170 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:53,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:53,171 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:53,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:53,171 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:53,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:53,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:53,171 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:53,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable918 [2021-05-06 12:11:53,171 INFO L428 AbstractCegarLoop]: === Iteration 200 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:53,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:53,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1613293668, now seen corresponding path program 184 times [2021-05-06 12:11:53,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:53,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182062533] [2021-05-06 12:11:53,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:53,177 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:53,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:53,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:53,203 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:53,215 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:53,217 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:53,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:53,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:53,244 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:53,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:53,255 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:53,257 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:53,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:53,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:53,285 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:53,296 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:53,298 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:53,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:53,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:53,326 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:53,336 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:53,337 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:53,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:53,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:53,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:53,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:53,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:53,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:54,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:54,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182062533] [2021-05-06 12:11:54,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1182062533] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:54,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:54,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:11:54,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786995327] [2021-05-06 12:11:54,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:11:54,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:54,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:11:54,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=2041, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:11:54,959 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:57,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:57,484 INFO L93 Difference]: Finished difference Result 647 states and 759 transitions. [2021-05-06 12:11:57,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:11:57,484 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:11:57,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:57,485 INFO L225 Difference]: With dead ends: 647 [2021-05-06 12:11:57,485 INFO L226 Difference]: Without dead ends: 452 [2021-05-06 12:11:57,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 1591.5ms TimeCoverageRelationStatistics Valid=225, Invalid=2225, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:11:57,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-05-06 12:11:58,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 403. [2021-05-06 12:11:58,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:11:58,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:11:58,477 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:11:58,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:58,477 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:11:58,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:58,477 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:11:58,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:58,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:58,478 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:58,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable923 [2021-05-06 12:11:58,478 INFO L428 AbstractCegarLoop]: === Iteration 201 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:58,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:58,478 INFO L82 PathProgramCache]: Analyzing trace with hash -227090274, now seen corresponding path program 185 times [2021-05-06 12:11:58,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:58,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397482369] [2021-05-06 12:11:58,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:58,484 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:11:58,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:58,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:58,512 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:11:58,523 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:58,526 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:11:58,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:11:58,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:58,555 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:11:58,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:58,565 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:58,568 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:11:58,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:58,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:58,596 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:11:58,608 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:58,610 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:11:58,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:58,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:11:58,650 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:11:58,659 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:58,660 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:58,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:58,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:58,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:58,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:11:58,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:58,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:11:58,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:00,322 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:00,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397482369] [2021-05-06 12:12:00,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [397482369] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:00,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:00,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:12:00,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821390062] [2021-05-06 12:12:00,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:12:00,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:00,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:12:00,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=2130, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:12:00,323 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:02,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:02,529 INFO L93 Difference]: Finished difference Result 644 states and 756 transitions. [2021-05-06 12:12:02,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:12:02,529 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:02,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:02,530 INFO L225 Difference]: With dead ends: 644 [2021-05-06 12:12:02,530 INFO L226 Difference]: Without dead ends: 449 [2021-05-06 12:12:02,530 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 1625.8ms TimeCoverageRelationStatistics Valid=232, Invalid=2318, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:12:02,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-05-06 12:12:03,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 403. [2021-05-06 12:12:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:03,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:12:03,419 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:12:03,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:03,419 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:12:03,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:03,419 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:12:03,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:03,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:03,420 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:03,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable928 [2021-05-06 12:12:03,420 INFO L428 AbstractCegarLoop]: === Iteration 202 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:03,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:03,420 INFO L82 PathProgramCache]: Analyzing trace with hash -165050660, now seen corresponding path program 186 times [2021-05-06 12:12:03,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:03,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711022649] [2021-05-06 12:12:03,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:03,425 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:03,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:03,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:03,452 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:03,466 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:03,471 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:03,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:03,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:03,506 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:03,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:03,516 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:03,518 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:03,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:03,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:03,550 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:03,561 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:03,563 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:03,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:03,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:03,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:03,592 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:03,602 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:03,603 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:03,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:03,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:03,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:03,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:03,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:03,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:03,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:05,226 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:05,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711022649] [2021-05-06 12:12:05,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [711022649] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:05,227 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:05,227 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:12:05,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995083720] [2021-05-06 12:12:05,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:12:05,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:05,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:12:05,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=2221, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:12:05,228 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 48 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:07,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:07,389 INFO L93 Difference]: Finished difference Result 641 states and 753 transitions. [2021-05-06 12:12:07,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:12:07,389 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:07,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:07,389 INFO L225 Difference]: With dead ends: 641 [2021-05-06 12:12:07,390 INFO L226 Difference]: Without dead ends: 446 [2021-05-06 12:12:07,390 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 7 SyntacticMatches, 23 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 1593.9ms TimeCoverageRelationStatistics Valid=239, Invalid=2413, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:12:07,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-05-06 12:12:08,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 403. [2021-05-06 12:12:08,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:08,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:12:08,276 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:12:08,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:08,276 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:12:08,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:08,276 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:12:08,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:08,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:08,277 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:08,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable933 [2021-05-06 12:12:08,277 INFO L428 AbstractCegarLoop]: === Iteration 203 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:08,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:08,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1970488994, now seen corresponding path program 187 times [2021-05-06 12:12:08,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:08,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849154396] [2021-05-06 12:12:08,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:08,283 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:08,294 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:08,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:08,312 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:08,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:08,326 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:08,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:08,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:08,353 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:08,363 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:08,363 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:08,365 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:08,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:08,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:08,393 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:08,405 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:08,407 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:08,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:08,417 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:08,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:08,434 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:08,444 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:08,445 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:08,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:08,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:08,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:08,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:08,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:08,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:08,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:10,177 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:10,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849154396] [2021-05-06 12:12:10,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [849154396] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:10,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:10,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:12:10,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340938607] [2021-05-06 12:12:10,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:12:10,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:10,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:12:10,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=2314, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:12:10,178 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 49 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 47 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:12,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:12,617 INFO L93 Difference]: Finished difference Result 638 states and 750 transitions. [2021-05-06 12:12:12,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:12:12,626 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 47 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:12,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:12,626 INFO L225 Difference]: With dead ends: 638 [2021-05-06 12:12:12,626 INFO L226 Difference]: Without dead ends: 443 [2021-05-06 12:12:12,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 1701.2ms TimeCoverageRelationStatistics Valid=246, Invalid=2510, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:12:12,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-05-06 12:12:13,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 403. [2021-05-06 12:12:13,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:13,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:12:13,541 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:12:13,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:13,541 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:12:13,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 47 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:13,542 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:12:13,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:13,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:13,542 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 17, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:13,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable938 [2021-05-06 12:12:13,542 INFO L428 AbstractCegarLoop]: === Iteration 204 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:13,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:13,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1506829852, now seen corresponding path program 188 times [2021-05-06 12:12:13,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:13,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120217540] [2021-05-06 12:12:13,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:13,548 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:13,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,566 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:13,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:13,576 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:13,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:13,589 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:13,590 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:13,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:13,617 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:13,626 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:13,627 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:13,629 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:13,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:13,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:13,657 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:13,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:13,671 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:13,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:13,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:13,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:13,705 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:13,715 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:13,715 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:13,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:13,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:13,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:13,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:13,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:13,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:13,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:15,427 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:15,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120217540] [2021-05-06 12:12:15,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [120217540] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:15,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:15,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:12:15,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274985479] [2021-05-06 12:12:15,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:12:15,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:15,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:12:15,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=2409, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:12:15,428 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 50 states, 50 states have (on average 1.52) internal successors, (76), 48 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:17,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:17,622 INFO L93 Difference]: Finished difference Result 635 states and 747 transitions. [2021-05-06 12:12:17,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:12:17,622 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.52) internal successors, (76), 48 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:17,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:17,623 INFO L225 Difference]: With dead ends: 635 [2021-05-06 12:12:17,623 INFO L226 Difference]: Without dead ends: 440 [2021-05-06 12:12:17,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 7 SyntacticMatches, 21 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1023 ImplicationChecksByTransitivity, 1681.0ms TimeCoverageRelationStatistics Valid=253, Invalid=2609, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:12:17,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2021-05-06 12:12:18,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 403. [2021-05-06 12:12:18,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:18,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:12:18,555 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:12:18,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:18,556 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:12:18,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.52) internal successors, (76), 48 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:18,556 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:12:18,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:18,556 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:18,559 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:18,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable943 [2021-05-06 12:12:18,559 INFO L428 AbstractCegarLoop]: === Iteration 205 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:18,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:18,559 INFO L82 PathProgramCache]: Analyzing trace with hash -81518050, now seen corresponding path program 189 times [2021-05-06 12:12:18,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:18,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735737557] [2021-05-06 12:12:18,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:18,565 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:18,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:18,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:18,592 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:18,604 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:18,606 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:18,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:18,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:18,634 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:18,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:18,644 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:18,646 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:18,647 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,648 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:18,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:18,673 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:18,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:18,687 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:18,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:18,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:18,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:18,714 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:18,724 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:18,725 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:18,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:18,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:18,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:18,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:18,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:18,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:18,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:20,506 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:20,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735737557] [2021-05-06 12:12:20,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [735737557] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:20,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:20,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 12:12:20,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001197025] [2021-05-06 12:12:20,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 12:12:20,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:20,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 12:12:20,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=2506, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:12:20,507 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 51 states, 51 states have (on average 1.4901960784313726) internal successors, (76), 49 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:22,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:22,822 INFO L93 Difference]: Finished difference Result 633 states and 745 transitions. [2021-05-06 12:12:22,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:12:22,823 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.4901960784313726) internal successors, (76), 49 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:22,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:22,823 INFO L225 Difference]: With dead ends: 633 [2021-05-06 12:12:22,823 INFO L226 Difference]: Without dead ends: 438 [2021-05-06 12:12:22,824 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1022 ImplicationChecksByTransitivity, 1745.5ms TimeCoverageRelationStatistics Valid=260, Invalid=2710, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:12:22,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-05-06 12:12:23,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 403. [2021-05-06 12:12:23,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 388 states have (on average 1.1675257731958764) internal successors, (453), 391 states have internal predecessors, (453), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:23,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 470 transitions. [2021-05-06 12:12:23,741 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 470 transitions. Word has length 82 [2021-05-06 12:12:23,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:23,741 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 470 transitions. [2021-05-06 12:12:23,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.4901960784313726) internal successors, (76), 49 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:23,741 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 470 transitions. [2021-05-06 12:12:23,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:12:23,742 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:23,742 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:23,742 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable948 [2021-05-06 12:12:23,742 INFO L428 AbstractCegarLoop]: === Iteration 206 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:23,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:23,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1092635300, now seen corresponding path program 190 times [2021-05-06 12:12:23,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:23,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113381114] [2021-05-06 12:12:23,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:23,747 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:23,748 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:23,758 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:23,775 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:23,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,789 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:23,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:23,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:23,817 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:23,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,827 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:23,829 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:23,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:23,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:23,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:23,856 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:23,865 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:23,866 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:23,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:23,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:23,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:23,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:25,670 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:25,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113381114] [2021-05-06 12:12:25,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2113381114] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:25,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:25,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 12:12:25,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878451059] [2021-05-06 12:12:25,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 12:12:25,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:25,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 12:12:25,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2605, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:12:25,671 INFO L87 Difference]: Start difference. First operand 403 states and 470 transitions. Second operand has 52 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 50 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:27,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:27,885 INFO L93 Difference]: Finished difference Result 644 states and 760 transitions. [2021-05-06 12:12:27,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 12:12:27,885 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 50 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2021-05-06 12:12:27,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:27,886 INFO L225 Difference]: With dead ends: 644 [2021-05-06 12:12:27,886 INFO L226 Difference]: Without dead ends: 438 [2021-05-06 12:12:27,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 973 ImplicationChecksByTransitivity, 1762.2ms TimeCoverageRelationStatistics Valid=267, Invalid=2813, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 12:12:27,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-05-06 12:12:28,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 406. [2021-05-06 12:12:28,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 391 states have (on average 1.1687979539641944) internal successors, (457), 394 states have internal predecessors, (457), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:28,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 474 transitions. [2021-05-06 12:12:28,803 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 474 transitions. Word has length 82 [2021-05-06 12:12:28,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:28,803 INFO L480 AbstractCegarLoop]: Abstraction has 406 states and 474 transitions. [2021-05-06 12:12:28,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 50 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:28,803 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 474 transitions. [2021-05-06 12:12:28,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:28,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:28,804 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:28,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable952 [2021-05-06 12:12:28,804 INFO L428 AbstractCegarLoop]: === Iteration 207 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:28,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:28,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1927793379, now seen corresponding path program 1 times [2021-05-06 12:12:28,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:28,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626503502] [2021-05-06 12:12:28,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:28,810 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:28,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:28,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:28,837 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:28,848 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:28,851 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:28,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:28,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:28,879 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:28,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:28,889 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:28,891 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:28,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:28,901 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:28,917 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:28,929 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:28,931 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:28,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:28,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:28,952 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:28,959 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:28,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:28,969 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:28,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:29,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:29,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:29,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:29,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:29,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:29,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:29,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:30,526 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:30,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626503502] [2021-05-06 12:12:30,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1626503502] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:30,526 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:30,526 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:12:30,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787756511] [2021-05-06 12:12:30,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:12:30,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:30,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:12:30,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1169, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:12:30,527 INFO L87 Difference]: Start difference. First operand 406 states and 474 transitions. Second operand has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:32,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:32,849 INFO L93 Difference]: Finished difference Result 446 states and 516 transitions. [2021-05-06 12:12:32,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:12:32,850 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:32,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:32,850 INFO L225 Difference]: With dead ends: 446 [2021-05-06 12:12:32,850 INFO L226 Difference]: Without dead ends: 444 [2021-05-06 12:12:32,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 39 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 1575.5ms TimeCoverageRelationStatistics Valid=201, Invalid=1605, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:12:32,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-05-06 12:12:33,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 405. [2021-05-06 12:12:33,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 390 states have (on average 1.1692307692307693) internal successors, (456), 393 states have internal predecessors, (456), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:33,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 473 transitions. [2021-05-06 12:12:33,746 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 473 transitions. Word has length 85 [2021-05-06 12:12:33,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:33,747 INFO L480 AbstractCegarLoop]: Abstraction has 405 states and 473 transitions. [2021-05-06 12:12:33,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:33,747 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 473 transitions. [2021-05-06 12:12:33,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:33,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:33,747 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:33,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable957 [2021-05-06 12:12:33,747 INFO L428 AbstractCegarLoop]: === Iteration 208 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:33,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:33,747 INFO L82 PathProgramCache]: Analyzing trace with hash -164506595, now seen corresponding path program 191 times [2021-05-06 12:12:33,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:33,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17618721] [2021-05-06 12:12:33,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:33,756 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:33,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:33,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:33,783 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:33,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:33,797 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:33,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:33,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:33,824 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:33,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:33,835 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:33,837 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:33,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:33,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:33,867 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:33,879 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:33,881 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:33,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:33,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:33,894 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:33,908 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:33,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:33,919 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:33,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:34,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:34,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:34,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:34,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:34,032 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:34,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:35,525 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:35,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17618721] [2021-05-06 12:12:35,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [17618721] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:35,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:35,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:12:35,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480412671] [2021-05-06 12:12:35,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:12:35,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:35,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:12:35,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1335, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:12:35,526 INFO L87 Difference]: Start difference. First operand 405 states and 473 transitions. Second operand has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:38,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:38,167 INFO L93 Difference]: Finished difference Result 685 states and 800 transitions. [2021-05-06 12:12:38,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:12:38,167 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:38,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:38,168 INFO L225 Difference]: With dead ends: 685 [2021-05-06 12:12:38,168 INFO L226 Difference]: Without dead ends: 490 [2021-05-06 12:12:38,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 6 SyntacticMatches, 38 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 1610.2ms TimeCoverageRelationStatistics Valid=162, Invalid=1560, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:12:38,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2021-05-06 12:12:39,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 462. [2021-05-06 12:12:39,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 447 states have (on average 1.1498881431767338) internal successors, (514), 450 states have internal predecessors, (514), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:39,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 531 transitions. [2021-05-06 12:12:39,593 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 531 transitions. Word has length 85 [2021-05-06 12:12:39,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:39,593 INFO L480 AbstractCegarLoop]: Abstraction has 462 states and 531 transitions. [2021-05-06 12:12:39,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:39,593 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 531 transitions. [2021-05-06 12:12:39,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:39,593 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:39,594 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:39,594 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable962 [2021-05-06 12:12:39,594 INFO L428 AbstractCegarLoop]: === Iteration 209 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:39,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:39,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1850686433, now seen corresponding path program 192 times [2021-05-06 12:12:39,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:39,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910021998] [2021-05-06 12:12:39,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:39,599 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:39,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:39,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:39,627 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:39,638 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:39,641 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:39,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:39,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:39,669 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:39,679 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:39,679 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:39,681 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:39,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:39,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:39,724 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:39,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:39,741 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:39,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:39,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:39,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:39,775 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:39,793 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:39,794 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:39,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:39,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:39,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:39,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:39,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:39,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:39,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:41,551 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:41,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910021998] [2021-05-06 12:12:41,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [910021998] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:41,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:41,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:12:41,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178672155] [2021-05-06 12:12:41,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:12:41,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:41,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:12:41,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1406, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:12:41,552 INFO L87 Difference]: Start difference. First operand 462 states and 531 transitions. Second operand has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:44,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:44,419 INFO L93 Difference]: Finished difference Result 736 states and 850 transitions. [2021-05-06 12:12:44,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:12:44,419 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:44,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:44,420 INFO L225 Difference]: With dead ends: 736 [2021-05-06 12:12:44,420 INFO L226 Difference]: Without dead ends: 541 [2021-05-06 12:12:44,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 37 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 1715.2ms TimeCoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:12:44,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-06 12:12:45,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 465. [2021-05-06 12:12:45,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:45,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:12:45,811 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:12:45,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:45,811 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:12:45,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:45,811 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:12:45,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:45,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:45,812 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:45,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable967 [2021-05-06 12:12:45,812 INFO L428 AbstractCegarLoop]: === Iteration 210 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:45,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:45,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1171414179, now seen corresponding path program 193 times [2021-05-06 12:12:45,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:45,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278955491] [2021-05-06 12:12:45,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:45,818 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:45,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,822 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:45,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:45,848 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:45,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:45,862 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:45,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:45,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:45,889 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:45,899 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:45,899 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:45,901 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:45,912 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:45,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:45,930 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:45,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:45,944 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:45,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:45,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:45,972 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:45,982 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:45,982 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:45,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:46,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:46,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:46,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:46,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:46,091 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:46,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:47,567 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:47,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278955491] [2021-05-06 12:12:47,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1278955491] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:47,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:47,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:12:47,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965184215] [2021-05-06 12:12:47,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:12:47,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:47,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:12:47,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1479, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:12:47,568 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:50,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:50,851 INFO L93 Difference]: Finished difference Result 739 states and 853 transitions. [2021-05-06 12:12:50,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:12:50,852 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:50,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:50,852 INFO L225 Difference]: With dead ends: 739 [2021-05-06 12:12:50,852 INFO L226 Difference]: Without dead ends: 544 [2021-05-06 12:12:50,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 1543.8ms TimeCoverageRelationStatistics Valid=171, Invalid=1635, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:12:50,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-05-06 12:12:52,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 465. [2021-05-06 12:12:52,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:52,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:12:52,294 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:12:52,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:52,294 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:12:52,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:52,294 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:12:52,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:52,295 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:52,295 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:52,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable972 [2021-05-06 12:12:52,295 INFO L428 AbstractCegarLoop]: === Iteration 211 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:52,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:52,295 INFO L82 PathProgramCache]: Analyzing trace with hash -610714401, now seen corresponding path program 194 times [2021-05-06 12:12:52,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:52,295 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090507542] [2021-05-06 12:12:52,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:52,301 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:52,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:52,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:52,329 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:52,345 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:52,347 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:52,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:52,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:52,376 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:52,386 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:52,387 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:52,389 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:52,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,401 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:52,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:52,420 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:52,431 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:52,433 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:52,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,435 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:52,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:52,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:52,464 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:52,474 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:52,474 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:52,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:52,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:52,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:52,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:52,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:52,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:52,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:54,082 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:54,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090507542] [2021-05-06 12:12:54,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2090507542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:54,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:54,083 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:12:54,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898950630] [2021-05-06 12:12:54,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:12:54,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:54,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:12:54,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1554, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:12:54,083 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:57,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:57,521 INFO L93 Difference]: Finished difference Result 736 states and 850 transitions. [2021-05-06 12:12:57,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:12:57,521 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:12:57,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:57,522 INFO L225 Difference]: With dead ends: 736 [2021-05-06 12:12:57,522 INFO L226 Difference]: Without dead ends: 541 [2021-05-06 12:12:57,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 35 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 1568.8ms TimeCoverageRelationStatistics Valid=178, Invalid=1714, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:12:57,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-06 12:12:59,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 465. [2021-05-06 12:12:59,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:12:59,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:12:59,135 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:12:59,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:59,135 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:12:59,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:12:59,135 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:12:59,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:12:59,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:59,135 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:59,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable977 [2021-05-06 12:12:59,136 INFO L428 AbstractCegarLoop]: === Iteration 212 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:59,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:59,136 INFO L82 PathProgramCache]: Analyzing trace with hash -570039651, now seen corresponding path program 195 times [2021-05-06 12:12:59,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:59,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291900082] [2021-05-06 12:12:59,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:59,144 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:12:59,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:59,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:59,172 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:12:59,184 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:59,187 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:12:59,187 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,188 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:12:59,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:12:59,215 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:12:59,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:59,226 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:59,228 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:12:59,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:59,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:59,256 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:12:59,268 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:59,271 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:12:59,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:59,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:12:59,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:12:59,299 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:12:59,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:59,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:12:59,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:59,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:59,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:59,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:12:59,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:59,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:59,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:00,940 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:00,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291900082] [2021-05-06 12:13:00,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1291900082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:00,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:00,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:13:00,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439498753] [2021-05-06 12:13:00,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:13:00,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:00,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:13:00,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1631, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:13:00,941 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 39 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:03,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:03,969 INFO L93 Difference]: Finished difference Result 733 states and 847 transitions. [2021-05-06 12:13:03,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:13:03,969 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 39 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:03,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:03,970 INFO L225 Difference]: With dead ends: 733 [2021-05-06 12:13:03,970 INFO L226 Difference]: Without dead ends: 538 [2021-05-06 12:13:03,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 34 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 964 ImplicationChecksByTransitivity, 1585.2ms TimeCoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:13:03,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-05-06 12:13:05,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 465. [2021-05-06 12:13:05,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:05,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:05,484 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:05,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:05,484 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:05,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 39 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:05,484 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:05,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:05,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:05,484 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:05,485 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable982 [2021-05-06 12:13:05,485 INFO L428 AbstractCegarLoop]: === Iteration 213 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:05,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:05,485 INFO L82 PathProgramCache]: Analyzing trace with hash -126138977, now seen corresponding path program 196 times [2021-05-06 12:13:05,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:05,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507568524] [2021-05-06 12:13:05,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:05,491 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:05,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:05,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:05,519 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:05,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:05,533 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:05,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:05,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:05,562 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:05,572 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:05,573 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:05,575 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:05,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:05,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:05,603 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:05,618 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:05,620 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:05,621 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,622 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:05,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:05,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:05,651 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:05,661 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:05,662 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:05,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:05,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:05,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:05,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:05,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:05,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:05,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:07,299 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:07,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507568524] [2021-05-06 12:13:07,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1507568524] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:07,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:07,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:13:07,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899424682] [2021-05-06 12:13:07,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:13:07,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:07,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:13:07,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1710, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:13:07,300 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:10,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:10,578 INFO L93 Difference]: Finished difference Result 730 states and 844 transitions. [2021-05-06 12:13:10,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:13:10,578 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:10,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:10,579 INFO L225 Difference]: With dead ends: 730 [2021-05-06 12:13:10,579 INFO L226 Difference]: Without dead ends: 535 [2021-05-06 12:13:10,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 32 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 1599.2ms TimeCoverageRelationStatistics Valid=192, Invalid=1878, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:13:10,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-06 12:13:12,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 465. [2021-05-06 12:13:12,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:12,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:12,053 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:12,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:12,053 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:12,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:12,053 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:12,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:12,053 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:12,054 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:12,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable987 [2021-05-06 12:13:12,054 INFO L428 AbstractCegarLoop]: === Iteration 214 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:12,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:12,054 INFO L82 PathProgramCache]: Analyzing trace with hash -607219235, now seen corresponding path program 197 times [2021-05-06 12:13:12,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:12,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1336255792] [2021-05-06 12:13:12,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:12,060 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:12,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:12,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:12,086 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:12,098 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:12,100 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:12,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:12,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:12,129 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:12,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:12,139 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:12,141 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:12,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:12,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:12,174 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:12,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:12,188 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:12,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:12,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:12,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:12,217 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:12,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:12,227 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:12,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:12,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:12,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:12,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:12,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:12,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:12,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:13,902 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:13,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1336255792] [2021-05-06 12:13:13,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1336255792] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:13,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:13,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:13:13,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558953428] [2021-05-06 12:13:13,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:13:13,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:13,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:13:13,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1791, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:13:13,903 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:17,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:17,160 INFO L93 Difference]: Finished difference Result 727 states and 841 transitions. [2021-05-06 12:13:17,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:13:17,161 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:17,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:17,161 INFO L225 Difference]: With dead ends: 727 [2021-05-06 12:13:17,161 INFO L226 Difference]: Without dead ends: 532 [2021-05-06 12:13:17,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 8 SyntacticMatches, 30 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1043 ImplicationChecksByTransitivity, 1601.9ms TimeCoverageRelationStatistics Valid=199, Invalid=1963, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:13:17,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-06 12:13:18,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 465. [2021-05-06 12:13:18,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:18,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:18,703 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:18,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:18,703 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:18,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:18,704 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:18,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:18,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:18,704 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:18,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable992 [2021-05-06 12:13:18,704 INFO L428 AbstractCegarLoop]: === Iteration 215 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:18,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:18,704 INFO L82 PathProgramCache]: Analyzing trace with hash -960307617, now seen corresponding path program 198 times [2021-05-06 12:13:18,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:18,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908897112] [2021-05-06 12:13:18,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:18,710 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:18,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:18,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:18,737 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:18,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,751 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:18,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:18,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:18,779 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:18,789 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,789 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:18,791 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:18,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:18,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:18,820 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:18,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,834 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:18,843 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,844 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:18,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:18,856 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:18,863 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:18,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:18,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:18,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:18,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:18,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:18,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:18,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:18,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:18,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:20,552 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:20,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908897112] [2021-05-06 12:13:20,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1908897112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:20,553 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:20,553 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:13:20,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468872525] [2021-05-06 12:13:20,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:13:20,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:20,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:13:20,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1874, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:13:20,553 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:23,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:23,644 INFO L93 Difference]: Finished difference Result 724 states and 838 transitions. [2021-05-06 12:13:23,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:13:23,644 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:23,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:23,645 INFO L225 Difference]: With dead ends: 724 [2021-05-06 12:13:23,645 INFO L226 Difference]: Without dead ends: 529 [2021-05-06 12:13:23,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 1642.6ms TimeCoverageRelationStatistics Valid=206, Invalid=2050, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:13:23,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-05-06 12:13:25,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 465. [2021-05-06 12:13:25,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:25,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:25,237 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:25,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:25,237 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:25,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:25,237 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:25,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:25,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:25,238 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:25,238 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable997 [2021-05-06 12:13:25,238 INFO L428 AbstractCegarLoop]: === Iteration 216 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:25,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:25,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1285271837, now seen corresponding path program 199 times [2021-05-06 12:13:25,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:25,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [908539295] [2021-05-06 12:13:25,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:25,244 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:25,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:25,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:25,272 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:25,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:25,287 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:25,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:25,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:25,316 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:25,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:25,327 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:25,329 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:25,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:25,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:25,358 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:25,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:25,372 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:25,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:25,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:25,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:25,400 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:25,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:25,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:25,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:25,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:25,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:25,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:25,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:25,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:25,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:27,188 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:27,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [908539295] [2021-05-06 12:13:27,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [908539295] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:27,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:27,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:13:27,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358036202] [2021-05-06 12:13:27,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:13:27,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:27,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:13:27,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1959, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:13:27,189 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:30,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:30,143 INFO L93 Difference]: Finished difference Result 721 states and 835 transitions. [2021-05-06 12:13:30,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:13:30,143 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:30,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:30,143 INFO L225 Difference]: With dead ends: 721 [2021-05-06 12:13:30,143 INFO L226 Difference]: Without dead ends: 526 [2021-05-06 12:13:30,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1170 ImplicationChecksByTransitivity, 1739.1ms TimeCoverageRelationStatistics Valid=213, Invalid=2139, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:13:30,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-05-06 12:13:31,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 465. [2021-05-06 12:13:31,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:31,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:31,596 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:31,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:31,596 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:31,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:31,596 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:31,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:31,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:31,597 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:31,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1002 [2021-05-06 12:13:31,597 INFO L428 AbstractCegarLoop]: === Iteration 217 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:31,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:31,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1708918559, now seen corresponding path program 200 times [2021-05-06 12:13:31,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:31,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637142600] [2021-05-06 12:13:31,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:31,602 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:31,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:31,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:31,631 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:31,642 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:31,644 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:31,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:31,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:31,672 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:31,682 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:31,682 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:31,684 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:31,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:31,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:31,713 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:31,724 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:31,726 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:31,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:31,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:31,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:31,754 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:31,764 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:31,765 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:31,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:31,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:31,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:31,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:31,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:31,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:33,492 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:33,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637142600] [2021-05-06 12:13:33,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [637142600] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:33,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:33,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:13:33,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697086437] [2021-05-06 12:13:33,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:13:33,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:33,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:13:33,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=2046, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:13:33,493 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:36,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:36,463 INFO L93 Difference]: Finished difference Result 718 states and 832 transitions. [2021-05-06 12:13:36,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:13:36,464 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:36,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:36,464 INFO L225 Difference]: With dead ends: 718 [2021-05-06 12:13:36,464 INFO L226 Difference]: Without dead ends: 523 [2021-05-06 12:13:36,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 28 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1172 ImplicationChecksByTransitivity, 1678.9ms TimeCoverageRelationStatistics Valid=220, Invalid=2230, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:13:36,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-06 12:13:37,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 465. [2021-05-06 12:13:37,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:37,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:37,995 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:37,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:37,995 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:37,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:37,995 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:37,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:37,995 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:37,996 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:37,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1007 [2021-05-06 12:13:37,996 INFO L428 AbstractCegarLoop]: === Iteration 218 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:37,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:37,996 INFO L82 PathProgramCache]: Analyzing trace with hash 679559261, now seen corresponding path program 201 times [2021-05-06 12:13:37,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:37,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978971590] [2021-05-06 12:13:37,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:38,001 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:38,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:38,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:38,031 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:38,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:38,045 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:38,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:38,059 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:38,073 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:38,083 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:38,084 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:38,086 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:38,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:38,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:38,115 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:38,127 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:38,129 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:38,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:38,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:38,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:38,158 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:38,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:38,169 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:38,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:38,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:38,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:38,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:38,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:38,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:38,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:39,915 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:39,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978971590] [2021-05-06 12:13:39,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1978971590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:39,915 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:39,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:13:39,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128327084] [2021-05-06 12:13:39,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:13:39,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:39,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:13:39,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=2135, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:13:39,916 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 45 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:42,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:42,900 INFO L93 Difference]: Finished difference Result 715 states and 829 transitions. [2021-05-06 12:13:42,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:13:42,900 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 45 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:42,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:42,901 INFO L225 Difference]: With dead ends: 715 [2021-05-06 12:13:42,901 INFO L226 Difference]: Without dead ends: 520 [2021-05-06 12:13:42,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 1716.9ms TimeCoverageRelationStatistics Valid=227, Invalid=2323, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:13:42,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-05-06 12:13:44,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 465. [2021-05-06 12:13:44,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:44,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:44,348 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:44,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:44,348 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:44,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 45 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:44,348 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:44,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:44,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:44,349 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:44,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1012 [2021-05-06 12:13:44,349 INFO L428 AbstractCegarLoop]: === Iteration 219 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:44,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:44,349 INFO L82 PathProgramCache]: Analyzing trace with hash -164446241, now seen corresponding path program 202 times [2021-05-06 12:13:44,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:44,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246521573] [2021-05-06 12:13:44,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:44,359 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:44,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:44,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:44,386 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:44,398 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:44,400 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:44,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:44,421 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:44,428 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:44,438 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:44,438 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:44,440 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:44,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:44,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:44,468 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:44,480 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:44,482 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:44,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:44,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:44,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:44,515 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:44,527 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:44,528 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:44,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:44,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:44,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:44,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:44,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:44,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:44,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:46,298 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:46,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246521573] [2021-05-06 12:13:46,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1246521573] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:46,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:46,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:13:46,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809257372] [2021-05-06 12:13:46,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:13:46,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:46,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:13:46,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:13:46,299 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:49,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:49,586 INFO L93 Difference]: Finished difference Result 712 states and 826 transitions. [2021-05-06 12:13:49,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:13:49,586 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:49,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:49,587 INFO L225 Difference]: With dead ends: 712 [2021-05-06 12:13:49,587 INFO L226 Difference]: Without dead ends: 517 [2021-05-06 12:13:49,587 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 1726.7ms TimeCoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:13:49,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-05-06 12:13:51,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 465. [2021-05-06 12:13:51,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:51,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:51,066 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:51,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:51,066 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:51,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:51,067 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:51,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:51,067 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:51,067 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:51,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1017 [2021-05-06 12:13:51,067 INFO L428 AbstractCegarLoop]: === Iteration 220 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:51,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:51,067 INFO L82 PathProgramCache]: Analyzing trace with hash 110313373, now seen corresponding path program 203 times [2021-05-06 12:13:51,067 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:51,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582350473] [2021-05-06 12:13:51,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:51,074 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:51,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:51,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:51,106 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:51,118 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:51,120 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:51,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:51,142 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:51,148 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:51,158 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:51,159 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:51,161 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:51,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,162 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:51,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:51,187 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:51,199 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:51,201 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:51,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:51,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:51,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:51,228 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:51,238 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:51,238 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:51,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:51,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:51,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:51,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:51,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:51,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:51,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:53,040 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:53,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582350473] [2021-05-06 12:13:53,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [582350473] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:53,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:53,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:13:53,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528420297] [2021-05-06 12:13:53,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:13:53,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:53,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:13:53,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=2319, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:13:53,041 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:56,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:56,055 INFO L93 Difference]: Finished difference Result 709 states and 823 transitions. [2021-05-06 12:13:56,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:13:56,055 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:13:56,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:56,056 INFO L225 Difference]: With dead ends: 709 [2021-05-06 12:13:56,056 INFO L226 Difference]: Without dead ends: 514 [2021-05-06 12:13:56,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 25 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1199 ImplicationChecksByTransitivity, 1768.6ms TimeCoverageRelationStatistics Valid=241, Invalid=2515, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:13:56,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2021-05-06 12:13:57,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 465. [2021-05-06 12:13:57,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:13:57,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:13:57,526 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:13:57,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:57,526 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:13:57,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:13:57,526 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:13:57,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:13:57,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:57,527 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:57,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1022 [2021-05-06 12:13:57,527 INFO L428 AbstractCegarLoop]: === Iteration 221 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:57,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:57,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1496516767, now seen corresponding path program 204 times [2021-05-06 12:13:57,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:57,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291263895] [2021-05-06 12:13:57,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:57,534 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:13:57,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:57,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:57,563 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:13:57,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:57,577 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:13:57,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,595 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:13:57,599 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:13:57,605 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:13:57,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:57,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:57,618 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:13:57,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:57,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:57,645 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:13:57,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:57,659 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:13:57,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:57,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:13:57,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:13:57,687 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:13:57,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:57,697 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:13:57,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:57,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:57,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:57,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:13:57,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:57,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:13:57,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:59,556 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:59,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291263895] [2021-05-06 12:13:59,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1291263895] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:59,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:59,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:13:59,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90509162] [2021-05-06 12:13:59,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:13:59,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:59,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:13:59,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2414, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:13:59,557 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:02,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:02,445 INFO L93 Difference]: Finished difference Result 706 states and 820 transitions. [2021-05-06 12:14:02,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:14:02,445 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:02,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:02,446 INFO L225 Difference]: With dead ends: 706 [2021-05-06 12:14:02,446 INFO L226 Difference]: Without dead ends: 511 [2021-05-06 12:14:02,446 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1823.4ms TimeCoverageRelationStatistics Valid=248, Invalid=2614, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:14:02,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-05-06 12:14:03,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 465. [2021-05-06 12:14:03,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:03,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:14:03,910 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:14:03,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:03,910 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:14:03,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:03,910 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:14:03,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:14:03,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:03,911 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:03,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1027 [2021-05-06 12:14:03,911 INFO L428 AbstractCegarLoop]: === Iteration 222 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:03,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:03,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1558556381, now seen corresponding path program 205 times [2021-05-06 12:14:03,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:03,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712568949] [2021-05-06 12:14:03,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:03,917 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:03,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:03,929 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:03,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:03,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:03,944 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:03,956 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:03,958 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:03,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:03,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:03,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:03,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:03,985 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:03,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:03,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:03,998 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:03,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:03,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:04,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:04,024 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:04,036 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:04,038 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:04,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:04,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:04,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:04,065 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:04,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:04,075 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:04,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:04,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:04,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:04,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:04,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:04,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:04,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:05,949 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:05,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712568949] [2021-05-06 12:14:05,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1712568949] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:05,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:05,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 12:14:05,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704705743] [2021-05-06 12:14:05,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 12:14:05,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:05,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 12:14:05,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=2511, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:14:05,950 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 51 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 49 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:09,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:09,393 INFO L93 Difference]: Finished difference Result 703 states and 817 transitions. [2021-05-06 12:14:09,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:14:09,394 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 49 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:09,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:09,394 INFO L225 Difference]: With dead ends: 703 [2021-05-06 12:14:09,394 INFO L226 Difference]: Without dead ends: 508 [2021-05-06 12:14:09,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1209 ImplicationChecksByTransitivity, 1828.9ms TimeCoverageRelationStatistics Valid=255, Invalid=2715, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:14:09,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-05-06 12:14:10,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 465. [2021-05-06 12:14:10,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:10,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:14:10,993 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:14:10,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:10,993 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:14:10,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 49 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:10,994 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:14:10,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:14:10,994 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:10,994 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:10,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1032 [2021-05-06 12:14:10,994 INFO L428 AbstractCegarLoop]: === Iteration 223 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:10,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:10,994 INFO L82 PathProgramCache]: Analyzing trace with hash -246881953, now seen corresponding path program 206 times [2021-05-06 12:14:10,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:10,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529660598] [2021-05-06 12:14:10,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:11,000 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:11,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:11,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:11,029 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:11,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:11,044 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:11,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,054 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:11,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:11,080 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:11,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:11,091 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:11,093 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:11,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:11,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:11,122 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:11,134 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:11,136 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:11,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:11,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:11,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:11,164 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:11,174 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:11,175 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:11,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:11,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:11,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:11,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:11,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:11,274 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:11,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:13,036 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:13,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529660598] [2021-05-06 12:14:13,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [529660598] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:13,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:13,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 12:14:13,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704468687] [2021-05-06 12:14:13,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 12:14:13,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:13,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 12:14:13,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=2610, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:14:13,037 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 52 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 50 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:16,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:16,132 INFO L93 Difference]: Finished difference Result 700 states and 814 transitions. [2021-05-06 12:14:16,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 12:14:16,133 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 50 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:16,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:16,133 INFO L225 Difference]: With dead ends: 700 [2021-05-06 12:14:16,133 INFO L226 Difference]: Without dead ends: 505 [2021-05-06 12:14:16,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1184 ImplicationChecksByTransitivity, 1828.6ms TimeCoverageRelationStatistics Valid=262, Invalid=2818, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 12:14:16,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-05-06 12:14:17,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 465. [2021-05-06 12:14:17,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:17,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:14:17,749 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:14:17,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:17,749 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:14:17,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 50 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:17,749 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:14:17,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:14:17,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:17,750 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:17,750 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1037 [2021-05-06 12:14:17,750 INFO L428 AbstractCegarLoop]: === Iteration 224 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:17,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:17,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1064530403, now seen corresponding path program 207 times [2021-05-06 12:14:17,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:17,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1861154611] [2021-05-06 12:14:17,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:17,762 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:17,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:17,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:17,792 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:17,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:17,806 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:17,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,816 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:17,828 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:17,835 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:17,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:17,846 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:17,848 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:17,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:17,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:17,877 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:17,889 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:17,891 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:17,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:17,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:17,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:17,920 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:17,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:17,931 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:17,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:18,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:18,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:18,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:18,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:18,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:18,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:19,832 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:19,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1861154611] [2021-05-06 12:14:19,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1861154611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:19,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:19,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 12:14:19,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140391561] [2021-05-06 12:14:19,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 12:14:19,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:19,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 12:14:19,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=2711, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:14:19,834 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 53 states, 53 states have (on average 1.490566037735849) internal successors, (79), 51 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:22,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:22,679 INFO L93 Difference]: Finished difference Result 697 states and 811 transitions. [2021-05-06 12:14:22,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 12:14:22,680 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.490566037735849) internal successors, (79), 51 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:22,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:22,680 INFO L225 Difference]: With dead ends: 697 [2021-05-06 12:14:22,680 INFO L226 Difference]: Without dead ends: 502 [2021-05-06 12:14:22,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1865.8ms TimeCoverageRelationStatistics Valid=269, Invalid=2923, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 12:14:22,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-06 12:14:24,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 465. [2021-05-06 12:14:24,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:24,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:14:24,168 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:14:24,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:24,168 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:14:24,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.490566037735849) internal successors, (79), 51 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:24,168 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:14:24,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:14:24,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:24,168 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:24,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1042 [2021-05-06 12:14:24,168 INFO L428 AbstractCegarLoop]: === Iteration 225 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:24,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:24,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1642088991, now seen corresponding path program 208 times [2021-05-06 12:14:24,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:24,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [571104424] [2021-05-06 12:14:24,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:24,174 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:24,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,186 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:24,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:24,202 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:24,214 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:24,216 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:24,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:24,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:24,244 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:24,253 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:24,254 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:24,256 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:24,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:24,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:24,283 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:24,295 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:24,297 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:24,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:24,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:24,318 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:24,325 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:24,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:24,335 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:24,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:24,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:24,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:24,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:24,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:24,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:24,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:26,205 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:26,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [571104424] [2021-05-06 12:14:26,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [571104424] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:26,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:26,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 12:14:26,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346009536] [2021-05-06 12:14:26,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 12:14:26,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:26,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 12:14:26,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=2814, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 12:14:26,206 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 54 states, 54 states have (on average 1.462962962962963) internal successors, (79), 52 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:29,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:29,701 INFO L93 Difference]: Finished difference Result 695 states and 809 transitions. [2021-05-06 12:14:29,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 12:14:29,701 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.462962962962963) internal successors, (79), 52 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:29,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:29,702 INFO L225 Difference]: With dead ends: 695 [2021-05-06 12:14:29,702 INFO L226 Difference]: Without dead ends: 500 [2021-05-06 12:14:29,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 20 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 1837.4ms TimeCoverageRelationStatistics Valid=276, Invalid=3030, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 12:14:29,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2021-05-06 12:14:31,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 465. [2021-05-06 12:14:31,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 450 states have (on average 1.1488888888888888) internal successors, (517), 453 states have internal predecessors, (517), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:31,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 534 transitions. [2021-05-06 12:14:31,246 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 534 transitions. Word has length 85 [2021-05-06 12:14:31,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:31,246 INFO L480 AbstractCegarLoop]: Abstraction has 465 states and 534 transitions. [2021-05-06 12:14:31,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.462962962962963) internal successors, (79), 52 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:31,246 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 534 transitions. [2021-05-06 12:14:31,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:14:31,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:31,247 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:31,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1047 [2021-05-06 12:14:31,247 INFO L428 AbstractCegarLoop]: === Iteration 226 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:31,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:31,247 INFO L82 PathProgramCache]: Analyzing trace with hash 630971741, now seen corresponding path program 209 times [2021-05-06 12:14:31,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:31,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709735840] [2021-05-06 12:14:31,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:31,252 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:31,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:31,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:31,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:31,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:31,279 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:31,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:31,294 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:31,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:31,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:31,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:31,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:31,323 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:31,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:31,334 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:31,335 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:31,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:31,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:31,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:31,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:31,363 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:31,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:31,373 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:31,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:31,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:31,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:31,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:31,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:31,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:31,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:33,279 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:33,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709735840] [2021-05-06 12:14:33,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1709735840] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:33,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:33,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 12:14:33,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445934798] [2021-05-06 12:14:33,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 12:14:33,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:33,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 12:14:33,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2918, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 12:14:33,280 INFO L87 Difference]: Start difference. First operand 465 states and 534 transitions. Second operand has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 53 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:36,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:36,770 INFO L93 Difference]: Finished difference Result 708 states and 826 transitions. [2021-05-06 12:14:36,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 12:14:36,770 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 53 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2021-05-06 12:14:36,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:36,771 INFO L225 Difference]: With dead ends: 708 [2021-05-06 12:14:36,771 INFO L226 Difference]: Without dead ends: 513 [2021-05-06 12:14:36,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1987.5ms TimeCoverageRelationStatistics Valid=314, Invalid=3592, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 12:14:36,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-06 12:14:38,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 468. [2021-05-06 12:14:38,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 453 states have (on average 1.1523178807947019) internal successors, (522), 456 states have internal predecessors, (522), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:38,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 539 transitions. [2021-05-06 12:14:38,425 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 539 transitions. Word has length 85 [2021-05-06 12:14:38,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:38,425 INFO L480 AbstractCegarLoop]: Abstraction has 468 states and 539 transitions. [2021-05-06 12:14:38,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 53 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:38,425 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 539 transitions. [2021-05-06 12:14:38,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 12:14:38,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:38,426 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:38,426 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1051 [2021-05-06 12:14:38,426 INFO L428 AbstractCegarLoop]: === Iteration 227 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:38,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:38,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1920344757, now seen corresponding path program 9 times [2021-05-06 12:14:38,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:38,426 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278192909] [2021-05-06 12:14:38,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:38,438 WARN L240 tifierPushTermWalker]: treesize reduction 80, result has 50.9 percent of original size [2021-05-06 12:14:38,482 WARN L245 tifierPushTermWalker]: treesize reduction 80, result has 50.9 percent of original size 83 [2021-05-06 12:14:38,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:38,515 WARN L240 tifierPushTermWalker]: treesize reduction 70, result has 54.2 percent of original size [2021-05-06 12:14:38,557 WARN L245 tifierPushTermWalker]: treesize reduction 70, result has 54.2 percent of original size 83 [2021-05-06 12:14:38,585 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:38,587 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:38,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:38,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:38,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:38,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:38,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:38,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:38,941 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:38,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278192909] [2021-05-06 12:14:38,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [278192909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:38,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:38,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:14:38,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646683794] [2021-05-06 12:14:38,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:14:38,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:38,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:14:38,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:14:38,942 INFO L87 Difference]: Start difference. First operand 468 states and 539 transitions. Second operand has 25 states, 25 states have (on average 3.0) internal successors, (75), 24 states have internal predecessors, (75), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:14:41,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:41,338 INFO L93 Difference]: Finished difference Result 805 states and 934 transitions. [2021-05-06 12:14:41,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:14:41,338 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.0) internal successors, (75), 24 states have internal predecessors, (75), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 87 [2021-05-06 12:14:41,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:41,338 INFO L225 Difference]: With dead ends: 805 [2021-05-06 12:14:41,339 INFO L226 Difference]: Without dead ends: 601 [2021-05-06 12:14:41,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 24 SyntacticMatches, 18 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 444.7ms TimeCoverageRelationStatistics Valid=353, Invalid=837, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:14:41,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-05-06 12:14:42,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 486. [2021-05-06 12:14:42,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 471 states have (on average 1.1528662420382165) internal successors, (543), 474 states have internal predecessors, (543), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:42,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 560 transitions. [2021-05-06 12:14:42,813 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 560 transitions. Word has length 87 [2021-05-06 12:14:42,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:42,813 INFO L480 AbstractCegarLoop]: Abstraction has 486 states and 560 transitions. [2021-05-06 12:14:42,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.0) internal successors, (75), 24 states have internal predecessors, (75), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:14:42,813 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 560 transitions. [2021-05-06 12:14:42,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:42,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:42,813 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:42,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1052 [2021-05-06 12:14:42,813 INFO L428 AbstractCegarLoop]: === Iteration 228 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:42,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:42,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1492238652, now seen corresponding path program 210 times [2021-05-06 12:14:42,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:42,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038999043] [2021-05-06 12:14:42,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:42,830 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:42,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:42,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:42,857 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:42,869 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:42,871 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:42,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:42,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:42,900 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:42,910 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:42,910 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:42,912 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:42,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:42,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:42,939 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:42,950 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:42,952 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:42,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:42,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:42,979 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:42,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:42,990 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:42,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:43,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:43,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:43,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:43,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:43,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:43,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:44,661 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:44,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038999043] [2021-05-06 12:14:44,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2038999043] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:44,661 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:44,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:14:44,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655193346] [2021-05-06 12:14:44,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:14:44,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:44,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:14:44,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1404, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:14:44,662 INFO L87 Difference]: Start difference. First operand 486 states and 560 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:48,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:48,083 INFO L93 Difference]: Finished difference Result 756 states and 882 transitions. [2021-05-06 12:14:48,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:14:48,083 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:48,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:48,084 INFO L225 Difference]: With dead ends: 756 [2021-05-06 12:14:48,084 INFO L226 Difference]: Without dead ends: 543 [2021-05-06 12:14:48,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 7 SyntacticMatches, 38 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 1809.0ms TimeCoverageRelationStatistics Valid=215, Invalid=2041, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:14:48,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-06 12:14:49,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 489. [2021-05-06 12:14:49,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 474 states have (on average 1.1540084388185654) internal successors, (547), 477 states have internal predecessors, (547), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:49,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 564 transitions. [2021-05-06 12:14:49,699 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 564 transitions. Word has length 88 [2021-05-06 12:14:49,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:49,699 INFO L480 AbstractCegarLoop]: Abstraction has 489 states and 564 transitions. [2021-05-06 12:14:49,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:49,699 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 564 transitions. [2021-05-06 12:14:49,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:49,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:49,700 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:49,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1057 [2021-05-06 12:14:49,700 INFO L428 AbstractCegarLoop]: === Iteration 229 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:49,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:49,700 INFO L82 PathProgramCache]: Analyzing trace with hash -284458628, now seen corresponding path program 2 times [2021-05-06 12:14:49,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:49,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980129678] [2021-05-06 12:14:49,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:49,706 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:49,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,718 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:49,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:49,735 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:49,746 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:49,749 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:49,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:49,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:49,777 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:49,786 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:49,787 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:49,789 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:49,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:49,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:49,816 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:49,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:49,830 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:49,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:49,848 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:49,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:49,858 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:49,868 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:49,869 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:49,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:49,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:49,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:49,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:49,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:49,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:49,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:50,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:51,500 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:51,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980129678] [2021-05-06 12:14:51,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [980129678] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:51,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:51,501 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:14:51,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733597008] [2021-05-06 12:14:51,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:14:51,501 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:51,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:14:51,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:14:51,501 INFO L87 Difference]: Start difference. First operand 489 states and 564 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:54,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:54,560 INFO L93 Difference]: Finished difference Result 536 states and 614 transitions. [2021-05-06 12:14:54,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:14:54,561 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:14:54,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:54,561 INFO L225 Difference]: With dead ends: 536 [2021-05-06 12:14:54,561 INFO L226 Difference]: Without dead ends: 534 [2021-05-06 12:14:54,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 6 SyntacticMatches, 39 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 1659.5ms TimeCoverageRelationStatistics Valid=218, Invalid=1852, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:14:54,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-06 12:14:56,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 492. [2021-05-06 12:14:56,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 477 states have (on average 1.1551362683438156) internal successors, (551), 480 states have internal predecessors, (551), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:14:56,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 568 transitions. [2021-05-06 12:14:56,143 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 568 transitions. Word has length 88 [2021-05-06 12:14:56,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:56,143 INFO L480 AbstractCegarLoop]: Abstraction has 492 states and 568 transitions. [2021-05-06 12:14:56,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:14:56,143 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 568 transitions. [2021-05-06 12:14:56,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:14:56,144 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:56,144 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 19, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:56,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1062 [2021-05-06 12:14:56,144 INFO L428 AbstractCegarLoop]: === Iteration 230 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:56,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:56,144 INFO L82 PathProgramCache]: Analyzing trace with hash 1478828156, now seen corresponding path program 211 times [2021-05-06 12:14:56,144 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:56,144 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740680122] [2021-05-06 12:14:56,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:56,150 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:14:56,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:56,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:56,177 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:14:56,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,191 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:14:56,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:14:56,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:14:56,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:14:56,229 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,230 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:56,232 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:14:56,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:56,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:56,259 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:14:56,271 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,274 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:14:56,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:56,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:14:56,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:14:56,302 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:14:56,312 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:56,313 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:14:56,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:56,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:56,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:56,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:14:56,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:56,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:56,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:57,991 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:57,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740680122] [2021-05-06 12:14:57,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1740680122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:57,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:57,992 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:14:57,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747399404] [2021-05-06 12:14:57,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:14:57,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:57,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:14:57,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1559, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:14:57,992 INFO L87 Difference]: Start difference. First operand 492 states and 568 transitions. Second operand has 40 states, 40 states have (on average 2.05) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:01,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:01,732 INFO L93 Difference]: Finished difference Result 793 states and 919 transitions. [2021-05-06 12:15:01,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:15:01,732 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.05) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:01,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:01,733 INFO L225 Difference]: With dead ends: 793 [2021-05-06 12:15:01,733 INFO L226 Difference]: Without dead ends: 580 [2021-05-06 12:15:01,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 6 SyntacticMatches, 38 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 1669.8ms TimeCoverageRelationStatistics Valid=178, Invalid=1802, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:15:01,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-06 12:15:03,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 545. [2021-05-06 12:15:03,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 530 states have (on average 1.139622641509434) internal successors, (604), 533 states have internal predecessors, (604), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:03,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 621 transitions. [2021-05-06 12:15:03,951 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 621 transitions. Word has length 88 [2021-05-06 12:15:03,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:03,951 INFO L480 AbstractCegarLoop]: Abstraction has 545 states and 621 transitions. [2021-05-06 12:15:03,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.05) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:03,951 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 621 transitions. [2021-05-06 12:15:03,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:03,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:03,952 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 18, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:03,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1067 [2021-05-06 12:15:03,952 INFO L428 AbstractCegarLoop]: === Iteration 231 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:03,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:03,952 INFO L82 PathProgramCache]: Analyzing trace with hash -207351682, now seen corresponding path program 212 times [2021-05-06 12:15:03,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:03,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255981148] [2021-05-06 12:15:03,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:03,958 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:03,969 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,970 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:03,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:03,987 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:03,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:04,001 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:04,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:04,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:04,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:04,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:04,030 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:04,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:04,042 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:04,044 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:04,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:04,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:04,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:04,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:04,077 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:04,089 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:04,091 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:04,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:04,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:04,101 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:04,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:04,119 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:04,129 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:04,130 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:04,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:04,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:04,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:04,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:04,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:04,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:04,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:05,977 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:05,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255981148] [2021-05-06 12:15:05,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1255981148] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:05,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:05,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:15:05,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364498715] [2021-05-06 12:15:05,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:15:05,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:05,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:15:05,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1636, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:15:05,978 INFO L87 Difference]: Start difference. First operand 545 states and 621 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:10,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:10,429 INFO L93 Difference]: Finished difference Result 840 states and 964 transitions. [2021-05-06 12:15:10,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:15:10,429 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:10,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:10,430 INFO L225 Difference]: With dead ends: 840 [2021-05-06 12:15:10,430 INFO L226 Difference]: Without dead ends: 627 [2021-05-06 12:15:10,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 37 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 1780.8ms TimeCoverageRelationStatistics Valid=180, Invalid=1800, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:15:10,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-05-06 12:15:12,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 548. [2021-05-06 12:15:12,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:12,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:15:12,682 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:15:12,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:12,682 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:15:12,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:12,682 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:15:12,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:12,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:12,682 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:12,682 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1072 [2021-05-06 12:15:12,682 INFO L428 AbstractCegarLoop]: === Iteration 232 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:12,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:12,683 INFO L82 PathProgramCache]: Analyzing trace with hash 471920572, now seen corresponding path program 213 times [2021-05-06 12:15:12,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:12,683 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527003896] [2021-05-06 12:15:12,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:12,689 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:12,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:12,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:12,717 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:12,729 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:12,731 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:12,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:12,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:12,759 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:12,769 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:12,769 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:12,771 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:12,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:12,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:12,800 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:12,812 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:12,814 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:12,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:12,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:12,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:12,843 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:12,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:12,860 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:12,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:12,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:12,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:12,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:12,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:12,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:12,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:14,647 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:14,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527003896] [2021-05-06 12:15:14,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [527003896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:14,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:14,647 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:15:14,647 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730299142] [2021-05-06 12:15:14,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:15:14,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:14,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:15:14,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1715, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:15:14,648 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:19,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:19,219 INFO L93 Difference]: Finished difference Result 843 states and 967 transitions. [2021-05-06 12:15:19,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:15:19,219 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:19,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:19,220 INFO L225 Difference]: With dead ends: 843 [2021-05-06 12:15:19,220 INFO L226 Difference]: Without dead ends: 630 [2021-05-06 12:15:19,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 8 SyntacticMatches, 34 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 913 ImplicationChecksByTransitivity, 1745.7ms TimeCoverageRelationStatistics Valid=187, Invalid=1883, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:15:19,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-05-06 12:15:21,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 548. [2021-05-06 12:15:21,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:21,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:15:21,475 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:15:21,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:21,475 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:15:21,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:21,475 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:15:21,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:21,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:21,476 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:21,476 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1077 [2021-05-06 12:15:21,476 INFO L428 AbstractCegarLoop]: === Iteration 233 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:21,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:21,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1032620350, now seen corresponding path program 214 times [2021-05-06 12:15:21,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:21,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486735556] [2021-05-06 12:15:21,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:21,482 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:21,494 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:21,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:21,515 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:21,527 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:21,529 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:21,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:21,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:21,557 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:21,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:21,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:21,569 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:21,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,571 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:21,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:21,595 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:21,607 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:21,609 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:21,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,619 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:21,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:21,631 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:21,638 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:21,648 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:21,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:21,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:21,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:21,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:21,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:21,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:21,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:21,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:23,457 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:23,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486735556] [2021-05-06 12:15:23,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [486735556] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:23,457 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:23,457 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:15:23,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600964240] [2021-05-06 12:15:23,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:15:23,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:23,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:15:23,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1796, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:15:23,458 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:27,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:27,806 INFO L93 Difference]: Finished difference Result 840 states and 964 transitions. [2021-05-06 12:15:27,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:15:27,807 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:27,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:27,807 INFO L225 Difference]: With dead ends: 840 [2021-05-06 12:15:27,807 INFO L226 Difference]: Without dead ends: 627 [2021-05-06 12:15:27,808 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 7 SyntacticMatches, 34 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1006 ImplicationChecksByTransitivity, 1764.8ms TimeCoverageRelationStatistics Valid=194, Invalid=1968, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:15:27,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-05-06 12:15:30,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 548. [2021-05-06 12:15:30,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:30,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:15:30,019 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:15:30,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:30,019 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:15:30,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:30,019 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:15:30,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:30,020 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:30,020 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:30,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1082 [2021-05-06 12:15:30,020 INFO L428 AbstractCegarLoop]: === Iteration 234 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:30,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:30,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1073295100, now seen corresponding path program 215 times [2021-05-06 12:15:30,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:30,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632416999] [2021-05-06 12:15:30,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:30,026 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:30,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:30,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:30,055 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:30,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,070 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:30,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:30,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:30,102 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:30,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,113 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:30,115 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:30,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:30,125 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:30,142 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:30,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,156 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:30,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:30,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:30,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:30,184 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:30,194 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:30,198 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:30,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:30,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:30,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:30,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:31,955 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:31,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632416999] [2021-05-06 12:15:31,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [632416999] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:31,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:31,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:15:31,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261232402] [2021-05-06 12:15:31,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:15:31,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:31,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:15:31,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1879, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:15:31,956 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:36,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:36,247 INFO L93 Difference]: Finished difference Result 837 states and 961 transitions. [2021-05-06 12:15:36,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:15:36,248 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:36,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:36,248 INFO L225 Difference]: With dead ends: 837 [2021-05-06 12:15:36,248 INFO L226 Difference]: Without dead ends: 624 [2021-05-06 12:15:36,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 7 SyntacticMatches, 33 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 1720.3ms TimeCoverageRelationStatistics Valid=201, Invalid=2055, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:15:36,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-06 12:15:38,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 548. [2021-05-06 12:15:38,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:38,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:15:38,719 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:15:38,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:38,719 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:15:38,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:38,719 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:15:38,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:38,720 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:38,720 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:38,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1087 [2021-05-06 12:15:38,720 INFO L428 AbstractCegarLoop]: === Iteration 235 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:38,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:38,720 INFO L82 PathProgramCache]: Analyzing trace with hash 1517195774, now seen corresponding path program 216 times [2021-05-06 12:15:38,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:38,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569634792] [2021-05-06 12:15:38,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:38,732 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:38,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:38,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:38,759 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:38,771 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:38,773 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:38,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:38,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:38,800 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:38,809 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:38,810 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:38,812 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:38,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,832 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:38,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:38,841 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:38,852 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:38,854 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:38,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:38,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:38,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:38,883 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:38,893 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:38,893 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:38,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:38,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:38,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:38,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:38,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:38,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:38,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:40,711 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:40,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569634792] [2021-05-06 12:15:40,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1569634792] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:40,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:40,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:15:40,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870863594] [2021-05-06 12:15:40,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:15:40,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:40,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:15:40,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1964, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:15:40,712 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:45,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:45,045 INFO L93 Difference]: Finished difference Result 834 states and 958 transitions. [2021-05-06 12:15:45,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:15:45,046 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:45,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:45,046 INFO L225 Difference]: With dead ends: 834 [2021-05-06 12:15:45,046 INFO L226 Difference]: Without dead ends: 621 [2021-05-06 12:15:45,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1156 ImplicationChecksByTransitivity, 1773.2ms TimeCoverageRelationStatistics Valid=208, Invalid=2144, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:15:45,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-06 12:15:47,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 548. [2021-05-06 12:15:47,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:47,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:15:47,401 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:15:47,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:47,401 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:15:47,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:47,401 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:15:47,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:47,401 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:47,401 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:47,401 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1092 [2021-05-06 12:15:47,402 INFO L428 AbstractCegarLoop]: === Iteration 236 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:47,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:47,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1036115516, now seen corresponding path program 217 times [2021-05-06 12:15:47,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:47,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171163899] [2021-05-06 12:15:47,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:47,407 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:47,419 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:47,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:47,435 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:47,447 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:47,449 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:47,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:47,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:47,477 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:47,487 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:47,488 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:47,490 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:47,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:47,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:47,521 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:47,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:47,535 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:47,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:47,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:47,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:47,564 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:47,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:47,574 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:47,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:47,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:47,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:47,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:47,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:47,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:47,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:49,394 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:49,394 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171163899] [2021-05-06 12:15:49,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [171163899] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:49,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:49,395 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:15:49,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187577624] [2021-05-06 12:15:49,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:15:49,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:49,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:15:49,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2051, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:15:49,395 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:53,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:53,848 INFO L93 Difference]: Finished difference Result 831 states and 955 transitions. [2021-05-06 12:15:53,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:15:53,848 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:15:53,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:53,848 INFO L225 Difference]: With dead ends: 831 [2021-05-06 12:15:53,849 INFO L226 Difference]: Without dead ends: 618 [2021-05-06 12:15:53,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 8 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1163 ImplicationChecksByTransitivity, 1776.0ms TimeCoverageRelationStatistics Valid=215, Invalid=2235, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:15:53,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2021-05-06 12:15:56,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 548. [2021-05-06 12:15:56,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:15:56,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:15:56,081 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:15:56,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:56,081 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:15:56,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:15:56,081 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:15:56,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:15:56,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:56,081 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:56,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1097 [2021-05-06 12:15:56,082 INFO L428 AbstractCegarLoop]: === Iteration 237 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:56,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:56,082 INFO L82 PathProgramCache]: Analyzing trace with hash 683027134, now seen corresponding path program 218 times [2021-05-06 12:15:56,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:56,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240564748] [2021-05-06 12:15:56,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:56,089 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:15:56,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:56,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:56,117 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:15:56,129 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:56,131 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:15:56,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:15:56,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:15:56,159 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:15:56,169 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:56,170 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:56,172 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:15:56,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:56,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:56,199 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:15:56,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:56,213 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:15:56,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:15:56,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:15:56,240 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:15:56,249 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:56,250 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:15:56,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:56,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:56,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:56,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:15:56,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:56,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:56,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:58,020 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:58,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240564748] [2021-05-06 12:15:58,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1240564748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:58,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:58,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:15:58,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365857887] [2021-05-06 12:15:58,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:15:58,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:58,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:15:58,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=2140, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:15:58,021 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:02,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:02,373 INFO L93 Difference]: Finished difference Result 828 states and 952 transitions. [2021-05-06 12:16:02,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:16:02,373 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:02,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:02,374 INFO L225 Difference]: With dead ends: 828 [2021-05-06 12:16:02,374 INFO L226 Difference]: Without dead ends: 615 [2021-05-06 12:16:02,374 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 8 SyntacticMatches, 29 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1203 ImplicationChecksByTransitivity, 1721.7ms TimeCoverageRelationStatistics Valid=222, Invalid=2328, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:16:02,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-05-06 12:16:04,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 548. [2021-05-06 12:16:04,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:04,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:04,597 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:04,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:04,597 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:04,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:04,597 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:04,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:04,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:04,598 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:04,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1102 [2021-05-06 12:16:04,598 INFO L428 AbstractCegarLoop]: === Iteration 238 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:04,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:04,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1366360708, now seen corresponding path program 219 times [2021-05-06 12:16:04,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:04,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517734439] [2021-05-06 12:16:04,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:04,604 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:04,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:04,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:04,632 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:04,643 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,646 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:04,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:04,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:04,675 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:04,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,685 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:04,690 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:04,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,705 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:04,714 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:04,730 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:04,741 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,743 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:04,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,745 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:04,754 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:04,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:04,771 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:04,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:04,781 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:04,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:04,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:04,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:04,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:04,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:04,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:06,658 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:06,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517734439] [2021-05-06 12:16:06,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [517734439] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:06,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:06,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:16:06,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910685586] [2021-05-06 12:16:06,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:16:06,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:06,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:16:06,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=2231, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:16:06,659 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:11,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:11,208 INFO L93 Difference]: Finished difference Result 825 states and 949 transitions. [2021-05-06 12:16:11,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:16:11,208 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:11,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:11,209 INFO L225 Difference]: With dead ends: 825 [2021-05-06 12:16:11,209 INFO L226 Difference]: Without dead ends: 612 [2021-05-06 12:16:11,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 8 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1234 ImplicationChecksByTransitivity, 1835.9ms TimeCoverageRelationStatistics Valid=229, Invalid=2423, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:16:11,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2021-05-06 12:16:13,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 548. [2021-05-06 12:16:13,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:13,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:13,354 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:13,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:13,354 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:13,354 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:13,354 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:13,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:13,354 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:13,354 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:13,354 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1107 [2021-05-06 12:16:13,355 INFO L428 AbstractCegarLoop]: === Iteration 239 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:13,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:13,355 INFO L82 PathProgramCache]: Analyzing trace with hash -942713986, now seen corresponding path program 220 times [2021-05-06 12:16:13,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:13,355 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1779896197] [2021-05-06 12:16:13,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:13,373 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:13,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:13,392 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:13,399 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:13,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:13,413 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:13,413 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:13,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:13,439 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:13,448 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:13,449 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:13,451 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:13,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:13,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:13,476 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:13,487 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:13,489 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:13,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:13,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:13,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:13,516 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:13,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:13,527 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:13,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:13,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:13,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:13,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:13,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:13,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:13,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:15,316 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:15,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1779896197] [2021-05-06 12:16:15,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1779896197] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:15,316 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:15,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:16:15,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973499899] [2021-05-06 12:16:15,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:16:15,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:15,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:16:15,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=2324, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:16:15,317 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:19,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:19,736 INFO L93 Difference]: Finished difference Result 822 states and 946 transitions. [2021-05-06 12:16:19,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:16:19,736 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:19,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:19,737 INFO L225 Difference]: With dead ends: 822 [2021-05-06 12:16:19,737 INFO L226 Difference]: Without dead ends: 609 [2021-05-06 12:16:19,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 8 SyntacticMatches, 27 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1256 ImplicationChecksByTransitivity, 1756.6ms TimeCoverageRelationStatistics Valid=236, Invalid=2520, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:16:19,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-05-06 12:16:21,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 548. [2021-05-06 12:16:21,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:21,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:21,889 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:21,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:21,889 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:21,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:21,889 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:21,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:21,889 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:21,889 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:21,889 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1112 [2021-05-06 12:16:21,889 INFO L428 AbstractCegarLoop]: === Iteration 240 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:21,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:21,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1972073284, now seen corresponding path program 221 times [2021-05-06 12:16:21,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:21,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965925904] [2021-05-06 12:16:21,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:21,898 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:21,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:21,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:21,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:21,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:21,927 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:21,939 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:21,941 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:21,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:21,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:21,952 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:21,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:21,970 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:21,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:21,982 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:21,984 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:21,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:21,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:22,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:22,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:22,013 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:22,025 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:22,027 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:22,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:22,036 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:22,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:22,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:22,055 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:22,065 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:22,065 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:22,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:22,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:22,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:22,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:22,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:22,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:22,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:23,941 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:23,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965925904] [2021-05-06 12:16:23,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1965925904] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:23,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:23,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:16:23,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622535483] [2021-05-06 12:16:23,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:16:23,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:23,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:16:23,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=2419, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:16:23,942 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 50 states, 50 states have (on average 1.64) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:27,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:27,978 INFO L93 Difference]: Finished difference Result 819 states and 943 transitions. [2021-05-06 12:16:27,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:16:27,978 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.64) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:27,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:27,979 INFO L225 Difference]: With dead ends: 819 [2021-05-06 12:16:27,979 INFO L226 Difference]: Without dead ends: 606 [2021-05-06 12:16:27,979 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 1842.7ms TimeCoverageRelationStatistics Valid=243, Invalid=2619, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:16:27,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2021-05-06 12:16:30,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 548. [2021-05-06 12:16:30,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:30,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:30,144 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:30,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:30,144 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:30,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.64) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:30,144 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:30,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:30,144 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:30,144 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:30,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1117 [2021-05-06 12:16:30,144 INFO L428 AbstractCegarLoop]: === Iteration 241 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:30,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:30,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1478888510, now seen corresponding path program 222 times [2021-05-06 12:16:30,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:30,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546699309] [2021-05-06 12:16:30,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:30,150 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:30,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:30,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:30,177 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:30,189 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,191 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:30,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:30,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:30,219 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:30,229 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,229 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:30,231 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:30,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:30,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:30,260 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:30,272 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,274 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:30,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:30,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:30,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:30,300 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:30,310 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:30,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:30,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:30,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:30,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:30,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:30,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:30,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:30,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:32,279 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:32,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546699309] [2021-05-06 12:16:32,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1546699309] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:32,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:32,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 12:16:32,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656416193] [2021-05-06 12:16:32,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 12:16:32,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:32,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 12:16:32,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=2516, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:16:32,280 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 49 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:36,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:36,606 INFO L93 Difference]: Finished difference Result 816 states and 940 transitions. [2021-05-06 12:16:36,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:16:36,606 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 49 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:36,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:36,607 INFO L225 Difference]: With dead ends: 816 [2021-05-06 12:16:36,607 INFO L226 Difference]: Without dead ends: 603 [2021-05-06 12:16:36,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 7 SyntacticMatches, 26 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1306 ImplicationChecksByTransitivity, 1929.4ms TimeCoverageRelationStatistics Valid=250, Invalid=2720, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:16:36,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2021-05-06 12:16:38,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 548. [2021-05-06 12:16:38,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:38,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:38,829 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:38,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:38,829 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:38,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 49 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:38,829 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:38,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:38,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:38,829 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:38,830 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1122 [2021-05-06 12:16:38,830 INFO L428 AbstractCegarLoop]: === Iteration 242 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:38,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:38,830 INFO L82 PathProgramCache]: Analyzing trace with hash 1753648124, now seen corresponding path program 223 times [2021-05-06 12:16:38,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:38,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860684498] [2021-05-06 12:16:38,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:38,836 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:38,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:38,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:38,864 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:38,876 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:38,878 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:38,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:38,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:38,905 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:38,915 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:38,916 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:38,918 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:38,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:38,928 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:38,944 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:38,955 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:38,957 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:38,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:38,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:38,992 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:39,006 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:39,007 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:39,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:39,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:39,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:39,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:39,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:39,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:39,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:40,929 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:40,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860684498] [2021-05-06 12:16:40,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [860684498] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:40,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:40,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 12:16:40,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174305804] [2021-05-06 12:16:40,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 12:16:40,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:40,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 12:16:40,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=2615, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:16:40,930 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 52 states, 52 states have (on average 1.5769230769230769) internal successors, (82), 50 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:45,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:45,100 INFO L93 Difference]: Finished difference Result 813 states and 937 transitions. [2021-05-06 12:16:45,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 12:16:45,100 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.5769230769230769) internal successors, (82), 50 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:45,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:45,101 INFO L225 Difference]: With dead ends: 813 [2021-05-06 12:16:45,101 INFO L226 Difference]: Without dead ends: 600 [2021-05-06 12:16:45,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 1886.2ms TimeCoverageRelationStatistics Valid=257, Invalid=2823, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 12:16:45,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2021-05-06 12:16:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 548. [2021-05-06 12:16:47,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:47,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:47,234 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:47,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:47,234 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:47,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.5769230769230769) internal successors, (82), 50 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:47,234 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:47,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:47,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:47,235 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:47,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1127 [2021-05-06 12:16:47,235 INFO L428 AbstractCegarLoop]: === Iteration 243 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:47,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:47,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1155115778, now seen corresponding path program 224 times [2021-05-06 12:16:47,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:47,235 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1637631177] [2021-05-06 12:16:47,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:47,243 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:47,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:47,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:47,270 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:47,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:47,284 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:47,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:47,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:47,312 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:47,321 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:47,322 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:47,324 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:47,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:47,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:47,353 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:47,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:47,373 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:47,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,374 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:47,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:47,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:47,411 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:47,425 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:47,426 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:47,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:47,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:47,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:47,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:47,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:47,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:47,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:49,487 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:49,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1637631177] [2021-05-06 12:16:49,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1637631177] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:49,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:49,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 12:16:49,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330355212] [2021-05-06 12:16:49,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 12:16:49,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:49,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 12:16:49,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2716, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:16:49,489 INFO L87 Difference]: Start difference. First operand 548 states and 624 transitions. Second operand has 53 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 51 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:53,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:53,456 INFO L93 Difference]: Finished difference Result 810 states and 934 transitions. [2021-05-06 12:16:53,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 12:16:53,456 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 51 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2021-05-06 12:16:53,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:53,457 INFO L225 Difference]: With dead ends: 810 [2021-05-06 12:16:53,457 INFO L226 Difference]: Without dead ends: 597 [2021-05-06 12:16:53,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1328 ImplicationChecksByTransitivity, 2014.0ms TimeCoverageRelationStatistics Valid=264, Invalid=2928, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 12:16:53,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-05-06 12:16:55,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 548. [2021-05-06 12:16:55,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 548 states, 533 states have (on average 1.1388367729831144) internal successors, (607), 536 states have internal predecessors, (607), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:16:55,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548 states to 548 states and 624 transitions. [2021-05-06 12:16:55,716 INFO L78 Accepts]: Start accepts. Automaton has 548 states and 624 transitions. Word has length 88 [2021-05-06 12:16:55,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:55,716 INFO L480 AbstractCegarLoop]: Abstraction has 548 states and 624 transitions. [2021-05-06 12:16:55,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 51 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:16:55,716 INFO L276 IsEmpty]: Start isEmpty. Operand 548 states and 624 transitions. [2021-05-06 12:16:55,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:16:55,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:55,717 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:55,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1132 [2021-05-06 12:16:55,717 INFO L428 AbstractCegarLoop]: === Iteration 244 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:55,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:55,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1093076164, now seen corresponding path program 225 times [2021-05-06 12:16:55,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:55,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1728142337] [2021-05-06 12:16:55,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:55,723 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size [2021-05-06 12:16:55,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:55,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:55,752 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.9 percent of original size 61 [2021-05-06 12:16:55,763 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:55,766 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size [2021-05-06 12:16:55,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:16:55,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:16:55,796 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 84.6 percent of original size 55 [2021-05-06 12:16:55,806 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:55,807 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:55,809 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size [2021-05-06 12:16:55,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:55,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:55,837 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 86.8 percent of original size 66 [2021-05-06 12:16:55,849 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:55,852 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size [2021-05-06 12:16:55,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:55,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:16:55,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 12:16:55,880 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 85.7 percent of original size 60 [2021-05-06 12:16:55,890 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:55,893 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:16:55,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:56,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:56,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:16:56,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:56,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:56,006 WARN L159 QuantifierPusher]: Ignoring assumption.