/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/sum01_bug02_sum01_bug02_base.case.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:10:10,855 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:10:10,858 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:10:10,897 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:10:10,952 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 11:10:10,962 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:10:10,962 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:10:10,965 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:10:10,965 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:10:10,965 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:10:10,965 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:10:10,965 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:10:10,965 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:10:10,966 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:10:10,966 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:10:10,966 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:10:10,967 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:10:10,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:10:10,968 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:10:10,968 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:10:10,968 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:10:10,968 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:10:10,968 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:10:11,269 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:10:11,307 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:10:11,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:10:11,310 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:10:11,312 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:10:11,312 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2021-05-06 11:10:11,406 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32a45bbdc/8553e8dca8154315bb524dc433f739e4/FLAGb942e5f1d [2021-05-06 11:10:11,862 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:10:11,863 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2021-05-06 11:10:11,867 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32a45bbdc/8553e8dca8154315bb524dc433f739e4/FLAGb942e5f1d [2021-05-06 11:10:12,356 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32a45bbdc/8553e8dca8154315bb524dc433f739e4 [2021-05-06 11:10:12,358 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:10:12,361 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:10:12,362 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:10:12,362 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:10:12,365 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:10:12,366 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,367 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@186eeaf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12, skipping insertion in model container [2021-05-06 11:10:12,367 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,373 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:10:12,384 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:10:12,498 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/sum01_bug02_sum01_bug02_base.case.i[834,847] [2021-05-06 11:10:12,506 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:10:12,512 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:10:12,551 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/sum01_bug02_sum01_bug02_base.case.i[834,847] [2021-05-06 11:10:12,559 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:10:12,570 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:10:12,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12 WrapperNode [2021-05-06 11:10:12,570 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:10:12,571 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:10:12,571 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:10:12,571 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:10:12,579 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,579 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,583 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,584 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,595 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,599 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,601 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (1/1) ... [2021-05-06 11:10:12,606 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:10:12,607 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:10:12,607 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:10:12,607 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:10:12,607 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (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 11:10:12,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:10:12,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:10:12,728 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:10:12,728 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:10:12,728 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:10:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:10:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:10:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 11:10:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 11:10:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:10:12,729 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:10:12,730 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:10:12,730 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-06 11:10:12,730 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:10:12,730 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:10:12,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:10:12,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:10:12,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:10:12,731 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:10:12,732 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:10:12,979 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:10:12,980 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:10:12,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:10:12 BoogieIcfgContainer [2021-05-06 11:10:12,981 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:10:12,982 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:10:12,982 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:10:12,984 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:10:12,984 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:10:12" (1/3) ... [2021-05-06 11:10:12,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6374a31c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:10:12, skipping insertion in model container [2021-05-06 11:10:12,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:10:12" (2/3) ... [2021-05-06 11:10:12,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6374a31c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:10:12, skipping insertion in model container [2021-05-06 11:10:12,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:10:12" (3/3) ... [2021-05-06 11:10:12,986 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01_bug02_sum01_bug02_base.case.i [2021-05-06 11:10:12,999 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:10:13,001 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:10:13,031 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:10:13,044 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:10:13,044 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:10:13,044 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:10:13,044 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:10:13,044 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:10:13,045 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:10:13,045 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:10:13,045 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:10:13,069 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:10:13,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:10:13,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:13,085 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:13,085 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:13,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:13,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2021-05-06 11:10:13,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:13,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659650558] [2021-05-06 11:10:13,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:13,173 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:13,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:13,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:13,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:13,294 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 11:10:13,296 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:13,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659650558] [2021-05-06 11:10:13,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1659650558] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:13,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:13,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:10:13,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775488026] [2021-05-06 11:10:13,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:10:13,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:13,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:10:13,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:10:13,309 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:13,358 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 11:10:13,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:10:13,360 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:10:13,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:13,364 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:10:13,364 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:10:13,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:10:13,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:10:13,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:10:13,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-06 11:10:13,393 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-06 11:10:13,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:13,393 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-06 11:10:13,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,394 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-06 11:10:13,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:10:13,395 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:13,395 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:13,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:10:13,396 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:13,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:13,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2021-05-06 11:10:13,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:13,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163969659] [2021-05-06 11:10:13,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:13,400 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:13,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:13,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:13,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:13,493 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 11:10:13,493 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:13,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163969659] [2021-05-06 11:10:13,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1163969659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:13,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:13,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:10:13,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854481988] [2021-05-06 11:10:13,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:10:13,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:13,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:10:13,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:10:13,496 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:13,615 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-06 11:10:13,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:10:13,616 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:10:13,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:13,616 INFO L225 Difference]: With dead ends: 20 [2021-05-06 11:10:13,616 INFO L226 Difference]: Without dead ends: 15 [2021-05-06 11:10:13,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 108.4ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:10:13,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-06 11:10:13,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-06 11:10:13,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-06 11:10:13,626 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-06 11:10:13,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:13,626 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-06 11:10:13,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,626 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-06 11:10:13,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:10:13,627 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:13,627 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:13,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:10:13,627 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:13,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:13,628 INFO L82 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2021-05-06 11:10:13,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:13,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83494369] [2021-05-06 11:10:13,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:13,690 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:13,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:13,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:13,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:13,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:13,742 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:13,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:13,753 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:10:13,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:13,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:13,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:13,812 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 11:10:13,850 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:13,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83494369] [2021-05-06 11:10:13,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [83494369] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:13,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:13,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:10:13,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15116822] [2021-05-06 11:10:13,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:10:13,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:13,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:10:13,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:10:13,851 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:13,980 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-05-06 11:10:13,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:10:13,980 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:10:13,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:13,981 INFO L225 Difference]: With dead ends: 24 [2021-05-06 11:10:13,981 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 11:10:13,982 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 122.9ms TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:10:13,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 11:10:13,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-06 11:10:13,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-06 11:10:13,985 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2021-05-06 11:10:13,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:13,985 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-06 11:10:13,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:13,986 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-06 11:10:13,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:10:13,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:13,986 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:13,986 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:10:13,986 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:13,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:13,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1968158987, now seen corresponding path program 1 times [2021-05-06 11:10:13,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:13,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736181513] [2021-05-06 11:10:13,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:13,996 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:14,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:14,042 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:14,057 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:14,076 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,080 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:10:14,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:14,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,164 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 11:10:14,278 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:14,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736181513] [2021-05-06 11:10:14,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [736181513] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:14,278 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:14,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:10:14,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901991551] [2021-05-06 11:10:14,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:10:14,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:14,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:10:14,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:10:14,280 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:14,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:14,628 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-05-06 11:10:14,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:10:14,629 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:10:14,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:14,629 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:10:14,629 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 11:10:14,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 388.4ms TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:10:14,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 11:10:14,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-06 11:10:14,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:14,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-06 11:10:14,633 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-06 11:10:14,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:14,634 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-06 11:10:14,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:14,634 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-06 11:10:14,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:10:14,634 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:14,634 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:14,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:10:14,634 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:14,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:14,635 INFO L82 PathProgramCache]: Analyzing trace with hash 80268138, now seen corresponding path program 1 times [2021-05-06 11:10:14,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:14,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55548799] [2021-05-06 11:10:14,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:14,644 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:14,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:14,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:14,695 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:14,713 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,714 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:10:14,720 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:14,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:14,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:14,768 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:14,785 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,792 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:14,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:14,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:14,822 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:14,829 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,830 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:14,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:14,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,934 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 11:10:14,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:15,123 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:15,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55548799] [2021-05-06 11:10:15,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [55548799] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:15,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:15,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:10:15,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107156616] [2021-05-06 11:10:15,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:10:15,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:15,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:10:15,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:10:15,125 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:15,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:15,514 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-05-06 11:10:15,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:10:15,515 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:10:15,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:15,515 INFO L225 Difference]: With dead ends: 27 [2021-05-06 11:10:15,515 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 11:10:15,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 503.6ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:10:15,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 11:10:15,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-06 11:10:15,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:15,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-06 11:10:15,520 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2021-05-06 11:10:15,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:15,520 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-06 11:10:15,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:15,520 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-06 11:10:15,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:10:15,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:15,521 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:15,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:10:15,521 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:15,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:15,521 INFO L82 PathProgramCache]: Analyzing trace with hash 520726699, now seen corresponding path program 2 times [2021-05-06 11:10:15,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:15,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703975013] [2021-05-06 11:10:15,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:15,531 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:15,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:15,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:15,560 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:15,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:15,572 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:15,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:15,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:15,614 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:15,632 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:15,634 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:15,638 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:15,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:15,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:15,685 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:15,703 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:15,710 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:15,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:15,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:15,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:15,736 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:15,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:15,747 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:15,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:15,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:15,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:15,850 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 11:10:15,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:16,065 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:16,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703975013] [2021-05-06 11:10:16,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1703975013] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:16,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:16,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:10:16,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432942780] [2021-05-06 11:10:16,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:10:16,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:16,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:10:16,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:10:16,067 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:16,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:16,457 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-06 11:10:16,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:10:16,458 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:10:16,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:16,458 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:10:16,458 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 11:10:16,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 523.6ms TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:10:16,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 11:10:16,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-05-06 11:10:16,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:16,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-06 11:10:16,462 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 20 [2021-05-06 11:10:16,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:16,463 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-06 11:10:16,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:16,463 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-06 11:10:16,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:10:16,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:16,463 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:16,463 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:10:16,464 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:16,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:16,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1999233235, now seen corresponding path program 3 times [2021-05-06 11:10:16,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:16,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996420637] [2021-05-06 11:10:16,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:16,473 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:16,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:16,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:16,499 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:16,506 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:16,510 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:16,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:16,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:16,553 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:16,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:16,575 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:16,580 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:16,596 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:16,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:16,650 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:16,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:16,676 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:16,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:16,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:16,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:16,710 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:16,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:16,718 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:16,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:16,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:16,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:16,806 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 11:10:16,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:17,026 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:17,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996420637] [2021-05-06 11:10:17,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [996420637] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:17,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:17,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:10:17,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478597946] [2021-05-06 11:10:17,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:10:17,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:17,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:10:17,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:10:17,028 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:17,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:17,466 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-06 11:10:17,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:10:17,466 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:10:17,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:17,467 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:10:17,467 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:10:17,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 548.5ms TimeCoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:10:17,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:10:17,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-06 11:10:17,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:17,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-06 11:10:17,472 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2021-05-06 11:10:17,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:17,472 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-06 11:10:17,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:17,472 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-06 11:10:17,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:10:17,473 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:17,473 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:17,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:10:17,473 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:17,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:17,473 INFO L82 PathProgramCache]: Analyzing trace with hash 703601160, now seen corresponding path program 4 times [2021-05-06 11:10:17,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:17,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020478286] [2021-05-06 11:10:17,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:17,484 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:17,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:17,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:17,535 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:17,542 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 11:10:17,548 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:17,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,551 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:17,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:17,595 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:17,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:17,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:17,619 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:17,620 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:17,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:17,664 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:17,682 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:17,689 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:17,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:17,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:17,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:17,717 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:17,724 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 11:10:17,725 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:17,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:17,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:17,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:17,806 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 11:10:17,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:18,058 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:18,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020478286] [2021-05-06 11:10:18,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1020478286] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:18,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:18,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:10:18,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398472540] [2021-05-06 11:10:18,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:10:18,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:18,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:10:18,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:10:18,060 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:18,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:18,576 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-05-06 11:10:18,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:10:18,576 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:10:18,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:18,578 INFO L225 Difference]: With dead ends: 35 [2021-05-06 11:10:18,578 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:10:18,582 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 633.0ms TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:10:18,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:10:18,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-05-06 11:10:18,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:18,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-06 11:10:18,592 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 23 [2021-05-06 11:10:18,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:18,592 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-06 11:10:18,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:18,592 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-06 11:10:18,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:10:18,593 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:18,593 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:18,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:10:18,593 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:18,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:18,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1816358774, now seen corresponding path program 5 times [2021-05-06 11:10:18,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:18,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631197093] [2021-05-06 11:10:18,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:18,620 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:18,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:18,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:18,648 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:18,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,673 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:18,675 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,692 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:18,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:18,726 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:18,744 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,747 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:18,769 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:18,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:18,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:18,831 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:18,850 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,856 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:18,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:18,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:18,893 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:18,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,904 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:18,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:18,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:19,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:19,003 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 11:10:19,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:19,289 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:19,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631197093] [2021-05-06 11:10:19,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1631197093] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:19,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:19,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:10:19,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141951408] [2021-05-06 11:10:19,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:10:19,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:19,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:10:19,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:10:19,292 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:19,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:19,863 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-06 11:10:19,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:10:19,864 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:10:19,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:19,865 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:10:19,865 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 11:10:19,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 710.8ms TimeCoverageRelationStatistics Valid=118, Invalid=812, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:10:19,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 11:10:19,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-06 11:10:19,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:19,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-06 11:10:19,871 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2021-05-06 11:10:19,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:19,871 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-06 11:10:19,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:19,872 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-06 11:10:19,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:10:19,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:19,872 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:19,872 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:10:19,873 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:19,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:19,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1596829813, now seen corresponding path program 6 times [2021-05-06 11:10:19,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:19,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109414387] [2021-05-06 11:10:19,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:19,887 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:19,888 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:19,890 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:19,903 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:19,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:19,918 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:19,926 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:19,934 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:19,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:19,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:19,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:19,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:19,986 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:20,006 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:20,008 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:20,012 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:20,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:20,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:20,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:20,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:20,061 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:20,078 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:20,082 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:20,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:20,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:20,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:20,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:20,104 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:20,127 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 11:10:20,128 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:20,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:20,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:20,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:20,215 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 11:10:20,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:20,505 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:20,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109414387] [2021-05-06 11:10:20,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1109414387] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:20,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:20,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:10:20,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736075027] [2021-05-06 11:10:20,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:10:20,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:20,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:10:20,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:10:20,508 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:21,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:21,041 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-05-06 11:10:21,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:10:21,041 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:10:21,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:21,042 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:10:21,042 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:10:21,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 673.2ms TimeCoverageRelationStatistics Valid=124, Invalid=932, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:10:21,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:10:21,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-05-06 11:10:21,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:21,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-06 11:10:21,067 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 26 [2021-05-06 11:10:21,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:21,067 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-06 11:10:21,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:21,067 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-06 11:10:21,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:10:21,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:21,068 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:21,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:10:21,068 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:21,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:21,068 INFO L82 PathProgramCache]: Analyzing trace with hash 178177549, now seen corresponding path program 7 times [2021-05-06 11:10:21,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:21,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541823833] [2021-05-06 11:10:21,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:21,078 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:21,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,124 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:21,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:21,128 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:21,135 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,140 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:21,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:21,163 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:21,185 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:21,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,204 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:21,207 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:21,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,222 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:21,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:21,251 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:21,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,274 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:21,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:21,291 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:21,310 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:21,318 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:21,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:21,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:21,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:21,415 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 11:10:21,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:21,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:21,716 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:21,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541823833] [2021-05-06 11:10:21,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1541823833] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:21,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:21,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:10:21,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495918261] [2021-05-06 11:10:21,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:10:21,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:21,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:10:21,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:10:21,718 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:22,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:22,339 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-06 11:10:22,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:10:22,339 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:10:22,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:22,340 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:10:22,340 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 11:10:22,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 760.8ms TimeCoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:10:22,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 11:10:22,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-05-06 11:10:22,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:22,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-06 11:10:22,344 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 26 [2021-05-06 11:10:22,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:22,344 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-06 11:10:22,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:22,344 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-06 11:10:22,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:10:22,357 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:22,357 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:22,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:10:22,357 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:22,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:22,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1057195816, now seen corresponding path program 8 times [2021-05-06 11:10:22,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:22,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232464971] [2021-05-06 11:10:22,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:22,364 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:22,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:22,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:22,404 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:22,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:22,415 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:22,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,438 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:22,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:22,487 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:22,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:22,510 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:22,514 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:22,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:22,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:22,579 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:22,601 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:22,613 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:22,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:22,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:22,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:22,650 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:22,659 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:22,660 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:22,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:22,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:22,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:22,742 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 11:10:22,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:23,080 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:23,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232464971] [2021-05-06 11:10:23,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [232464971] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:23,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:23,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:10:23,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979950459] [2021-05-06 11:10:23,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:10:23,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:23,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:10:23,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=404, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:10:23,081 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 20 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:23,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:23,712 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2021-05-06 11:10:23,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:10:23,718 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 11:10:23,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:23,718 INFO L225 Difference]: With dead ends: 41 [2021-05-06 11:10:23,718 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:10:23,719 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 769.5ms TimeCoverageRelationStatistics Valid=132, Invalid=1128, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:10:23,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:10:23,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-06 11:10:23,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:23,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-06 11:10:23,728 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 29 [2021-05-06 11:10:23,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:23,728 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-06 11:10:23,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:23,728 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-06 11:10:23,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:10:23,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:23,729 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:23,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:10:23,729 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:23,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:23,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1462764118, now seen corresponding path program 9 times [2021-05-06 11:10:23,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:23,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450798679] [2021-05-06 11:10:23,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:23,751 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:23,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,774 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:23,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:23,778 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:23,784 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:23,788 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:23,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:23,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:23,839 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:23,856 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:23,857 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:23,863 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:23,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:23,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:23,929 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:23,945 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:23,950 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:23,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:23,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:23,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:24,002 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:24,010 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:24,011 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:24,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:24,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:24,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:24,117 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 11:10:24,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:24,476 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:24,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450798679] [2021-05-06 11:10:24,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [450798679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:24,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:24,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:10:24,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431839378] [2021-05-06 11:10:24,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:10:24,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:24,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:10:24,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:10:24,477 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:25,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:25,315 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-05-06 11:10:25,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:10:25,316 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 11:10:25,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:25,318 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:10:25,319 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 11:10:25,319 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 923.9ms TimeCoverageRelationStatistics Valid=170, Invalid=1552, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:10:25,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 11:10:25,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-06 11:10:25,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:25,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-05-06 11:10:25,329 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 29 [2021-05-06 11:10:25,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:25,329 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-05-06 11:10:25,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:25,330 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-05-06 11:10:25,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 11:10:25,330 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:25,330 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:25,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:10:25,331 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:25,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:25,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1081757291, now seen corresponding path program 10 times [2021-05-06 11:10:25,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:25,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829041800] [2021-05-06 11:10:25,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:25,343 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:25,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:25,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:25,374 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:25,383 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,392 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:25,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:25,417 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:25,444 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:25,464 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,467 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:25,476 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:25,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:25,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:25,534 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:25,553 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,577 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:25,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,604 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:25,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:25,608 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:25,615 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 11:10:25,617 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:25,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:25,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:25,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:25,742 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 11:10:25,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:26,099 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:26,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829041800] [2021-05-06 11:10:26,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1829041800] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:26,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:26,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:10:26,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222565765] [2021-05-06 11:10:26,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:10:26,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:26,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:10:26,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:10:26,104 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 22 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:26,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:26,940 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-05-06 11:10:26,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:10:26,941 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 11:10:26,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:26,941 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:10:26,941 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 11:10:26,942 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 940.5ms TimeCoverageRelationStatistics Valid=161, Invalid=1561, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:10:26,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 11:10:26,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-06 11:10:26,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:26,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-06 11:10:26,946 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2021-05-06 11:10:26,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:26,946 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-06 11:10:26,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:26,946 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-06 11:10:26,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:10:26,946 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:26,947 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:26,947 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:10:26,947 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:26,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:26,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1646748600, now seen corresponding path program 11 times [2021-05-06 11:10:26,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:26,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851371761] [2021-05-06 11:10:26,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:26,957 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:26,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:26,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:26,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:26,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:26,979 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:26,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:26,991 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:27,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:27,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:27,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:27,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:27,046 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:27,064 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:27,065 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:27,069 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:27,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:27,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:27,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:27,100 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:27,114 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:27,136 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:27,141 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:27,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:27,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:27,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:27,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:27,175 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:27,183 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:27,184 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:27,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:27,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:27,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:27,259 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 11:10:27,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:27,664 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:27,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851371761] [2021-05-06 11:10:27,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1851371761] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:27,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:27,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:10:27,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681829261] [2021-05-06 11:10:27,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:10:27,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:27,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:10:27,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:10:27,674 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 24 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:28,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:28,530 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2021-05-06 11:10:28,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:10:28,530 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 11:10:28,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:28,531 INFO L225 Difference]: With dead ends: 47 [2021-05-06 11:10:28,531 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 11:10:28,532 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 988.8ms TimeCoverageRelationStatistics Valid=166, Invalid=1726, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:10:28,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 11:10:28,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-06 11:10:28,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:28,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-06 11:10:28,538 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 35 [2021-05-06 11:10:28,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:28,539 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-06 11:10:28,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:28,539 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-06 11:10:28,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:10:28,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:28,540 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:28,540 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:10:28,540 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:28,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:28,540 INFO L82 PathProgramCache]: Analyzing trace with hash 128258762, now seen corresponding path program 12 times [2021-05-06 11:10:28,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:28,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805225763] [2021-05-06 11:10:28,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:28,547 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:28,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:28,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:28,572 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:28,579 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:28,582 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:28,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:28,599 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:28,620 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:28,637 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:28,638 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:28,641 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:28,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:28,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:28,681 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:28,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:28,701 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:28,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:28,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:28,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:28,724 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:28,730 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 11:10:28,731 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:28,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:28,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:28,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:28,800 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 11:10:28,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:29,198 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:29,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805225763] [2021-05-06 11:10:29,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [805225763] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:29,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:29,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:10:29,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90710681] [2021-05-06 11:10:29,199 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:10:29,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:29,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:10:29,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=671, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:10:29,199 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:30,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:30,083 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-05-06 11:10:30,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:10:30,083 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 11:10:30,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:30,084 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:10:30,084 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 11:10:30,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 521 ImplicationChecksByTransitivity, 1011.1ms TimeCoverageRelationStatistics Valid=191, Invalid=1971, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:10:30,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 11:10:30,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-06 11:10:30,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:30,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-05-06 11:10:30,089 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2021-05-06 11:10:30,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:30,089 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-05-06 11:10:30,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:30,089 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-05-06 11:10:30,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:10:30,089 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:30,089 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:30,090 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:10:30,090 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:30,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:30,090 INFO L82 PathProgramCache]: Analyzing trace with hash -14703285, now seen corresponding path program 13 times [2021-05-06 11:10:30,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:30,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639516454] [2021-05-06 11:10:30,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:30,097 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:30,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:30,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:30,127 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:30,134 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 11:10:30,137 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:30,154 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:30,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:30,185 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:30,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:30,206 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:30,212 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:30,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:30,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:30,260 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:30,280 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:30,284 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:30,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,286 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:30,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:30,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:30,318 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:30,326 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 11:10:30,327 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:30,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:30,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:30,427 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 11:10:30,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:30,889 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:30,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639516454] [2021-05-06 11:10:30,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1639516454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:30,889 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:30,889 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:10:30,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360629612] [2021-05-06 11:10:30,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:10:30,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:30,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:10:30,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:10:30,890 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 26 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:31,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:31,836 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-06 11:10:31,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:10:31,837 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-06 11:10:31,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:31,837 INFO L225 Difference]: With dead ends: 50 [2021-05-06 11:10:31,837 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 11:10:31,838 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 1063.9ms TimeCoverageRelationStatistics Valid=199, Invalid=2153, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:10:31,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 11:10:31,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-06 11:10:31,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:31,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-06 11:10:31,843 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 38 [2021-05-06 11:10:31,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:31,843 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-06 11:10:31,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:31,844 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-06 11:10:31,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:10:31,844 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:31,844 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:31,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:10:31,844 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:31,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:31,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1760304077, now seen corresponding path program 14 times [2021-05-06 11:10:31,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:31,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775551932] [2021-05-06 11:10:31,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:31,851 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:31,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:31,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:31,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:31,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:31,873 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:31,879 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 11:10:31,882 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:31,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:31,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:31,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:31,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:31,930 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:31,947 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:31,948 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:31,951 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:31,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:31,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:31,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:31,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:31,991 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:32,008 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:32,012 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:32,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:32,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:32,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:32,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:32,037 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:32,043 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 11:10:32,044 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:32,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:32,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:32,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:32,117 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 11:10:32,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:32,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:32,591 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:32,591 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775551932] [2021-05-06 11:10:32,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1775551932] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:32,591 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:32,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:10:32,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744672850] [2021-05-06 11:10:32,592 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:10:32,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:32,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:10:32,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:10:32,593 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:33,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:33,595 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-06 11:10:33,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:10:33,595 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-06 11:10:33,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:33,596 INFO L225 Difference]: With dead ends: 48 [2021-05-06 11:10:33,596 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 11:10:33,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 1112.5ms TimeCoverageRelationStatistics Valid=186, Invalid=2264, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:10:33,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 11:10:33,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-06 11:10:33,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:33,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-05-06 11:10:33,602 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 38 [2021-05-06 11:10:33,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:33,602 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-05-06 11:10:33,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 25 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:33,602 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-05-06 11:10:33,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:10:33,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:33,603 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:33,603 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:10:33,603 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:33,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:33,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1217485160, now seen corresponding path program 15 times [2021-05-06 11:10:33,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:33,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501476945] [2021-05-06 11:10:33,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:33,610 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:33,622 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:33,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:33,636 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:33,642 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 11:10:33,645 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:33,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:33,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:33,686 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:33,701 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:33,702 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:33,705 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:33,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:33,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:33,742 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:33,760 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:33,768 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:33,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:33,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:33,797 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:33,804 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 11:10:33,805 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:33,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:33,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:33,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:33,879 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 11:10:33,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:33,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:34,452 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:34,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501476945] [2021-05-06 11:10:34,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [501476945] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:34,453 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:34,453 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:10:34,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888831258] [2021-05-06 11:10:34,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:10:34,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:34,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:10:34,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=846, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:10:34,454 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 28 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:35,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:35,667 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2021-05-06 11:10:35,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:10:35,668 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 11:10:35,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:35,668 INFO L225 Difference]: With dead ends: 53 [2021-05-06 11:10:35,668 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:10:35,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1360.6ms TimeCoverageRelationStatistics Valid=196, Invalid=2560, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:10:35,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:10:35,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-06 11:10:35,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:35,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-06 11:10:35,674 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 41 [2021-05-06 11:10:35,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:35,674 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-06 11:10:35,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:35,675 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-06 11:10:35,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:10:35,675 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:35,675 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:35,675 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:10:35,675 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:35,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:35,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1302474774, now seen corresponding path program 16 times [2021-05-06 11:10:35,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:35,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562470990] [2021-05-06 11:10:35,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:35,684 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:35,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:35,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:35,710 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:35,719 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:35,723 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:35,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:35,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:35,775 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:35,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:35,796 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:35,799 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:35,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,802 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:35,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:35,847 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:35,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:35,868 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:35,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,870 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:35,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:35,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:35,892 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:35,899 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:35,900 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:35,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:35,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:35,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:35,975 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 11:10:35,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:36,503 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:36,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562470990] [2021-05-06 11:10:36,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [562470990] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:36,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:36,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:10:36,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378923977] [2021-05-06 11:10:36,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:10:36,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:36,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:10:36,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=897, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:10:36,505 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 29 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:37,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:37,691 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2021-05-06 11:10:37,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:10:37,691 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 11:10:37,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:37,691 INFO L225 Difference]: With dead ends: 51 [2021-05-06 11:10:37,691 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 11:10:37,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 1321.1ms TimeCoverageRelationStatistics Valid=219, Invalid=2751, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:10:37,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 11:10:37,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-06 11:10:37,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:37,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-06 11:10:37,697 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2021-05-06 11:10:37,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:37,697 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-06 11:10:37,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:37,697 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-06 11:10:37,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:10:37,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:37,697 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:37,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:10:37,697 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:37,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:37,698 INFO L82 PathProgramCache]: Analyzing trace with hash 257971243, now seen corresponding path program 17 times [2021-05-06 11:10:37,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:37,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443891526] [2021-05-06 11:10:37,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:37,706 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:37,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:37,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:37,728 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:37,735 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 11:10:37,738 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:37,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:37,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:37,777 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:37,799 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:37,800 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:37,803 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:37,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:37,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:37,856 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:37,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:37,879 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:37,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:37,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:37,901 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:37,907 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:37,908 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:37,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:37,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:37,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:37,984 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 11:10:37,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:38,667 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:38,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443891526] [2021-05-06 11:10:38,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [443891526] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:38,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:38,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:10:38,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015030535] [2021-05-06 11:10:38,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:10:38,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:38,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:10:38,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=958, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:10:38,668 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:39,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:39,819 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2021-05-06 11:10:39,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:10:39,820 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-06 11:10:39,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:39,820 INFO L225 Difference]: With dead ends: 56 [2021-05-06 11:10:39,820 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 11:10:39,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 787 ImplicationChecksByTransitivity, 1448.7ms TimeCoverageRelationStatistics Valid=227, Invalid=2965, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:10:39,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 11:10:39,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 11:10:39,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:39,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-05-06 11:10:39,828 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 44 [2021-05-06 11:10:39,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:39,828 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-05-06 11:10:39,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:39,828 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-05-06 11:10:39,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:10:39,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:39,828 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:39,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:10:39,829 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:39,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:39,829 INFO L82 PathProgramCache]: Analyzing trace with hash 2032978605, now seen corresponding path program 18 times [2021-05-06 11:10:39,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:39,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [571962813] [2021-05-06 11:10:39,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:39,842 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:39,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:39,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:39,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:39,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:39,866 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:39,872 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:39,876 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:39,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:39,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:39,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:39,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:39,928 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:39,943 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:39,944 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:39,948 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:39,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:39,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:39,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:39,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:40,019 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:40,036 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:40,041 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:40,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:40,054 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:40,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:40,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:40,074 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:40,081 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 11:10:40,082 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:40,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:40,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:40,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:40,173 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 11:10:40,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:40,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:40,813 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:40,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [571962813] [2021-05-06 11:10:40,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [571962813] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:40,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:40,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:10:40,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821877065] [2021-05-06 11:10:40,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:10:40,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:40,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:10:40,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1022, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:10:40,815 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 31 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 29 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:42,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:42,165 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-05-06 11:10:42,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:10:42,165 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 29 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-06 11:10:42,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:42,166 INFO L225 Difference]: With dead ends: 54 [2021-05-06 11:10:42,166 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 11:10:42,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 1487.3ms TimeCoverageRelationStatistics Valid=233, Invalid=3189, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:10:42,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 11:10:42,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-06 11:10:42,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:42,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-05-06 11:10:42,171 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 44 [2021-05-06 11:10:42,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:42,172 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-05-06 11:10:42,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 29 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:42,172 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-05-06 11:10:42,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:10:42,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:42,172 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:42,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:10:42,172 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:42,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:42,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1613775224, now seen corresponding path program 19 times [2021-05-06 11:10:42,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:42,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741949172] [2021-05-06 11:10:42,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:42,178 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:42,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,189 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:42,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:42,201 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:42,207 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,210 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:42,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:42,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:42,247 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:42,265 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,267 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:42,270 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:42,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:42,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:42,306 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:42,323 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,326 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:42,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:42,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:42,347 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:42,355 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,356 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:42,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:42,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:42,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:42,418 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 11:10:42,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:43,057 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:43,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741949172] [2021-05-06 11:10:43,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [741949172] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:43,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:43,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:10:43,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865154093] [2021-05-06 11:10:43,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:10:43,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:43,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:10:43,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1087, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:10:43,058 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 32 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 30 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:44,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:44,406 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2021-05-06 11:10:44,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:10:44,406 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 30 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 11:10:44,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:44,407 INFO L225 Difference]: With dead ends: 59 [2021-05-06 11:10:44,407 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 11:10:44,408 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 11 SyntacticMatches, 4 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 935 ImplicationChecksByTransitivity, 1513.0ms TimeCoverageRelationStatistics Valid=241, Invalid=3419, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:10:44,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 11:10:44,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2021-05-06 11:10:44,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:44,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-05-06 11:10:44,412 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 47 [2021-05-06 11:10:44,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:44,413 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-05-06 11:10:44,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 30 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:44,413 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-05-06 11:10:44,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:10:44,413 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:44,413 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:44,413 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2021-05-06 11:10:44,413 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:44,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:44,413 INFO L82 PathProgramCache]: Analyzing trace with hash 161232138, now seen corresponding path program 20 times [2021-05-06 11:10:44,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:44,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612893333] [2021-05-06 11:10:44,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:44,420 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:44,432 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:44,445 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:44,447 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:44,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:44,459 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:44,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:44,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:44,501 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:44,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:44,523 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:44,526 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:44,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:44,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:44,567 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:44,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:44,591 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:44,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:44,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:44,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:44,616 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:44,622 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:44,623 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:44,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:44,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:44,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:44,690 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 11:10:44,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:45,401 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:45,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612893333] [2021-05-06 11:10:45,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [612893333] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:45,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:45,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:10:45,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123270589] [2021-05-06 11:10:45,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:10:45,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:45,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:10:45,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1166, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:10:45,403 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 31 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:46,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:46,877 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2021-05-06 11:10:46,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:10:46,877 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.34375) internal successors, (43), 31 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 11:10:46,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:46,878 INFO L225 Difference]: With dead ends: 57 [2021-05-06 11:10:46,878 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 11:10:46,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 9 SyntacticMatches, 6 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1680.6ms TimeCoverageRelationStatistics Valid=226, Invalid=3680, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:10:46,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 11:10:46,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-06 11:10:46,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:46,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-06 11:10:46,885 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2021-05-06 11:10:46,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:46,885 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-06 11:10:46,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.34375) internal successors, (43), 31 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:46,885 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-06 11:10:46,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:10:46,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:46,885 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:46,886 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:10:46,886 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:46,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:46,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1252369653, now seen corresponding path program 21 times [2021-05-06 11:10:46,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:46,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562148164] [2021-05-06 11:10:46,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:46,892 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:46,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:46,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:46,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:46,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:46,920 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:46,928 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:46,933 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:46,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:46,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:46,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:46,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:46,983 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:46,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,000 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:47,002 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:47,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:47,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:47,042 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:47,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,067 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:47,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:47,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:47,095 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:47,101 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,102 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:47,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:47,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,175 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 11:10:47,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:47,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:47,946 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:47,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562148164] [2021-05-06 11:10:47,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1562148164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:47,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:47,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:10:47,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923547794] [2021-05-06 11:10:47,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:10:47,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:47,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:10:47,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1164, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:10:47,948 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 34 states, 33 states have (on average 1.393939393939394) internal successors, (46), 32 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:49,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:49,480 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2021-05-06 11:10:49,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:10:49,481 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.393939393939394) internal successors, (46), 32 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:10:49,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:49,482 INFO L225 Difference]: With dead ends: 62 [2021-05-06 11:10:49,482 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 11:10:49,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 1733.7ms TimeCoverageRelationStatistics Valid=236, Invalid=3796, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:10:49,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 11:10:49,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2021-05-06 11:10:49,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:49,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-05-06 11:10:49,490 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 50 [2021-05-06 11:10:49,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:49,491 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-05-06 11:10:49,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.393939393939394) internal successors, (46), 32 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:49,491 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-05-06 11:10:49,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:10:49,491 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:49,491 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:49,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2021-05-06 11:10:49,492 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:49,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:49,492 INFO L82 PathProgramCache]: Analyzing trace with hash 522637709, now seen corresponding path program 22 times [2021-05-06 11:10:49,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:49,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1681111990] [2021-05-06 11:10:49,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:49,500 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:49,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:49,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:49,532 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:49,540 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:49,544 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:49,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:49,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:49,591 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:49,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:49,613 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:49,616 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:49,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,645 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:49,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:49,665 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:49,681 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:49,686 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:49,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:49,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:49,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:49,716 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:49,724 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 11:10:49,725 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:49,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:49,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:49,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:49,801 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 11:10:49,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:50,548 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:50,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1681111990] [2021-05-06 11:10:50,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1681111990] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:50,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:50,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:10:50,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782149864] [2021-05-06 11:10:50,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:10:50,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:50,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:10:50,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1296, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:10:50,551 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 35 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 33 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:52,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:52,213 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-05-06 11:10:52,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:10:52,213 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 33 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:10:52,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:52,214 INFO L225 Difference]: With dead ends: 60 [2021-05-06 11:10:52,214 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 11:10:52,215 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1086 ImplicationChecksByTransitivity, 1812.7ms TimeCoverageRelationStatistics Valid=261, Invalid=4161, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:10:52,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 11:10:52,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-06 11:10:52,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 49 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:52,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2021-05-06 11:10:52,221 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 50 [2021-05-06 11:10:52,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:52,221 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2021-05-06 11:10:52,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 33 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:52,221 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2021-05-06 11:10:52,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:10:52,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:52,221 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:52,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2021-05-06 11:10:52,222 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:52,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:52,222 INFO L82 PathProgramCache]: Analyzing trace with hash -2102015064, now seen corresponding path program 23 times [2021-05-06 11:10:52,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:52,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086516134] [2021-05-06 11:10:52,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:52,229 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:52,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:52,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:52,255 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:52,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,266 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:52,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:52,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:52,312 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:52,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,332 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:52,336 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:52,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:52,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:52,379 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:52,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,401 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:52,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:52,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:52,427 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:52,433 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,434 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:52,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:52,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:52,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:52,505 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 11:10:52,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:52,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:53,332 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:53,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086516134] [2021-05-06 11:10:53,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086516134] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:53,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:53,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:10:53,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203256242] [2021-05-06 11:10:53,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:10:53,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:53,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:10:53,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1382, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:10:53,333 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand has 36 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:55,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:55,079 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2021-05-06 11:10:55,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:10:55,079 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 11:10:55,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:55,080 INFO L225 Difference]: With dead ends: 65 [2021-05-06 11:10:55,080 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:10:55,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 1962.0ms TimeCoverageRelationStatistics Valid=244, Invalid=4448, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:10:55,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:10:55,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-06 11:10:55,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:55,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-06 11:10:55,085 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 53 [2021-05-06 11:10:55,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:55,085 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-06 11:10:55,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:55,086 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-06 11:10:55,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:10:55,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:55,086 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:55,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:10:55,086 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:55,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:55,086 INFO L82 PathProgramCache]: Analyzing trace with hash -327007702, now seen corresponding path program 24 times [2021-05-06 11:10:55,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:55,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545261858] [2021-05-06 11:10:55,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:55,092 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:55,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:55,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:55,121 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:55,127 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 11:10:55,130 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:55,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:55,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:55,169 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:55,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:55,186 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:55,188 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:55,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:55,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:55,224 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:55,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:55,243 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:55,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:55,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:55,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:55,269 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:55,277 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 11:10:55,277 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:55,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:55,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:55,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:55,360 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 11:10:55,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:56,340 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:56,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545261858] [2021-05-06 11:10:56,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [545261858] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:56,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:56,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:10:56,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27767775] [2021-05-06 11:10:56,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:10:56,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:56,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:10:56,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1458, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:10:56,342 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 37 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:58,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:58,324 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-06 11:10:58,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:10:58,325 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 11:10:58,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:58,325 INFO L225 Difference]: With dead ends: 63 [2021-05-06 11:10:58,325 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 11:10:58,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1007 ImplicationChecksByTransitivity, 2272.4ms TimeCoverageRelationStatistics Valid=250, Invalid=4720, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:10:58,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 11:10:58,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-05-06 11:10:58,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:58,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-05-06 11:10:58,331 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2021-05-06 11:10:58,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:58,331 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-05-06 11:10:58,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:58,332 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-05-06 11:10:58,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:10:58,332 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:58,332 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:58,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2021-05-06 11:10:58,332 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:58,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:58,332 INFO L82 PathProgramCache]: Analyzing trace with hash 648788459, now seen corresponding path program 25 times [2021-05-06 11:10:58,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:58,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014676748] [2021-05-06 11:10:58,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:58,338 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:10:58,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:58,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:58,359 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:10:58,366 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:58,369 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:10:58,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:10:58,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:10:58,411 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:10:58,431 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:58,432 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:58,435 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:10:58,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:58,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:58,483 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:10:58,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:58,502 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:10:58,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:58,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:58,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:58,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:10:58,534 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 11:10:58,535 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:58,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:58,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:58,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:58,606 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 11:10:58,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:58,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:59,500 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:59,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014676748] [2021-05-06 11:10:59,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2014676748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:59,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:59,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:10:59,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273904188] [2021-05-06 11:10:59,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:10:59,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:59,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:10:59,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1536, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:10:59,501 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 38 states, 37 states have (on average 1.4054054054054055) internal successors, (52), 36 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:01,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:01,442 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2021-05-06 11:11:01,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:11:01,442 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.4054054054054055) internal successors, (52), 36 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-06 11:11:01,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:01,443 INFO L225 Difference]: With dead ends: 68 [2021-05-06 11:11:01,443 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 11:11:01,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 2099.9ms TimeCoverageRelationStatistics Valid=256, Invalid=5000, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:11:01,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 11:11:01,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-05-06 11:11:01,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:01,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2021-05-06 11:11:01,449 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 56 [2021-05-06 11:11:01,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:01,449 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2021-05-06 11:11:01,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.4054054054054055) internal successors, (52), 36 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:01,449 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2021-05-06 11:11:01,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:11:01,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:01,450 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:01,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2021-05-06 11:11:01,450 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:01,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:01,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1871171475, now seen corresponding path program 26 times [2021-05-06 11:11:01,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:01,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704207772] [2021-05-06 11:11:01,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:01,457 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:01,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:01,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:01,478 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:01,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:01,487 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:01,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:01,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:01,523 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:01,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:01,542 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:01,545 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:01,557 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:01,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:01,587 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:01,603 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:01,606 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:01,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:01,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:01,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:01,628 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:01,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:01,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:01,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:01,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:01,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:01,698 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 11:11:01,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:02,561 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:02,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704207772] [2021-05-06 11:11:02,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [704207772] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:02,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:02,562 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:11:02,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72530979] [2021-05-06 11:11:02,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:11:02,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:02,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:11:02,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:11:02,562 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 39 states, 38 states have (on average 1.368421052631579) internal successors, (52), 37 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:04,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:04,223 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2021-05-06 11:11:04,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:11:04,224 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.368421052631579) internal successors, (52), 37 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-06 11:11:04,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:04,224 INFO L225 Difference]: With dead ends: 66 [2021-05-06 11:11:04,224 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 11:11:04,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 14 SyntacticMatches, 5 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1258 ImplicationChecksByTransitivity, 1862.9ms TimeCoverageRelationStatistics Valid=270, Invalid=5132, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:11:04,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 11:11:04,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-05-06 11:11:04,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:04,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-05-06 11:11:04,231 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 56 [2021-05-06 11:11:04,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:04,231 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-05-06 11:11:04,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 1.368421052631579) internal successors, (52), 37 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:04,231 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-05-06 11:11:04,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:11:04,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:04,231 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:04,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 11:11:04,232 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:04,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:04,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1860534472, now seen corresponding path program 27 times [2021-05-06 11:11:04,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:04,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083895232] [2021-05-06 11:11:04,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:04,243 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:04,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:04,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:04,266 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:04,272 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 11:11:04,276 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:04,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:04,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:04,344 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:04,366 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:04,367 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:04,370 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:04,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:04,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:04,412 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:04,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:04,433 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:04,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:04,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:04,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:04,452 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:04,458 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 11:11:04,458 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:04,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:04,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:04,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:04,518 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 11:11:04,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:04,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:05,400 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:05,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083895232] [2021-05-06 11:11:05,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2083895232] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:05,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:05,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:11:05,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954458144] [2021-05-06 11:11:05,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:11:05,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:05,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:11:05,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:11:05,417 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 40 states, 39 states have (on average 1.4102564102564104) internal successors, (55), 38 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:07,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:07,510 INFO L93 Difference]: Finished difference Result 71 states and 75 transitions. [2021-05-06 11:11:07,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:11:07,510 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.4102564102564104) internal successors, (55), 38 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 11:11:07,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:07,511 INFO L225 Difference]: With dead ends: 71 [2021-05-06 11:11:07,511 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 11:11:07,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1461 ImplicationChecksByTransitivity, 2140.3ms TimeCoverageRelationStatistics Valid=297, Invalid=5555, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:11:07,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 11:11:07,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-05-06 11:11:07,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:07,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-06 11:11:07,519 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 59 [2021-05-06 11:11:07,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:07,519 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-06 11:11:07,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.4102564102564104) internal successors, (55), 38 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:07,520 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-06 11:11:07,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:11:07,520 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:07,520 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:07,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2021-05-06 11:11:07,520 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:07,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:07,521 INFO L82 PathProgramCache]: Analyzing trace with hash -659425462, now seen corresponding path program 28 times [2021-05-06 11:11:07,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:07,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81274641] [2021-05-06 11:11:07,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:07,528 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:07,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:07,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:07,549 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:07,556 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 11:11:07,558 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:07,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:07,584 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:07,600 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:07,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:07,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:07,619 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:07,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:07,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:07,664 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:07,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:07,688 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:07,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:07,714 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:07,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:07,718 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:07,725 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:07,725 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:07,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:07,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:07,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:07,795 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 11:11:07,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:08,759 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:08,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81274641] [2021-05-06 11:11:08,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [81274641] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:08,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:08,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:11:08,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841557446] [2021-05-06 11:11:08,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:11:08,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:08,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:11:08,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:11:08,761 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 41 states, 40 states have (on average 1.375) internal successors, (55), 39 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:10,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:10,599 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-05-06 11:11:10,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:11:10,599 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.375) internal successors, (55), 39 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 11:11:10,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:10,599 INFO L225 Difference]: With dead ends: 69 [2021-05-06 11:11:10,600 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 11:11:10,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1531 ImplicationChecksByTransitivity, 2075.8ms TimeCoverageRelationStatistics Valid=303, Invalid=5859, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:11:10,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 11:11:10,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-06 11:11:10,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:10,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-06 11:11:10,606 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-06 11:11:10,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:10,606 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-06 11:11:10,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.375) internal successors, (55), 39 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:10,606 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-06 11:11:10,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:11:10,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:10,606 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:10,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2021-05-06 11:11:10,607 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:10,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:10,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1785884875, now seen corresponding path program 29 times [2021-05-06 11:11:10,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:10,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485715423] [2021-05-06 11:11:10,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:10,613 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:10,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:10,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:10,635 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:10,641 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 11:11:10,644 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:10,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:10,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:10,679 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:10,696 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:10,698 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:10,701 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:10,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:10,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:10,738 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:10,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:10,758 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:10,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:10,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:10,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:10,788 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:10,795 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 11:11:10,795 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:10,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:10,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:10,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:10,855 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 11:11:10,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:11,838 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:11,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485715423] [2021-05-06 11:11:11,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [485715423] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:11,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:11,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:11:11,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157279059] [2021-05-06 11:11:11,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:11:11,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:11,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:11:11,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1776, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:11:11,840 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 42 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 40 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:13,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:13,849 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2021-05-06 11:11:13,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:11:13,850 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 40 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 11:11:13,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:13,850 INFO L225 Difference]: With dead ends: 74 [2021-05-06 11:11:13,850 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 11:11:13,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1462 ImplicationChecksByTransitivity, 2213.1ms TimeCoverageRelationStatistics Valid=292, Invalid=6028, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:11:13,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 11:11:13,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2021-05-06 11:11:13,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:13,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-05-06 11:11:13,857 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 62 [2021-05-06 11:11:13,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:13,857 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-05-06 11:11:13,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 40 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:13,857 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-05-06 11:11:13,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:11:13,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:13,857 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:13,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 11:11:13,857 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:13,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:13,858 INFO L82 PathProgramCache]: Analyzing trace with hash -734075059, now seen corresponding path program 30 times [2021-05-06 11:11:13,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:13,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450808667] [2021-05-06 11:11:13,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:13,864 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:13,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:13,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:13,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:13,885 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:13,887 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:13,893 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 11:11:13,896 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:13,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:13,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:13,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:13,911 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:13,931 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:13,948 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:13,948 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:13,951 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:13,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:13,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:13,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:13,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:13,991 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:14,007 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:14,011 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:14,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,023 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:14,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:14,034 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:14,040 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 11:11:14,040 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:14,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:14,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:14,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:14,096 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 11:11:14,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:15,075 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:15,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450808667] [2021-05-06 11:11:15,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [450808667] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:15,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:15,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:11:15,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958700433] [2021-05-06 11:11:15,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:11:15,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:15,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:11:15,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1862, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:11:15,077 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 43 states, 42 states have (on average 1.380952380952381) internal successors, (58), 41 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:17,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:17,213 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2021-05-06 11:11:17,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:11:17,214 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.380952380952381) internal successors, (58), 41 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 11:11:17,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:17,214 INFO L225 Difference]: With dead ends: 72 [2021-05-06 11:11:17,214 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 11:11:17,215 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 2279.0ms TimeCoverageRelationStatistics Valid=298, Invalid=6344, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:11:17,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 11:11:17,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-05-06 11:11:17,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:17,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2021-05-06 11:11:17,221 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2021-05-06 11:11:17,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:17,221 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2021-05-06 11:11:17,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 42 states have (on average 1.380952380952381) internal successors, (58), 41 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:17,221 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2021-05-06 11:11:17,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:11:17,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:17,222 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:17,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2021-05-06 11:11:17,222 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:17,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:17,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1602167320, now seen corresponding path program 31 times [2021-05-06 11:11:17,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:17,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878785483] [2021-05-06 11:11:17,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:17,228 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:17,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:17,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:17,248 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:17,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:17,257 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:17,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,270 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,279 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:17,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:17,296 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:17,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:17,317 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:17,319 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:17,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:17,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:17,358 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:17,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:17,378 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:17,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:17,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:17,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:17,401 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:17,408 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:17,409 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:17,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:17,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:17,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:17,475 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 11:11:17,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:17,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:18,500 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:18,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878785483] [2021-05-06 11:11:18,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1878785483] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:18,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:18,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:11:18,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40995454] [2021-05-06 11:11:18,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:11:18,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:18,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:11:18,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=2029, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:11:18,501 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand has 44 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 42 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:20,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:20,776 INFO L93 Difference]: Finished difference Result 77 states and 81 transitions. [2021-05-06 11:11:20,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:11:20,776 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 42 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:11:20,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:20,777 INFO L225 Difference]: With dead ends: 77 [2021-05-06 11:11:20,777 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 11:11:20,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1748 ImplicationChecksByTransitivity, 2390.9ms TimeCoverageRelationStatistics Valid=325, Invalid=6815, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:11:20,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 11:11:20,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2021-05-06 11:11:20,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:20,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-06 11:11:20,784 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 65 [2021-05-06 11:11:20,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:20,784 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-06 11:11:20,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 42 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:20,784 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-06 11:11:20,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:11:20,784 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:20,784 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:20,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159 [2021-05-06 11:11:20,784 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:20,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:20,785 INFO L82 PathProgramCache]: Analyzing trace with hash 172840042, now seen corresponding path program 32 times [2021-05-06 11:11:20,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:20,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496456910] [2021-05-06 11:11:20,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:20,791 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:20,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:20,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:20,814 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:20,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:20,823 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:20,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:20,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:20,862 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:20,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:20,879 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:20,884 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:20,895 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:20,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:20,921 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:20,938 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:20,941 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:20,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:20,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:20,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:20,963 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:20,970 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:20,970 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:20,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:21,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:21,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:21,029 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 11:11:21,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:22,055 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:22,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496456910] [2021-05-06 11:11:22,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1496456910] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:22,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:22,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:11:22,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447829860] [2021-05-06 11:11:22,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:11:22,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:22,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:11:22,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=2039, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:11:22,056 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 45 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:24,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:24,452 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2021-05-06 11:11:24,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:11:24,452 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:11:24,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:24,453 INFO L225 Difference]: With dead ends: 75 [2021-05-06 11:11:24,453 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 11:11:24,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2445.9ms TimeCoverageRelationStatistics Valid=312, Invalid=6998, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:11:24,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 11:11:24,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-05-06 11:11:24,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:24,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-06 11:11:24,461 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-06 11:11:24,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:24,461 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-06 11:11:24,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:24,461 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-06 11:11:24,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:11:24,462 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:24,462 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:24,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 11:11:24,462 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:24,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:24,462 INFO L82 PathProgramCache]: Analyzing trace with hash 961314731, now seen corresponding path program 33 times [2021-05-06 11:11:24,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:24,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436495472] [2021-05-06 11:11:24,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:24,468 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:24,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:24,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:24,491 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:24,497 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:24,500 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:24,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:24,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:24,539 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:24,556 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:24,557 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:24,559 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:24,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:24,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:24,597 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:24,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:24,619 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:24,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:24,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:24,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:24,642 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:24,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:24,649 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:24,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:24,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:24,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:24,724 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 11:11:24,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:25,914 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:25,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436495472] [2021-05-06 11:11:25,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [436495472] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:25,914 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:25,914 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:11:25,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335866618] [2021-05-06 11:11:25,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:11:25,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:25,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:11:25,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2214, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:11:25,915 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 46 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 44 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:28,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:28,502 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2021-05-06 11:11:28,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:11:28,503 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 44 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-06 11:11:28,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:28,503 INFO L225 Difference]: With dead ends: 80 [2021-05-06 11:11:28,503 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 11:11:28,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1923 ImplicationChecksByTransitivity, 2742.6ms TimeCoverageRelationStatistics Valid=339, Invalid=7493, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:11:28,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 11:11:28,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2021-05-06 11:11:28,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:28,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-05-06 11:11:28,511 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 68 [2021-05-06 11:11:28,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:28,511 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-05-06 11:11:28,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 44 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:28,511 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-05-06 11:11:28,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:11:28,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:28,512 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:28,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable169 [2021-05-06 11:11:28,512 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:28,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:28,512 INFO L82 PathProgramCache]: Analyzing trace with hash -1558645203, now seen corresponding path program 34 times [2021-05-06 11:11:28,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:28,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920630710] [2021-05-06 11:11:28,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:28,518 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:28,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:28,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:28,541 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:28,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:28,550 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:28,551 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:28,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:28,587 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:28,603 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:28,604 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:28,606 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:28,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:28,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:28,641 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:28,658 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:28,661 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:28,662 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:28,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:28,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:28,681 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:28,687 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 11:11:28,688 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:28,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:28,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:28,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:28,752 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 11:11:28,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:29,902 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:29,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920630710] [2021-05-06 11:11:29,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1920630710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:29,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:29,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:11:29,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294732832] [2021-05-06 11:11:29,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:11:29,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:29,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:11:29,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2328, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:11:29,903 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 47 states, 46 states have (on average 1.391304347826087) internal successors, (64), 45 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:32,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:32,506 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2021-05-06 11:11:32,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:11:32,506 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.391304347826087) internal successors, (64), 45 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-06 11:11:32,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:32,507 INFO L225 Difference]: With dead ends: 78 [2021-05-06 11:11:32,507 INFO L226 Difference]: Without dead ends: 73 [2021-05-06 11:11:32,507 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1574 ImplicationChecksByTransitivity, 2776.2ms TimeCoverageRelationStatistics Valid=310, Invalid=7880, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:11:32,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-06 11:11:32,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2021-05-06 11:11:32,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:32,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2021-05-06 11:11:32,521 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 68 [2021-05-06 11:11:32,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:32,521 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2021-05-06 11:11:32,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 46 states have (on average 1.391304347826087) internal successors, (64), 45 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:32,522 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2021-05-06 11:11:32,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:11:32,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:32,522 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:32,522 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2021-05-06 11:11:32,522 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:32,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:32,522 INFO L82 PathProgramCache]: Analyzing trace with hash 841605896, now seen corresponding path program 35 times [2021-05-06 11:11:32,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:32,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775769947] [2021-05-06 11:11:32,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:32,528 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:32,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:32,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:32,551 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:32,557 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:32,560 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:32,571 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:32,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:32,598 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:32,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:32,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:32,617 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:32,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,619 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:32,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:32,653 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:32,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:32,673 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:32,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:32,692 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:32,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:32,695 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:32,702 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:32,702 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:32,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:32,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:32,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:32,768 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 11:11:32,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:32,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:33,983 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:33,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775769947] [2021-05-06 11:11:33,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [775769947] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:33,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:33,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:11:33,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173805732] [2021-05-06 11:11:33,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:11:33,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:33,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:11:33,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=2426, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:11:33,984 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand has 48 states, 47 states have (on average 1.425531914893617) internal successors, (67), 46 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:36,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:36,822 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-05-06 11:11:36,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:11:36,822 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.425531914893617) internal successors, (67), 46 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:11:36,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:36,823 INFO L225 Difference]: With dead ends: 83 [2021-05-06 11:11:36,823 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 11:11:36,823 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 2966.0ms TimeCoverageRelationStatistics Valid=316, Invalid=8240, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:11:36,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 11:11:36,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2021-05-06 11:11:36,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:36,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-05-06 11:11:36,841 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 71 [2021-05-06 11:11:36,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:36,841 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-05-06 11:11:36,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 47 states have (on average 1.425531914893617) internal successors, (67), 46 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:36,841 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-05-06 11:11:36,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:11:36,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:36,842 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:36,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 11:11:36,842 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:36,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:36,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1678354038, now seen corresponding path program 36 times [2021-05-06 11:11:36,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:36,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429730115] [2021-05-06 11:11:36,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:36,848 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:36,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:36,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:36,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:36,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:36,870 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:36,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:36,882 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:36,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:36,884 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:36,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:36,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:36,924 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:36,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:36,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:36,949 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:36,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:36,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:36,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:36,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:36,991 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:37,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:37,016 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:37,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:37,031 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:37,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:37,042 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:37,043 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:37,051 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:37,052 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:37,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:37,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:37,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:37,126 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 11:11:37,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:38,298 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:38,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429730115] [2021-05-06 11:11:38,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [429730115] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:38,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:38,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:11:38,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791948406] [2021-05-06 11:11:38,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:11:38,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:38,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:11:38,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=2507, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:11:38,299 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 49 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 47 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:40,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:40,909 INFO L93 Difference]: Finished difference Result 81 states and 83 transitions. [2021-05-06 11:11:40,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:11:40,909 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 47 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:11:40,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:40,910 INFO L225 Difference]: With dead ends: 81 [2021-05-06 11:11:40,910 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 11:11:40,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 18 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2217 ImplicationChecksByTransitivity, 2713.0ms TimeCoverageRelationStatistics Valid=359, Invalid=8571, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:11:40,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 11:11:40,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-06 11:11:40,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:40,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-06 11:11:40,918 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 71 [2021-05-06 11:11:40,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:40,918 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-06 11:11:40,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 47 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:40,918 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-06 11:11:40,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:11:40,918 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:40,918 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:40,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable184 [2021-05-06 11:11:40,919 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:40,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:40,919 INFO L82 PathProgramCache]: Analyzing trace with hash -581441909, now seen corresponding path program 37 times [2021-05-06 11:11:40,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:40,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559063066] [2021-05-06 11:11:40,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:40,925 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:40,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:40,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:40,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:40,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:40,947 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:40,953 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 11:11:40,955 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:40,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:40,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:40,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:40,970 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:40,995 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:41,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,013 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:41,016 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:41,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:41,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:41,052 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:41,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,073 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:41,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:41,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:41,094 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:41,100 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,101 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:41,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:41,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:41,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:41,157 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 11:11:41,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:42,358 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:42,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559063066] [2021-05-06 11:11:42,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [559063066] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:42,358 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:42,358 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:11:42,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376830896] [2021-05-06 11:11:42,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:11:42,359 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:42,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:11:42,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2516, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:11:42,359 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 50 states, 49 states have (on average 1.4285714285714286) internal successors, (70), 48 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:45,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:45,115 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2021-05-06 11:11:45,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:11:45,116 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.4285714285714286) internal successors, (70), 48 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:11:45,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:45,116 INFO L225 Difference]: With dead ends: 86 [2021-05-06 11:11:45,116 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 11:11:45,117 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2082 ImplicationChecksByTransitivity, 2826.1ms TimeCoverageRelationStatistics Valid=348, Invalid=8772, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 11:11:45,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 11:11:45,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2021-05-06 11:11:45,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:45,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-06 11:11:45,125 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 74 [2021-05-06 11:11:45,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:45,125 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-06 11:11:45,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 1.4285714285714286) internal successors, (70), 48 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:45,125 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-06 11:11:45,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:11:45,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:45,125 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:45,125 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable189 [2021-05-06 11:11:45,125 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:45,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:45,126 INFO L82 PathProgramCache]: Analyzing trace with hash 1193565453, now seen corresponding path program 38 times [2021-05-06 11:11:45,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:45,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836805949] [2021-05-06 11:11:45,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:45,132 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:45,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:45,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:45,154 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:45,160 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:45,163 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:45,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:45,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:45,199 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:45,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:45,222 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:45,224 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:45,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:45,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:45,261 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:45,277 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:45,280 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:45,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:45,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:45,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:45,300 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:45,306 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:45,307 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:45,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:45,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:45,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:45,363 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 11:11:45,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:46,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:46,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836805949] [2021-05-06 11:11:46,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [836805949] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:46,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:46,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:11:46,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931427304] [2021-05-06 11:11:46,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:11:46,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:46,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:11:46,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2712, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:11:46,583 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 51 states, 50 states have (on average 1.4) internal successors, (70), 49 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:49,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:49,418 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2021-05-06 11:11:49,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:11:49,419 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.4) internal successors, (70), 49 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:11:49,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:49,419 INFO L225 Difference]: With dead ends: 84 [2021-05-06 11:11:49,419 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 11:11:49,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2364 ImplicationChecksByTransitivity, 2880.2ms TimeCoverageRelationStatistics Valid=373, Invalid=9329, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:11:49,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 11:11:49,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2021-05-06 11:11:49,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:49,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2021-05-06 11:11:49,428 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 74 [2021-05-06 11:11:49,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:49,428 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2021-05-06 11:11:49,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 50 states have (on average 1.4) internal successors, (70), 49 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:49,429 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2021-05-06 11:11:49,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:11:49,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:49,429 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:49,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2021-05-06 11:11:49,429 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:49,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:49,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1023578152, now seen corresponding path program 39 times [2021-05-06 11:11:49,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:49,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805787963] [2021-05-06 11:11:49,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:49,436 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:49,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:49,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:49,464 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:49,471 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:49,474 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:49,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:49,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:49,513 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:49,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:49,531 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:49,533 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:49,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:49,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:49,576 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:49,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:49,600 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:49,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:49,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:49,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:49,629 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:49,635 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:49,636 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:49,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:49,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:49,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:49,692 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 11:11:49,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:51,001 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:51,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805787963] [2021-05-06 11:11:51,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1805787963] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:51,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:51,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:11:51,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115823274] [2021-05-06 11:11:51,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:11:51,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:51,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:11:51,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2817, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:11:51,002 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand has 52 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 50 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:54,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:54,109 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2021-05-06 11:11:54,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:11:54,109 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 50 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:11:54,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:54,109 INFO L225 Difference]: With dead ends: 89 [2021-05-06 11:11:54,109 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 11:11:54,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 3118.6ms TimeCoverageRelationStatistics Valid=381, Invalid=9719, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:11:54,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 11:11:54,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-05-06 11:11:54,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:54,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-06 11:11:54,118 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 77 [2021-05-06 11:11:54,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:54,118 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-06 11:11:54,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 51 states have (on average 1.4313725490196079) internal successors, (73), 50 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:54,118 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-06 11:11:54,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:11:54,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:54,118 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:54,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable199 [2021-05-06 11:11:54,119 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:54,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:54,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1496381782, now seen corresponding path program 40 times [2021-05-06 11:11:54,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:54,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832040499] [2021-05-06 11:11:54,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:54,124 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:54,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,138 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:54,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:54,149 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:54,157 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:54,160 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:54,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,162 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:54,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:54,195 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:54,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:54,212 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:54,215 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:54,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:54,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:54,249 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:54,265 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:54,268 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:54,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,270 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:54,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:54,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:54,290 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:54,298 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:54,299 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:54,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:54,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:54,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:54,357 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 11:11:54,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:54,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:55,781 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:55,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832040499] [2021-05-06 11:11:55,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1832040499] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:55,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:55,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:11:55,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501539372] [2021-05-06 11:11:55,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:11:55,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:55,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:11:55,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2925, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:11:55,783 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 53 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 51 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:58,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:58,891 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-06 11:11:58,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:11:58,892 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 51 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:11:58,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:58,892 INFO L225 Difference]: With dead ends: 87 [2021-05-06 11:11:58,892 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 11:11:58,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2580 ImplicationChecksByTransitivity, 3213.0ms TimeCoverageRelationStatistics Valid=387, Invalid=10119, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:11:58,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 11:11:58,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-06 11:11:58,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:58,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2021-05-06 11:11:58,901 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2021-05-06 11:11:58,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:58,901 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2021-05-06 11:11:58,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 51 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:58,901 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2021-05-06 11:11:58,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:11:58,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:58,902 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:58,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable204 [2021-05-06 11:11:58,902 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:58,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:58,902 INFO L82 PathProgramCache]: Analyzing trace with hash 305309035, now seen corresponding path program 41 times [2021-05-06 11:11:58,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:58,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1171544271] [2021-05-06 11:11:58,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:58,908 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:11:58,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:58,922 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:58,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:58,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:58,934 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:11:58,941 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:58,943 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:11:58,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:58,945 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:58,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:11:58,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:11:58,983 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:11:59,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:59,002 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:59,004 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:11:59,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:59,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:59,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:59,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:59,045 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:11:59,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:59,081 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:11:59,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:59,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:59,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:59,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:59,105 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:11:59,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:59,112 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:59,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:59,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:59,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:59,215 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 11:11:59,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:59,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:01,434 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:01,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1171544271] [2021-05-06 11:12:01,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1171544271] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:01,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:01,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:12:01,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278370991] [2021-05-06 11:12:01,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:12:01,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:01,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:12:01,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=3056, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:12:01,436 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 54 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 52 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:04,813 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-05-06 11:12:04,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:12:04,814 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 52 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:12:04,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:04,814 INFO L225 Difference]: With dead ends: 92 [2021-05-06 11:12:04,814 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 11:12:04,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 22 SyntacticMatches, 4 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2044 ImplicationChecksByTransitivity, 4246.7ms TimeCoverageRelationStatistics Valid=352, Invalid=10568, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:12:04,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 11:12:04,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2021-05-06 11:12:04,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 77 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2021-05-06 11:12:04,823 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 80 [2021-05-06 11:12:04,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:04,823 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2021-05-06 11:12:04,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 52 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,823 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2021-05-06 11:12:04,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:12:04,824 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:04,824 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:04,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209 [2021-05-06 11:12:04,824 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:04,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:04,824 INFO L82 PathProgramCache]: Analyzing trace with hash 2080316397, now seen corresponding path program 42 times [2021-05-06 11:12:04,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:04,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91112877] [2021-05-06 11:12:04,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:04,830 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:04,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:04,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:04,853 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:04,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,863 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:04,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:04,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:04,897 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:04,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,914 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:04,916 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:04,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:04,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:04,952 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:04,968 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,971 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:04,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:04,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:04,995 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:05,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:05,002 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:05,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:05,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:05,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:05,056 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 11:12:05,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:06,481 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:06,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91112877] [2021-05-06 11:12:06,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [91112877] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:06,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:06,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:12:06,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569391481] [2021-05-06 11:12:06,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:12:06,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:06,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:12:06,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=3146, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:12:06,483 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 53 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:09,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:09,946 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-05-06 11:12:09,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:12:09,947 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 53 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:12:09,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:09,947 INFO L225 Difference]: With dead ends: 90 [2021-05-06 11:12:09,947 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 11:12:09,948 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2753 ImplicationChecksByTransitivity, 3413.1ms TimeCoverageRelationStatistics Valid=401, Invalid=10941, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:12:09,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 11:12:09,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2021-05-06 11:12:09,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:09,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2021-05-06 11:12:09,956 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 80 [2021-05-06 11:12:09,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:09,956 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2021-05-06 11:12:09,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 53 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:09,957 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2021-05-06 11:12:09,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:12:09,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:09,957 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:09,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable214 [2021-05-06 11:12:09,957 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:09,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:09,957 INFO L82 PathProgramCache]: Analyzing trace with hash -122886840, now seen corresponding path program 43 times [2021-05-06 11:12:09,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:09,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257101086] [2021-05-06 11:12:09,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:09,963 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:09,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:09,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:09,983 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:09,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:09,986 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:09,993 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 11:12:09,996 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:09,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:09,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:10,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:10,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:10,032 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:10,049 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:10,050 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:10,052 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:10,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:10,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:10,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:10,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:10,089 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:10,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:10,110 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:10,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:10,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:10,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:10,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:10,135 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:10,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:10,143 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:10,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:10,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:10,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:10,199 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 11:12:10,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:11,623 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:11,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257101086] [2021-05-06 11:12:11,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [257101086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:11,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:11,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:12:11,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737693823] [2021-05-06 11:12:11,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:12:11,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:11,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:12:11,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=3259, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:12:11,633 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 56 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 54 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:14,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:14,979 INFO L93 Difference]: Finished difference Result 95 states and 99 transitions. [2021-05-06 11:12:14,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:12:14,979 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 54 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:12:14,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:14,980 INFO L225 Difference]: With dead ends: 95 [2021-05-06 11:12:14,980 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:12:14,981 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2841 ImplicationChecksByTransitivity, 3267.2ms TimeCoverageRelationStatistics Valid=409, Invalid=11363, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:12:14,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:12:14,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2021-05-06 11:12:14,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:14,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-06 11:12:14,990 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 83 [2021-05-06 11:12:14,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:14,990 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-06 11:12:14,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 54 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:14,990 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-06 11:12:14,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:12:14,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:14,990 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:14,990 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable219 [2021-05-06 11:12:14,990 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:14,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:14,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1652120522, now seen corresponding path program 44 times [2021-05-06 11:12:14,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:14,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562571455] [2021-05-06 11:12:14,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:14,996 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:14,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:14,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:15,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:15,016 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:15,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:15,025 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:15,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:15,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:15,062 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:15,079 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:15,080 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:15,082 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:15,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:15,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:15,120 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:15,138 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:15,141 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:15,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:15,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:15,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:15,162 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:15,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:15,169 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:15,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:15,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:15,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:15,224 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 11:12:15,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:15,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:16,686 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:16,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562571455] [2021-05-06 11:12:16,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [562571455] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:16,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:16,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:12:16,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619612506] [2021-05-06 11:12:16,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:12:16,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:16,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:12:16,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3375, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:12:16,695 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 57 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 55 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:20,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:20,067 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-05-06 11:12:20,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:12:20,068 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 55 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:12:20,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:20,068 INFO L225 Difference]: With dead ends: 93 [2021-05-06 11:12:20,068 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 11:12:20,074 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2989 ImplicationChecksByTransitivity, 3400.8ms TimeCoverageRelationStatistics Valid=415, Invalid=11795, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:12:20,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 11:12:20,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-06 11:12:20,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:20,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-06 11:12:20,083 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-06 11:12:20,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:20,084 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-06 11:12:20,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 55 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:20,084 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-06 11:12:20,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 11:12:20,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:20,085 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:20,085 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable224 [2021-05-06 11:12:20,087 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:20,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:20,087 INFO L82 PathProgramCache]: Analyzing trace with hash -453329845, now seen corresponding path program 45 times [2021-05-06 11:12:20,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:20,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859823] [2021-05-06 11:12:20,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:20,093 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:20,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:20,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:20,113 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:20,119 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:20,122 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:20,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:20,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:20,156 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:20,172 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:20,173 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:20,177 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:20,188 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:20,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:20,213 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:20,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:20,235 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:20,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:20,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:20,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:20,260 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:20,267 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:20,268 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:20,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:20,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:20,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:20,324 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 11:12:20,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:20,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:21,919 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:21,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859823] [2021-05-06 11:12:21,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1859823] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:21,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:21,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:12:21,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343260135] [2021-05-06 11:12:21,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:12:21,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:21,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:12:21,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=3492, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:12:21,920 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 58 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 56 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:25,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:25,596 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2021-05-06 11:12:25,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:12:25,596 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 56 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-06 11:12:25,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:25,596 INFO L225 Difference]: With dead ends: 98 [2021-05-06 11:12:25,597 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 11:12:25,597 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3084 ImplicationChecksByTransitivity, 3693.6ms TimeCoverageRelationStatistics Valid=423, Invalid=12233, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 11:12:25,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 11:12:25,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2021-05-06 11:12:25,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:25,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2021-05-06 11:12:25,607 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 86 [2021-05-06 11:12:25,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:25,607 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2021-05-06 11:12:25,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 56 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:25,607 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2021-05-06 11:12:25,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 11:12:25,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:25,607 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:25,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable229 [2021-05-06 11:12:25,607 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:25,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:25,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1321677517, now seen corresponding path program 46 times [2021-05-06 11:12:25,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:25,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174490388] [2021-05-06 11:12:25,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:25,614 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:25,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,626 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:25,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:25,637 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:25,643 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 11:12:25,646 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:25,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:25,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:25,682 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:25,698 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:25,699 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:25,702 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:25,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:25,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:25,739 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:25,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:25,759 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:25,759 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:25,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:25,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:25,778 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:25,785 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:25,785 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:25,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:25,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:25,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:25,854 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 11:12:25,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:27,630 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:27,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174490388] [2021-05-06 11:12:27,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [174490388] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:27,630 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:27,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:12:27,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999768328] [2021-05-06 11:12:27,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:12:27,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:27,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:12:27,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=3636, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:12:27,631 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 59 states, 58 states have (on average 1.4137931034482758) internal successors, (82), 57 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:31,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:31,680 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2021-05-06 11:12:31,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:12:31,680 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.4137931034482758) internal successors, (82), 57 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-06 11:12:31,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:31,681 INFO L225 Difference]: With dead ends: 96 [2021-05-06 11:12:31,681 INFO L226 Difference]: Without dead ends: 91 [2021-05-06 11:12:31,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 25 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2374 ImplicationChecksByTransitivity, 4217.7ms TimeCoverageRelationStatistics Valid=382, Invalid=12728, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 11:12:31,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-06 11:12:31,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-06 11:12:31,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:31,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-05-06 11:12:31,691 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2021-05-06 11:12:31,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:31,691 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-05-06 11:12:31,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 58 states have (on average 1.4137931034482758) internal successors, (82), 57 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:31,691 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-05-06 11:12:31,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:12:31,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:31,692 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:31,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable234 [2021-05-06 11:12:31,692 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:31,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:31,692 INFO L82 PathProgramCache]: Analyzing trace with hash -615849368, now seen corresponding path program 47 times [2021-05-06 11:12:31,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:31,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718753621] [2021-05-06 11:12:31,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:31,698 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:31,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:31,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:31,720 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:31,726 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 11:12:31,729 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:31,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,730 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:31,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:31,765 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:31,782 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:31,783 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:31,785 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:31,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:31,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:31,824 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:31,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:31,845 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:31,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:31,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:31,856 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:31,866 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:31,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:31,874 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:31,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:31,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:31,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:31,935 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 11:12:31,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:33,680 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:33,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718753621] [2021-05-06 11:12:33,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [718753621] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:33,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:33,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:12:33,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271011616] [2021-05-06 11:12:33,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:12:33,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:33,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:12:33,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=3758, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:12:33,682 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 60 states, 59 states have (on average 1.4406779661016949) internal successors, (85), 58 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:37,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:37,919 INFO L93 Difference]: Finished difference Result 101 states and 105 transitions. [2021-05-06 11:12:37,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:12:37,920 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.4406779661016949) internal successors, (85), 58 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 11:12:37,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:37,920 INFO L225 Difference]: With dead ends: 101 [2021-05-06 11:12:37,920 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:12:37,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2435 ImplicationChecksByTransitivity, 4297.2ms TimeCoverageRelationStatistics Valid=388, Invalid=13184, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:12:37,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:12:37,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-06 11:12:37,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:37,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-06 11:12:37,931 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 89 [2021-05-06 11:12:37,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:37,931 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-06 11:12:37,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 59 states have (on average 1.4406779661016949) internal successors, (85), 58 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:37,931 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-06 11:12:37,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:12:37,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:37,932 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:37,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable239 [2021-05-06 11:12:37,932 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:37,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:37,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1159157994, now seen corresponding path program 48 times [2021-05-06 11:12:37,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:37,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223438066] [2021-05-06 11:12:37,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:37,938 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:37,939 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:37,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:37,947 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:37,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:37,959 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:37,965 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 11:12:37,968 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:37,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:37,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:37,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:37,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:38,005 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:38,021 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:38,022 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:38,029 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:38,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:38,031 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:38,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:38,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:38,068 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:38,085 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:38,089 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:38,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:38,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:38,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:38,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:38,112 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:38,119 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:38,119 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:38,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:38,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:38,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:38,175 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 11:12:38,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:40,449 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:40,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223438066] [2021-05-06 11:12:40,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1223438066] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:40,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:40,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:12:40,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863408489] [2021-05-06 11:12:40,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:12:40,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:40,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:12:40,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3857, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:12:40,451 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 61 states, 60 states have (on average 1.4166666666666667) internal successors, (85), 59 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:44,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:44,685 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2021-05-06 11:12:44,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 11:12:44,685 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.4166666666666667) internal successors, (85), 59 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 11:12:44,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:44,686 INFO L225 Difference]: With dead ends: 99 [2021-05-06 11:12:44,686 INFO L226 Difference]: Without dead ends: 94 [2021-05-06 11:12:44,686 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 22 SyntacticMatches, 7 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3444 ImplicationChecksByTransitivity, 4649.6ms TimeCoverageRelationStatistics Valid=443, Invalid=13599, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:12:44,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-06 11:12:44,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-06 11:12:44,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:44,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-06 11:12:44,696 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-06 11:12:44,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:44,696 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-06 11:12:44,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 60 states have (on average 1.4166666666666667) internal successors, (85), 59 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:44,697 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-06 11:12:44,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 11:12:44,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:44,697 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:44,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable244 [2021-05-06 11:12:44,697 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:44,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:44,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1806816469, now seen corresponding path program 49 times [2021-05-06 11:12:44,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:44,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1425237762] [2021-05-06 11:12:44,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:44,703 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:44,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,715 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:44,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:44,725 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:44,732 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 11:12:44,735 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:44,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:44,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:44,771 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:44,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:44,788 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:44,790 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:44,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,802 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:44,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:44,826 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:44,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:44,845 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:44,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:44,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:44,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:44,871 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:44,877 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 11:12:44,878 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:44,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:44,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:44,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:44,933 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 11:12:44,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:46,804 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:46,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1425237762] [2021-05-06 11:12:46,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1425237762] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:46,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:46,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:12:46,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781300451] [2021-05-06 11:12:46,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:12:46,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:46,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:12:46,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=3982, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:12:46,805 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 62 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 60 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:50,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:50,848 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2021-05-06 11:12:50,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:12:50,849 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 60 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-06 11:12:50,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:50,849 INFO L225 Difference]: With dead ends: 104 [2021-05-06 11:12:50,849 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:12:50,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 24 SyntacticMatches, 6 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3545 ImplicationChecksByTransitivity, 4164.1ms TimeCoverageRelationStatistics Valid=451, Invalid=14069, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 11:12:50,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:12:50,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2021-05-06 11:12:50,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:50,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-05-06 11:12:50,860 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 92 [2021-05-06 11:12:50,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:50,860 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-05-06 11:12:50,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 60 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:50,860 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-05-06 11:12:50,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 11:12:50,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:50,861 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:50,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable249 [2021-05-06 11:12:50,861 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:50,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:50,861 INFO L82 PathProgramCache]: Analyzing trace with hash -31809107, now seen corresponding path program 50 times [2021-05-06 11:12:50,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:50,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565275751] [2021-05-06 11:12:50,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:50,867 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:50,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:50,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:50,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:50,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:50,889 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:50,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:50,898 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:50,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:50,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:50,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:50,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:50,934 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:50,950 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:50,951 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:50,954 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:50,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:50,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:50,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:50,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:50,989 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:51,006 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:51,009 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:51,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:51,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:51,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:51,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:51,031 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:51,038 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 11:12:51,039 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:51,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:51,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:51,115 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 11:12:51,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:53,184 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:53,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565275751] [2021-05-06 11:12:53,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [565275751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:53,184 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:53,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:12:53,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665892181] [2021-05-06 11:12:53,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:12:53,184 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:53,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:12:53,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=4136, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:12:53,185 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 63 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 61 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:57,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:57,785 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2021-05-06 11:12:57,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:12:57,786 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 61 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-06 11:12:57,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:57,786 INFO L225 Difference]: With dead ends: 102 [2021-05-06 11:12:57,786 INFO L226 Difference]: Without dead ends: 97 [2021-05-06 11:12:57,787 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 25 SyntacticMatches, 5 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2692 ImplicationChecksByTransitivity, 4793.8ms TimeCoverageRelationStatistics Valid=406, Invalid=14600, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 11:12:57,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-06 11:12:57,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-05-06 11:12:57,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.032967032967033) internal successors, (94), 91 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:57,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2021-05-06 11:12:57,798 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 92 [2021-05-06 11:12:57,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:57,798 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2021-05-06 11:12:57,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 61 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:57,798 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2021-05-06 11:12:57,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:12:57,798 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:57,798 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:57,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable254 [2021-05-06 11:12:57,798 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:57,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:57,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1182890104, now seen corresponding path program 51 times [2021-05-06 11:12:57,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:57,799 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487310642] [2021-05-06 11:12:57,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:57,805 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:12:57,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:57,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:57,825 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:12:57,832 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 11:12:57,834 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:12:57,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:12:57,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:12:57,870 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:12:57,887 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:57,888 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:57,890 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:12:57,891 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:57,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:57,926 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:12:57,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:57,945 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:12:57,946 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:57,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:57,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:57,966 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:12:57,972 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:57,972 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:57,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:58,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:58,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:58,033 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 11:12:58,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:58,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:00,057 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:00,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487310642] [2021-05-06 11:13:00,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [487310642] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:00,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:00,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:13:00,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666760706] [2021-05-06 11:13:00,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:13:00,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:00,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:13:00,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=4266, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:13:00,058 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand has 64 states, 63 states have (on average 1.4444444444444444) internal successors, (91), 62 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:04,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:04,197 INFO L93 Difference]: Finished difference Result 107 states and 111 transitions. [2021-05-06 11:13:04,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:13:04,197 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 1.4444444444444444) internal successors, (91), 62 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:13:04,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:04,198 INFO L225 Difference]: With dead ends: 107 [2021-05-06 11:13:04,198 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 11:13:04,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2749 ImplicationChecksByTransitivity, 4433.5ms TimeCoverageRelationStatistics Valid=412, Invalid=15088, Unknown=0, NotChecked=0, Total=15500 [2021-05-06 11:13:04,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 11:13:04,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2021-05-06 11:13:04,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:04,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-05-06 11:13:04,222 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 95 [2021-05-06 11:13:04,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:04,222 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-05-06 11:13:04,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 63 states have (on average 1.4444444444444444) internal successors, (91), 62 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:04,222 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-05-06 11:13:04,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:13:04,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:04,223 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:04,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable259 [2021-05-06 11:13:04,236 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:04,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:04,237 INFO L82 PathProgramCache]: Analyzing trace with hash 592117258, now seen corresponding path program 52 times [2021-05-06 11:13:04,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:04,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658828239] [2021-05-06 11:13:04,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:04,249 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:04,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:04,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:04,273 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:04,279 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 11:13:04,282 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:04,283 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,292 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:04,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:04,321 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:04,338 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:04,340 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:04,343 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:04,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:04,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:04,382 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:04,399 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:04,402 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:04,403 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:04,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:04,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:04,423 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:04,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:04,430 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:04,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:04,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:04,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:04,525 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 11:13:04,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:06,615 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:06,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658828239] [2021-05-06 11:13:06,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1658828239] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:06,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:06,616 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:13:06,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778675146] [2021-05-06 11:13:06,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:13:06,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:06,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:13:06,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=4371, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:13:06,617 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 65 states, 64 states have (on average 1.421875) internal successors, (91), 63 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:11,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:11,196 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2021-05-06 11:13:11,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:13:11,196 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.421875) internal successors, (91), 63 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:13:11,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:11,209 INFO L225 Difference]: With dead ends: 105 [2021-05-06 11:13:11,209 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 11:13:11,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 24 SyntacticMatches, 7 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3899 ImplicationChecksByTransitivity, 4673.0ms TimeCoverageRelationStatistics Valid=471, Invalid=15531, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 11:13:11,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 11:13:11,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-05-06 11:13:11,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:11,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-06 11:13:11,237 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2021-05-06 11:13:11,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:11,237 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-06 11:13:11,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 64 states have (on average 1.421875) internal successors, (91), 63 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:11,237 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-06 11:13:11,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:13:11,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:11,238 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:11,238 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable264 [2021-05-06 11:13:11,238 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:11,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:11,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1883959819, now seen corresponding path program 53 times [2021-05-06 11:13:11,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:11,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831438169] [2021-05-06 11:13:11,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:11,258 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:11,259 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,269 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:11,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:11,280 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:11,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:11,289 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:11,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:11,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:11,326 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:11,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:11,344 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:11,346 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:11,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:11,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:11,386 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:11,404 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:11,408 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:11,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:11,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:11,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:11,427 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:11,434 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 11:13:11,435 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:11,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:11,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:11,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:11,503 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 11:13:11,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:11,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:13,357 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:13,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831438169] [2021-05-06 11:13:13,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [831438169] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:13,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:13,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:13:13,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575484659] [2021-05-06 11:13:13,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:13:13,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:13,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:13:13,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=4504, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:13:13,359 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 66 states, 65 states have (on average 1.4461538461538461) internal successors, (94), 64 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:17,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:17,874 INFO L93 Difference]: Finished difference Result 110 states and 114 transitions. [2021-05-06 11:13:17,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:13:17,874 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.4461538461538461) internal successors, (94), 64 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 11:13:17,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:17,875 INFO L225 Difference]: With dead ends: 110 [2021-05-06 11:13:17,875 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 11:13:17,875 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3960 ImplicationChecksByTransitivity, 4364.8ms TimeCoverageRelationStatistics Valid=479, Invalid=16033, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 11:13:17,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 11:13:17,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2021-05-06 11:13:17,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0315789473684212) internal successors, (98), 95 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:17,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-05-06 11:13:17,886 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 98 [2021-05-06 11:13:17,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:17,886 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-05-06 11:13:17,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 1.4461538461538461) internal successors, (94), 64 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:17,887 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-05-06 11:13:17,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:13:17,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:17,887 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:17,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable269 [2021-05-06 11:13:17,887 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:17,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:17,887 INFO L82 PathProgramCache]: Analyzing trace with hash -636000115, now seen corresponding path program 54 times [2021-05-06 11:13:17,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:17,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267907119] [2021-05-06 11:13:17,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:17,894 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:17,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:17,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:17,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:17,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:17,915 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:17,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:17,924 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:17,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:17,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:17,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:17,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:17,962 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:17,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:17,980 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:17,982 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:17,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:17,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:18,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:18,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:18,021 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:18,039 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:18,043 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:18,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:18,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:18,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:18,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:18,066 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:18,072 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:18,073 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:18,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:18,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:18,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:18,136 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 11:13:18,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:20,274 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:20,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267907119] [2021-05-06 11:13:20,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [267907119] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:20,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:20,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:13:20,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368821533] [2021-05-06 11:13:20,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:13:20,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:20,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:13:20,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=4640, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:13:20,276 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 67 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 65 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:25,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:25,029 INFO L93 Difference]: Finished difference Result 108 states and 110 transitions. [2021-05-06 11:13:25,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 11:13:25,030 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 65 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 11:13:25,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:25,030 INFO L225 Difference]: With dead ends: 108 [2021-05-06 11:13:25,030 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 11:13:25,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4116 ImplicationChecksByTransitivity, 4798.2ms TimeCoverageRelationStatistics Valid=485, Invalid=16545, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 11:13:25,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 11:13:25,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2021-05-06 11:13:25,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 97 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:25,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2021-05-06 11:13:25,042 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 98 [2021-05-06 11:13:25,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:25,042 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2021-05-06 11:13:25,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 65 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2021-05-06 11:13:25,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:13:25,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:25,043 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:25,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable274 [2021-05-06 11:13:25,043 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:25,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:25,043 INFO L82 PathProgramCache]: Analyzing trace with hash -429271896, now seen corresponding path program 55 times [2021-05-06 11:13:25,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:25,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193460176] [2021-05-06 11:13:25,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:25,049 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:25,050 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,059 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:25,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:25,070 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:25,076 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:25,079 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:25,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,101 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:25,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:25,116 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:25,132 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:25,133 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:25,136 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:25,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:25,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:25,173 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:25,190 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:25,193 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:25,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:25,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:25,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:25,217 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:25,224 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:25,224 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:25,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:25,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:25,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:25,278 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 11:13:25,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:27,402 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:27,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193460176] [2021-05-06 11:13:27,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1193460176] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:27,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:27,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:13:27,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710990257] [2021-05-06 11:13:27,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:13:27,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:27,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:13:27,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=4777, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:13:27,404 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand has 68 states, 67 states have (on average 1.4477611940298507) internal successors, (97), 66 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:32,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:32,321 INFO L93 Difference]: Finished difference Result 113 states and 117 transitions. [2021-05-06 11:13:32,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:13:32,321 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.4477611940298507) internal successors, (97), 66 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:13:32,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:32,321 INFO L225 Difference]: With dead ends: 113 [2021-05-06 11:13:32,322 INFO L226 Difference]: Without dead ends: 105 [2021-05-06 11:13:32,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 28 SyntacticMatches, 5 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4236 ImplicationChecksByTransitivity, 4852.5ms TimeCoverageRelationStatistics Valid=493, Invalid=17063, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 11:13:32,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-06 11:13:32,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-05-06 11:13:32,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:32,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-06 11:13:32,333 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 101 [2021-05-06 11:13:32,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:32,334 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-06 11:13:32,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 67 states have (on average 1.4477611940298507) internal successors, (97), 66 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:32,334 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-06 11:13:32,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:13:32,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:32,334 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:32,334 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable279 [2021-05-06 11:13:32,334 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:32,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:32,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1345735466, now seen corresponding path program 56 times [2021-05-06 11:13:32,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:32,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716852014] [2021-05-06 11:13:32,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:32,340 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:32,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:32,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:32,360 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:32,367 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:32,369 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:32,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:32,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:32,406 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:32,422 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:32,423 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:32,426 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:32,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:32,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:32,463 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:32,481 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:32,484 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:32,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:32,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:32,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:32,506 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:32,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:32,514 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:32,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:32,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:32,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:32,567 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 11:13:32,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:34,658 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:34,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716852014] [2021-05-06 11:13:34,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [716852014] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:34,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:34,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 11:13:34,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640261037] [2021-05-06 11:13:34,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 11:13:34,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:34,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 11:13:34,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=4917, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:13:34,660 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 69 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 67 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:39,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:39,806 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-06 11:13:39,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:13:39,807 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 67 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:13:39,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:39,807 INFO L225 Difference]: With dead ends: 111 [2021-05-06 11:13:39,807 INFO L226 Difference]: Without dead ends: 106 [2021-05-06 11:13:39,808 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4328 ImplicationChecksByTransitivity, 4944.8ms TimeCoverageRelationStatistics Valid=499, Invalid=17591, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 11:13:39,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-06 11:13:39,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-05-06 11:13:39,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:39,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-05-06 11:13:39,830 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2021-05-06 11:13:39,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:39,830 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-05-06 11:13:39,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 67 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:39,831 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-05-06 11:13:39,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:13:39,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:39,831 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:39,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable284 [2021-05-06 11:13:39,831 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:39,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:39,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1165029141, now seen corresponding path program 57 times [2021-05-06 11:13:39,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:39,832 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65364495] [2021-05-06 11:13:39,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:39,838 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:39,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:39,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:39,860 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:39,867 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:39,870 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:39,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:39,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:39,908 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:39,925 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:39,926 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:39,928 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:39,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:39,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:39,965 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:39,982 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:39,985 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:39,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:39,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:40,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:40,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:40,012 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:40,020 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:40,021 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:40,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:40,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:40,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:40,083 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 11:13:40,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:42,321 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:42,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65364495] [2021-05-06 11:13:42,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [65364495] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:42,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:42,322 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 11:13:42,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069112710] [2021-05-06 11:13:42,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 11:13:42,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:42,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 11:13:42,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=5058, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:13:42,323 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 70 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 68 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:47,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:47,424 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2021-05-06 11:13:47,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:13:47,424 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 68 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 11:13:47,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:47,425 INFO L225 Difference]: With dead ends: 116 [2021-05-06 11:13:47,425 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 11:13:47,425 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4449 ImplicationChecksByTransitivity, 5057.8ms TimeCoverageRelationStatistics Valid=507, Invalid=18125, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 11:13:47,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 11:13:47,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-05-06 11:13:47,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:47,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-06 11:13:47,437 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 104 [2021-05-06 11:13:47,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:47,437 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-06 11:13:47,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 68 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:47,438 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-06 11:13:47,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:13:47,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:47,438 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:47,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable289 [2021-05-06 11:13:47,438 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:47,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:47,438 INFO L82 PathProgramCache]: Analyzing trace with hash 609978221, now seen corresponding path program 58 times [2021-05-06 11:13:47,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:47,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441830891] [2021-05-06 11:13:47,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:47,445 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:47,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:47,456 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:47,465 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:47,471 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:47,474 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:47,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:47,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:47,511 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:47,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:47,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:47,532 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:47,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:47,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:47,566 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:47,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:47,586 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:47,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:47,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:47,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:47,609 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:47,615 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 11:13:47,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:47,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:47,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:47,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:47,672 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 11:13:47,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:50,099 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:50,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441830891] [2021-05-06 11:13:50,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [441830891] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:50,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:50,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 11:13:50,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343045717] [2021-05-06 11:13:50,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 11:13:50,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:50,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 11:13:50,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=5068, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:13:50,101 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 71 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 69 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:55,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:55,484 INFO L93 Difference]: Finished difference Result 114 states and 116 transitions. [2021-05-06 11:13:55,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 11:13:55,484 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 69 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 11:13:55,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:55,485 INFO L225 Difference]: With dead ends: 114 [2021-05-06 11:13:55,485 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 11:13:55,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4332 ImplicationChecksByTransitivity, 5412.8ms TimeCoverageRelationStatistics Valid=494, Invalid=18412, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 11:13:55,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 11:13:55,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2021-05-06 11:13:55,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.029126213592233) internal successors, (106), 103 states have internal predecessors, (106), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:55,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2021-05-06 11:13:55,498 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2021-05-06 11:13:55,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:55,498 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2021-05-06 11:13:55,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 69 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:55,498 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2021-05-06 11:13:55,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:13:55,499 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:55,499 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 30, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:55,499 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable294 [2021-05-06 11:13:55,499 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:55,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:55,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1403963848, now seen corresponding path program 59 times [2021-05-06 11:13:55,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:55,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920941778] [2021-05-06 11:13:55,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:55,506 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:13:55,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:55,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:55,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:13:55,533 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 11:13:55,537 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:13:55,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:13:55,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:13:55,573 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:13:55,589 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:55,589 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:55,592 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:13:55,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:55,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:55,626 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:13:55,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:55,647 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:13:55,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:55,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:55,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:55,669 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:13:55,675 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 11:13:55,676 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:55,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:55,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:55,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:55,738 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 11:13:55,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:55,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:58,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:58,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920941778] [2021-05-06 11:13:58,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1920941778] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:58,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:58,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:13:58,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401619067] [2021-05-06 11:13:58,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:13:58,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:58,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:13:58,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=5378, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:13:58,468 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 72 states, 71 states have (on average 1.4507042253521127) internal successors, (103), 70 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:04,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:04,203 INFO L93 Difference]: Finished difference Result 119 states and 123 transitions. [2021-05-06 11:14:04,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:14:04,204 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.4507042253521127) internal successors, (103), 70 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 11:14:04,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:04,204 INFO L225 Difference]: With dead ends: 119 [2021-05-06 11:14:04,204 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 11:14:04,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3423 ImplicationChecksByTransitivity, 6087.2ms TimeCoverageRelationStatistics Valid=460, Invalid=19280, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 11:14:04,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 11:14:04,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2021-05-06 11:14:04,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:04,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-06 11:14:04,218 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 107 [2021-05-06 11:14:04,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:04,218 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-06 11:14:04,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 71 states have (on average 1.4507042253521127) internal successors, (103), 70 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:04,218 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-06 11:14:04,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:14:04,219 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:04,219 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:04,219 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable299 [2021-05-06 11:14:04,219 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:04,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:04,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1115996086, now seen corresponding path program 60 times [2021-05-06 11:14:04,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:04,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660035596] [2021-05-06 11:14:04,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:04,226 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:04,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:04,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:04,248 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:04,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:04,257 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:04,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:04,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:04,293 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:04,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:04,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:04,313 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:04,324 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:04,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:04,388 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:04,404 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:04,407 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:04,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,432 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:04,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:04,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:04,444 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:04,451 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 11:14:04,464 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:04,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:04,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:04,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:04,577 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 11:14:04,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:07,235 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:07,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660035596] [2021-05-06 11:14:07,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1660035596] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:07,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:07,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:14:07,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415896982] [2021-05-06 11:14:07,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:14:07,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:07,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:14:07,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=5526, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:14:07,236 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 73 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 71 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:13,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:13,069 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-06 11:14:13,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 11:14:13,070 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 71 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 11:14:13,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:13,070 INFO L225 Difference]: With dead ends: 117 [2021-05-06 11:14:13,071 INFO L226 Difference]: Without dead ends: 112 [2021-05-06 11:14:13,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 31 SyntacticMatches, 4 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3497 ImplicationChecksByTransitivity, 6085.1ms TimeCoverageRelationStatistics Valid=466, Invalid=19840, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 11:14:13,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-06 11:14:13,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-05-06 11:14:13,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:13,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-06 11:14:13,100 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-06 11:14:13,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:13,100 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-06 11:14:13,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 71 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:13,100 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-06 11:14:13,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:14:13,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:13,100 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:13,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable304 [2021-05-06 11:14:13,100 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:13,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:13,101 INFO L82 PathProgramCache]: Analyzing trace with hash -2043115573, now seen corresponding path program 61 times [2021-05-06 11:14:13,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:13,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816317740] [2021-05-06 11:14:13,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:13,107 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:13,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:13,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:13,125 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:13,131 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:13,134 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:13,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,154 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:13,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:13,169 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:13,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:13,187 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:13,189 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:13,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:13,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:13,225 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:13,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:13,246 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:13,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,247 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:13,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:13,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:13,274 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:13,280 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 11:14:13,281 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:13,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:13,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:13,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:13,378 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 11:14:13,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:13,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:15,964 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:15,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816317740] [2021-05-06 11:14:15,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1816317740] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:15,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:15,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 11:14:15,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946722534] [2021-05-06 11:14:15,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 11:14:15,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:15,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 11:14:15,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=5644, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:14:15,965 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 74 states, 73 states have (on average 1.452054794520548) internal successors, (106), 72 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:21,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:21,828 INFO L93 Difference]: Finished difference Result 122 states and 126 transitions. [2021-05-06 11:14:21,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:14:21,828 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.452054794520548) internal successors, (106), 72 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-05-06 11:14:21,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:21,829 INFO L225 Difference]: With dead ends: 122 [2021-05-06 11:14:21,829 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 11:14:21,830 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4970 ImplicationChecksByTransitivity, 5785.6ms TimeCoverageRelationStatistics Valid=535, Invalid=20345, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 11:14:21,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 11:14:21,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2021-05-06 11:14:21,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.02803738317757) internal successors, (110), 107 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:21,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2021-05-06 11:14:21,842 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 110 [2021-05-06 11:14:21,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:21,843 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2021-05-06 11:14:21,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 73 states have (on average 1.452054794520548) internal successors, (106), 72 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:21,843 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2021-05-06 11:14:21,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:14:21,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:21,843 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:21,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable309 [2021-05-06 11:14:21,843 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:21,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:21,843 INFO L82 PathProgramCache]: Analyzing trace with hash -268108211, now seen corresponding path program 62 times [2021-05-06 11:14:21,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:21,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489402993] [2021-05-06 11:14:21,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:21,850 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:21,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:21,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:21,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:21,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:21,884 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:21,890 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 11:14:21,894 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:21,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:21,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:21,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:21,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:21,935 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:21,955 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:21,956 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:21,958 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:21,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:21,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:21,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:21,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:22,000 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:22,020 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:22,025 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:22,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:22,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:22,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:22,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:22,054 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:22,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:22,063 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:22,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:22,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:22,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:22,122 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 11:14:22,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:24,626 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:24,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489402993] [2021-05-06 11:14:24,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [489402993] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:24,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:24,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:14:24,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217150795] [2021-05-06 11:14:24,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:14:24,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:24,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:14:24,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=5796, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:14:24,627 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand has 75 states, 74 states have (on average 1.4324324324324325) internal successors, (106), 73 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:30,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:30,551 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2021-05-06 11:14:30,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 11:14:30,551 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 1.4324324324324325) internal successors, (106), 73 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-05-06 11:14:30,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:30,551 INFO L225 Difference]: With dead ends: 120 [2021-05-06 11:14:30,551 INFO L226 Difference]: Without dead ends: 115 [2021-05-06 11:14:30,552 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5144 ImplicationChecksByTransitivity, 5765.2ms TimeCoverageRelationStatistics Valid=541, Invalid=20921, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 11:14:30,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-06 11:14:30,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2021-05-06 11:14:30,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.0275229357798166) internal successors, (112), 109 states have internal predecessors, (112), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:30,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 116 transitions. [2021-05-06 11:14:30,578 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 116 transitions. Word has length 110 [2021-05-06 11:14:30,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:30,578 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 116 transitions. [2021-05-06 11:14:30,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 74 states have (on average 1.4324324324324325) internal successors, (106), 73 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:30,578 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 116 transitions. [2021-05-06 11:14:30,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:14:30,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:30,578 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:30,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable314 [2021-05-06 11:14:30,578 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:30,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:30,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1318099224, now seen corresponding path program 63 times [2021-05-06 11:14:30,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:30,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741336549] [2021-05-06 11:14:30,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:30,585 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:30,596 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:30,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:30,606 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:30,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:30,616 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:30,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:30,642 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:30,652 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:30,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:30,670 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:30,672 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:30,673 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:30,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:30,709 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:30,726 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:30,729 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:30,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:30,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:30,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:30,751 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:30,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:30,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:30,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:30,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:30,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:30,812 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 11:14:30,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:30,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:33,514 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:33,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741336549] [2021-05-06 11:14:33,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [741336549] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:33,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:33,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:14:33,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635970985] [2021-05-06 11:14:33,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:14:33,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:33,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:14:33,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=5949, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:14:33,515 INFO L87 Difference]: Start difference. First operand 114 states and 116 transitions. Second operand has 76 states, 75 states have (on average 1.4533333333333334) internal successors, (109), 74 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:39,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:39,671 INFO L93 Difference]: Finished difference Result 125 states and 129 transitions. [2021-05-06 11:14:39,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:14:39,672 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.4533333333333334) internal successors, (109), 74 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-06 11:14:39,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:39,672 INFO L225 Difference]: With dead ends: 125 [2021-05-06 11:14:39,672 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 11:14:39,674 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5276 ImplicationChecksByTransitivity, 6054.4ms TimeCoverageRelationStatistics Valid=549, Invalid=21503, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 11:14:39,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 11:14:39,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-05-06 11:14:39,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:39,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-06 11:14:39,690 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 113 [2021-05-06 11:14:39,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:39,690 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-06 11:14:39,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 75 states have (on average 1.4533333333333334) internal successors, (109), 74 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:39,690 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-06 11:14:39,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:14:39,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:39,690 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:39,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable319 [2021-05-06 11:14:39,691 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:39,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:39,691 INFO L82 PathProgramCache]: Analyzing trace with hash 456908138, now seen corresponding path program 64 times [2021-05-06 11:14:39,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:39,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060971695] [2021-05-06 11:14:39,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:39,697 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:39,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:39,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:39,722 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:39,729 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 11:14:39,732 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:39,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:39,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:39,772 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:39,789 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:39,790 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:39,792 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:39,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:39,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:39,832 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:39,848 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:39,852 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:39,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:39,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:39,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:39,873 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:39,880 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 11:14:39,880 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:39,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:39,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:39,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:39,936 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 11:14:39,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:42,721 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:42,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1060971695] [2021-05-06 11:14:42,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1060971695] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:42,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:42,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 11:14:42,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651786675] [2021-05-06 11:14:42,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 11:14:42,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:42,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 11:14:42,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=5959, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:14:42,723 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 77 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 75 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:49,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:49,083 INFO L93 Difference]: Finished difference Result 123 states and 125 transitions. [2021-05-06 11:14:49,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 11:14:49,083 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 75 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-06 11:14:49,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:49,084 INFO L225 Difference]: With dead ends: 123 [2021-05-06 11:14:49,084 INFO L226 Difference]: Without dead ends: 118 [2021-05-06 11:14:49,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 31 SyntacticMatches, 7 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5133 ImplicationChecksByTransitivity, 6154.6ms TimeCoverageRelationStatistics Valid=536, Invalid=21814, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 11:14:49,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-06 11:14:49,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2021-05-06 11:14:49,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:49,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-06 11:14:49,099 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-06 11:14:49,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:49,099 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-06 11:14:49,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 75 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:49,099 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-06 11:14:49,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 11:14:49,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:49,099 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:49,099 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable324 [2021-05-06 11:14:49,099 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:49,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:49,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1746577749, now seen corresponding path program 65 times [2021-05-06 11:14:49,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:49,100 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99791594] [2021-05-06 11:14:49,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:49,106 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:49,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:49,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:49,127 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:49,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:49,136 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:49,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:49,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:49,172 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:49,189 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:49,190 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:49,192 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:49,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:49,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:49,229 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:49,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:49,249 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:49,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:49,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:49,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:49,274 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:49,280 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 11:14:49,281 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:49,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:49,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:49,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:49,335 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 11:14:49,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:49,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:52,272 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:52,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99791594] [2021-05-06 11:14:52,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [99791594] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:52,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:52,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 11:14:52,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217696815] [2021-05-06 11:14:52,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 11:14:52,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:52,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 11:14:52,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=6262, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:14:52,274 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 78 states, 77 states have (on average 1.4545454545454546) internal successors, (112), 76 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:58,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:58,707 INFO L93 Difference]: Finished difference Result 128 states and 132 transitions. [2021-05-06 11:14:58,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 11:14:58,707 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.4545454545454546) internal successors, (112), 76 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-06 11:14:58,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:58,708 INFO L225 Difference]: With dead ends: 128 [2021-05-06 11:14:58,708 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 11:14:58,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 31 SyntacticMatches, 7 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5577 ImplicationChecksByTransitivity, 6411.9ms TimeCoverageRelationStatistics Valid=563, Invalid=22693, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 11:14:58,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 11:14:58,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-05-06 11:14:58,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:58,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-06 11:14:58,723 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 116 [2021-05-06 11:14:58,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:58,723 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-06 11:14:58,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 77 states have (on average 1.4545454545454546) internal successors, (112), 76 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:58,723 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-06 11:14:58,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 11:14:58,724 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:58,724 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:58,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable329 [2021-05-06 11:14:58,724 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:58,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:58,724 INFO L82 PathProgramCache]: Analyzing trace with hash 28429613, now seen corresponding path program 66 times [2021-05-06 11:14:58,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:58,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [651007106] [2021-05-06 11:14:58,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:58,735 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:14:58,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:58,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:58,758 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:14:58,765 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 11:14:58,767 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:14:58,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:14:58,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:14:58,803 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:14:58,819 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,821 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:58,823 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:14:58,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,825 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:58,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:58,860 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:14:58,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,882 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:14:58,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:58,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:58,903 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:14:58,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,910 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:58,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:58,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:58,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:58,966 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 11:14:58,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:02,099 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:02,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [651007106] [2021-05-06 11:15:02,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [651007106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:02,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:02,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:15:02,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145098914] [2021-05-06 11:15:02,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:15:02,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:02,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:15:02,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=6422, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:15:02,101 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 79 states, 78 states have (on average 1.435897435897436) internal successors, (112), 77 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:09,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:09,015 INFO L93 Difference]: Finished difference Result 126 states and 128 transitions. [2021-05-06 11:15:09,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:15:09,015 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 1.435897435897436) internal successors, (112), 77 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-06 11:15:09,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:09,016 INFO L225 Difference]: With dead ends: 126 [2021-05-06 11:15:09,016 INFO L226 Difference]: Without dead ends: 121 [2021-05-06 11:15:09,017 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 29 SyntacticMatches, 9 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5747 ImplicationChecksByTransitivity, 6866.3ms TimeCoverageRelationStatistics Valid=569, Invalid=23301, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:15:09,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-06 11:15:09,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2021-05-06 11:15:09,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 115 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:09,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2021-05-06 11:15:09,034 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 116 [2021-05-06 11:15:09,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:09,035 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2021-05-06 11:15:09,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 78 states have (on average 1.435897435897436) internal successors, (112), 77 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:09,035 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2021-05-06 11:15:09,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:15:09,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:09,035 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 34, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:09,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable334 [2021-05-06 11:15:09,035 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:09,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:09,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1907512312, now seen corresponding path program 67 times [2021-05-06 11:15:09,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:09,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621734461] [2021-05-06 11:15:09,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:09,042 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:15:09,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:09,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:09,070 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:15:09,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:09,081 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:15:09,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:15:09,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:15:09,122 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:15:09,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:09,144 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:09,147 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:15:09,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,163 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:09,181 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:09,196 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:15:09,216 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:09,221 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:15:09,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:09,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:09,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:09,250 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:15:09,258 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 11:15:09,259 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:09,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:09,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:09,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:09,337 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 11:15:09,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:09,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:12,858 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:12,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621734461] [2021-05-06 11:15:12,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [621734461] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:12,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:12,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 11:15:12,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652072577] [2021-05-06 11:15:12,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 11:15:12,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:12,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 11:15:12,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=6618, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:15:12,859 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand has 80 states, 79 states have (on average 1.4556962025316456) internal successors, (115), 78 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:20,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:20,727 INFO L93 Difference]: Finished difference Result 131 states and 135 transitions. [2021-05-06 11:15:20,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 11:15:20,727 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 1.4556962025316456) internal successors, (115), 78 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 11:15:20,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:20,728 INFO L225 Difference]: With dead ends: 131 [2021-05-06 11:15:20,728 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 11:15:20,729 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4129 ImplicationChecksByTransitivity, 8072.1ms TimeCoverageRelationStatistics Valid=508, Invalid=23984, Unknown=0, NotChecked=0, Total=24492 [2021-05-06 11:15:20,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 11:15:20,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 121. [2021-05-06 11:15:20,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:20,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-06 11:15:20,744 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 119 [2021-05-06 11:15:20,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:20,745 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-06 11:15:20,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 79 states have (on average 1.4556962025316456) internal successors, (115), 78 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:20,745 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-06 11:15:20,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:15:20,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:20,745 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:20,745 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable339 [2021-05-06 11:15:20,745 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:20,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:20,746 INFO L82 PathProgramCache]: Analyzing trace with hash -132504950, now seen corresponding path program 68 times [2021-05-06 11:15:20,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:20,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751822030] [2021-05-06 11:15:20,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:20,752 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:15:20,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:20,774 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:20,776 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:15:20,783 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:20,786 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:15:20,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:15:20,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:15:20,825 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:15:20,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:20,843 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:20,845 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:15:20,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:20,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:20,885 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:15:20,904 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:20,908 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:15:20,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:20,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:20,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:20,931 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:15:20,939 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 11:15:20,939 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:20,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:21,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:21,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:21,002 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 11:15:21,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:21,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:24,256 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:24,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751822030] [2021-05-06 11:15:24,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [751822030] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:24,257 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:24,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 11:15:24,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161402709] [2021-05-06 11:15:24,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 11:15:24,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:24,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 11:15:24,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=6747, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:15:24,257 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 81 states, 80 states have (on average 1.4375) internal successors, (115), 79 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:31,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:31,489 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2021-05-06 11:15:31,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 11:15:31,489 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 1.4375) internal successors, (115), 79 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 11:15:31,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:31,489 INFO L225 Difference]: With dead ends: 129 [2021-05-06 11:15:31,490 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 11:15:31,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 32 SyntacticMatches, 7 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6011 ImplicationChecksByTransitivity, 7173.0ms TimeCoverageRelationStatistics Valid=583, Invalid=24539, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 11:15:31,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 11:15:31,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2021-05-06 11:15:31,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:31,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-06 11:15:31,507 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 119 [2021-05-06 11:15:31,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:31,508 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-06 11:15:31,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 80 states have (on average 1.4375) internal successors, (115), 79 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:31,508 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-06 11:15:31,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 11:15:31,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:31,508 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:31,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable344 [2021-05-06 11:15:31,508 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:31,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:31,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1169390987, now seen corresponding path program 69 times [2021-05-06 11:15:31,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:31,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527401622] [2021-05-06 11:15:31,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:31,515 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:15:31,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,516 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:31,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:31,534 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:15:31,540 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:31,543 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:15:31,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:15:31,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:15:31,578 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:15:31,594 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:31,595 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:31,597 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:15:31,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:31,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:31,639 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:15:31,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:31,659 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:15:31,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:31,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:31,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:31,681 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:15:31,687 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 11:15:31,687 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:31,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:31,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:31,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:31,762 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 11:15:31,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:35,045 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:35,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527401622] [2021-05-06 11:15:35,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1527401622] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:35,046 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:35,046 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:15:35,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433036622] [2021-05-06 11:15:35,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:15:35,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:35,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:15:35,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=6948, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:15:35,047 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 82 states, 81 states have (on average 1.4567901234567902) internal successors, (118), 80 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:43,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:43,048 INFO L93 Difference]: Finished difference Result 134 states and 138 transitions. [2021-05-06 11:15:43,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:15:43,048 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 1.4567901234567902) internal successors, (118), 80 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-06 11:15:43,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:43,049 INFO L225 Difference]: With dead ends: 134 [2021-05-06 11:15:43,049 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 11:15:43,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4328 ImplicationChecksByTransitivity, 7943.5ms TimeCoverageRelationStatistics Valid=520, Invalid=25240, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:15:43,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 11:15:43,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2021-05-06 11:15:43,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:43,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-06 11:15:43,072 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 122 [2021-05-06 11:15:43,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:43,074 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-06 11:15:43,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 81 states have (on average 1.4567901234567902) internal successors, (118), 80 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:43,074 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-06 11:15:43,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 11:15:43,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:43,088 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:43,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable349 [2021-05-06 11:15:43,088 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:43,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:43,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1350568947, now seen corresponding path program 70 times [2021-05-06 11:15:43,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:43,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794912430] [2021-05-06 11:15:43,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:43,094 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:15:43,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:43,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:43,118 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:15:43,125 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:43,128 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:15:43,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:15:43,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:15:43,167 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:15:43,184 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:43,185 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:43,187 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:15:43,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:43,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:43,224 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:15:43,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:43,245 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:15:43,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,259 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:43,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:43,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:43,269 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:15:43,276 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:43,276 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:43,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:43,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:43,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:43,374 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 11:15:43,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:47,136 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:47,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794912430] [2021-05-06 11:15:47,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1794912430] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:47,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:47,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 11:15:47,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350991886] [2021-05-06 11:15:47,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 11:15:47,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:47,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 11:15:47,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=7116, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:15:47,138 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 83 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 81 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:55,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:55,539 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-05-06 11:15:55,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 11:15:55,539 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 81 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-06 11:15:55,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:55,540 INFO L225 Difference]: With dead ends: 132 [2021-05-06 11:15:55,540 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 11:15:55,541 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 8658.0ms TimeCoverageRelationStatistics Valid=526, Invalid=25880, Unknown=0, NotChecked=0, Total=26406 [2021-05-06 11:15:55,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 11:15:55,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-05-06 11:15:55,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.024793388429752) internal successors, (124), 121 states have internal predecessors, (124), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:55,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 128 transitions. [2021-05-06 11:15:55,557 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 128 transitions. Word has length 122 [2021-05-06 11:15:55,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:55,557 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 128 transitions. [2021-05-06 11:15:55,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 81 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:55,557 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 128 transitions. [2021-05-06 11:15:55,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:15:55,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:55,558 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 36, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:55,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable354 [2021-05-06 11:15:55,558 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:55,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:55,558 INFO L82 PathProgramCache]: Analyzing trace with hash 2003540264, now seen corresponding path program 71 times [2021-05-06 11:15:55,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:55,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932198258] [2021-05-06 11:15:55,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:55,566 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:15:55,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:55,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:55,590 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:15:55,597 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:55,600 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:15:55,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:15:55,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:15:55,648 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:15:55,666 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:55,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:55,670 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:15:55,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:55,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:55,721 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:15:55,742 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:55,750 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:15:55,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:55,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:55,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:55,775 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:15:55,782 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 11:15:55,783 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:55,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:55,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:55,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:55,870 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 11:15:55,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:55,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:59,270 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:59,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932198258] [2021-05-06 11:15:59,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1932198258] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:59,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:59,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:15:59,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372701392] [2021-05-06 11:15:59,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:15:59,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:59,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:15:59,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=7249, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:15:59,271 INFO L87 Difference]: Start difference. First operand 126 states and 128 transitions. Second operand has 84 states, 83 states have (on average 1.4578313253012047) internal successors, (121), 82 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:06,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:06,705 INFO L93 Difference]: Finished difference Result 137 states and 141 transitions. [2021-05-06 11:16:06,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:16:06,705 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 1.4578313253012047) internal successors, (121), 82 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-06 11:16:06,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:06,706 INFO L225 Difference]: With dead ends: 137 [2021-05-06 11:16:06,706 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 11:16:06,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 34 SyntacticMatches, 7 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6446 ImplicationChecksByTransitivity, 7362.8ms TimeCoverageRelationStatistics Valid=605, Invalid=26455, Unknown=0, NotChecked=0, Total=27060 [2021-05-06 11:16:06,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 11:16:06,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2021-05-06 11:16:06,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:06,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-06 11:16:06,724 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 125 [2021-05-06 11:16:06,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:06,724 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-06 11:16:06,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 83 states have (on average 1.4578313253012047) internal successors, (121), 82 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:06,724 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-06 11:16:06,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:16:06,724 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:06,724 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:06,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable359 [2021-05-06 11:16:06,725 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:06,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:06,725 INFO L82 PathProgramCache]: Analyzing trace with hash -516419670, now seen corresponding path program 72 times [2021-05-06 11:16:06,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:06,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714005118] [2021-05-06 11:16:06,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:06,731 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:16:06,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:06,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:06,751 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:16:06,759 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:06,763 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:16:06,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:16:06,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:16:06,803 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:16:06,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:06,821 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:06,823 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:16:06,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:06,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:06,860 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:16:06,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:06,884 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:16:06,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:06,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:06,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:06,908 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:16:06,914 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 11:16:06,915 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:06,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:06,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:06,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:06,999 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 11:16:07,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:10,508 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:10,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714005118] [2021-05-06 11:16:10,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1714005118] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:10,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:10,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 11:16:10,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037105097] [2021-05-06 11:16:10,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 11:16:10,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:10,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 11:16:10,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=7421, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:16:10,510 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 85 states, 84 states have (on average 1.4404761904761905) internal successors, (121), 83 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:17,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:17,861 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-06 11:16:17,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 11:16:17,862 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.4404761904761905) internal successors, (121), 83 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-06 11:16:17,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:17,862 INFO L225 Difference]: With dead ends: 135 [2021-05-06 11:16:17,862 INFO L226 Difference]: Without dead ends: 130 [2021-05-06 11:16:17,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 34 SyntacticMatches, 7 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6608 ImplicationChecksByTransitivity, 7484.5ms TimeCoverageRelationStatistics Valid=611, Invalid=27111, Unknown=0, NotChecked=0, Total=27722 [2021-05-06 11:16:17,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-06 11:16:17,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2021-05-06 11:16:17,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:17,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2021-05-06 11:16:17,886 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 125 [2021-05-06 11:16:17,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:17,886 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2021-05-06 11:16:17,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 84 states have (on average 1.4404761904761905) internal successors, (121), 83 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:17,886 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2021-05-06 11:16:17,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:16:17,886 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:17,886 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 37, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:17,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable364 [2021-05-06 11:16:17,887 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:17,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:17,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1463876715, now seen corresponding path program 73 times [2021-05-06 11:16:17,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:17,887 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431622474] [2021-05-06 11:16:17,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:17,893 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:16:17,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:17,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:17,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:17,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:17,917 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:16:17,923 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:17,926 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:16:17,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:17,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:17,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:16:17,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:16:17,983 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:16:17,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:18,000 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:18,003 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:16:18,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:18,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:18,013 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:18,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:18,037 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:16:18,053 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:18,056 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:16:18,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:18,058 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:18,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:18,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:18,077 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:16:18,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:18,085 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:18,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:18,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:18,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:18,179 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 11:16:18,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:21,009 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:21,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431622474] [2021-05-06 11:16:21,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1431622474] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:21,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:21,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-06 11:16:21,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473032059] [2021-05-06 11:16:21,010 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-06 11:16:21,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:21,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-06 11:16:21,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=7594, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:16:21,011 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 86 states, 85 states have (on average 1.4588235294117646) internal successors, (124), 84 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:28,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:28,546 INFO L93 Difference]: Finished difference Result 140 states and 144 transitions. [2021-05-06 11:16:28,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 11:16:28,546 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.4588235294117646) internal successors, (124), 84 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-06 11:16:28,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:28,547 INFO L225 Difference]: With dead ends: 140 [2021-05-06 11:16:28,547 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 11:16:28,548 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6719 ImplicationChecksByTransitivity, 6872.5ms TimeCoverageRelationStatistics Valid=619, Invalid=27773, Unknown=0, NotChecked=0, Total=28392 [2021-05-06 11:16:28,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 11:16:28,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2021-05-06 11:16:28,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:28,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2021-05-06 11:16:28,598 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 128 [2021-05-06 11:16:28,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:28,598 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2021-05-06 11:16:28,598 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 85 states have (on average 1.4588235294117646) internal successors, (124), 84 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:28,598 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2021-05-06 11:16:28,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:16:28,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:28,599 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:28,599 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable369 [2021-05-06 11:16:28,599 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:28,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:28,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1056083219, now seen corresponding path program 74 times [2021-05-06 11:16:28,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:28,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648830421] [2021-05-06 11:16:28,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:28,605 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:16:28,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:28,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:28,626 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:16:28,633 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:28,635 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:16:28,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:16:28,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:16:28,678 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:16:28,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:28,698 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:28,701 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:16:28,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:28,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:28,744 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:16:28,761 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:28,764 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:16:28,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:28,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:28,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:28,788 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:16:28,794 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:28,794 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:28,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:28,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:28,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:28,855 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 11:16:28,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:32,221 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:32,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648830421] [2021-05-06 11:16:32,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [648830421] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:32,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:32,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 11:16:32,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836658442] [2021-05-06 11:16:32,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 11:16:32,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:32,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 11:16:32,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=7808, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:16:32,223 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 87 states, 86 states have (on average 1.441860465116279) internal successors, (124), 85 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:40,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:40,735 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2021-05-06 11:16:40,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 11:16:40,735 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 1.441860465116279) internal successors, (124), 85 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-06 11:16:40,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:40,735 INFO L225 Difference]: With dead ends: 138 [2021-05-06 11:16:40,736 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 11:16:40,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4808 ImplicationChecksByTransitivity, 8321.5ms TimeCoverageRelationStatistics Valid=550, Invalid=28520, Unknown=0, NotChecked=0, Total=29070 [2021-05-06 11:16:40,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 11:16:40,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2021-05-06 11:16:40,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.0236220472440944) internal successors, (130), 127 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:40,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2021-05-06 11:16:40,781 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 128 [2021-05-06 11:16:40,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:40,782 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2021-05-06 11:16:40,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 86 states have (on average 1.441860465116279) internal successors, (124), 85 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:40,782 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2021-05-06 11:16:40,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:16:40,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:40,782 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 38, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:40,782 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable374 [2021-05-06 11:16:40,782 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:40,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:40,783 INFO L82 PathProgramCache]: Analyzing trace with hash 409677384, now seen corresponding path program 75 times [2021-05-06 11:16:40,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:40,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797832395] [2021-05-06 11:16:40,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:40,789 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:16:40,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:40,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:40,812 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:16:40,818 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 11:16:40,821 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:16:40,843 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,844 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,853 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:16:40,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:16:40,869 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:16:40,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:40,887 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:40,890 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:16:40,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:40,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:40,926 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:16:40,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:40,945 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:16:40,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:40,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:40,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:40,969 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:16:40,975 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 11:16:40,976 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:40,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:41,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:41,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:41,028 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 11:16:41,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:44,517 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:44,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797832395] [2021-05-06 11:16:44,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [797832395] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:44,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:44,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 11:16:44,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224890074] [2021-05-06 11:16:44,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 11:16:44,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:44,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 11:16:44,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=7947, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:16:44,519 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 88 states, 87 states have (on average 1.4597701149425288) internal successors, (127), 86 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:52,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:52,453 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2021-05-06 11:16:52,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 11:16:52,454 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 1.4597701149425288) internal successors, (127), 86 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 11:16:52,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:52,454 INFO L225 Difference]: With dead ends: 143 [2021-05-06 11:16:52,454 INFO L226 Difference]: Without dead ends: 135 [2021-05-06 11:16:52,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7031 ImplicationChecksByTransitivity, 7706.3ms TimeCoverageRelationStatistics Valid=633, Invalid=29123, Unknown=0, NotChecked=0, Total=29756 [2021-05-06 11:16:52,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-06 11:16:52,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-05-06 11:16:52,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:52,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-06 11:16:52,473 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 131 [2021-05-06 11:16:52,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:52,473 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-06 11:16:52,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 87 states have (on average 1.4597701149425288) internal successors, (127), 86 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:52,474 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-06 11:16:52,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:16:52,474 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:52,474 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:52,474 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable379 [2021-05-06 11:16:52,474 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:52,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:52,475 INFO L82 PathProgramCache]: Analyzing trace with hash -2110282550, now seen corresponding path program 76 times [2021-05-06 11:16:52,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:52,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795722900] [2021-05-06 11:16:52,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:52,481 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:16:52,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:52,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:52,501 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:16:52,507 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 11:16:52,510 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:16:52,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:16:52,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:16:52,547 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:16:52,564 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:52,565 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:52,567 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:16:52,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:52,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:52,604 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:16:52,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:52,637 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:16:52,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:52,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:52,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:52,658 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:16:52,664 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 11:16:52,665 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:52,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:52,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:52,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:52,726 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 11:16:52,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:56,347 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:56,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795722900] [2021-05-06 11:16:56,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1795722900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:56,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:56,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 11:16:56,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681654817] [2021-05-06 11:16:56,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 11:16:56,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:56,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 11:16:56,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=8166, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:16:56,348 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 89 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 87 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:05,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:05,350 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-06 11:17:05,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-06 11:17:05,350 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 87 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 11:17:05,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:05,351 INFO L225 Difference]: With dead ends: 141 [2021-05-06 11:17:05,351 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 11:17:05,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5031 ImplicationChecksByTransitivity, 8804.0ms TimeCoverageRelationStatistics Valid=562, Invalid=29888, Unknown=0, NotChecked=0, Total=30450 [2021-05-06 11:17:05,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 11:17:05,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2021-05-06 11:17:05,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:05,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-06 11:17:05,372 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-06 11:17:05,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:05,372 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-06 11:17:05,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 87 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:05,373 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-06 11:17:05,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-06 11:17:05,373 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:05,373 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 39, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:05,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable384 [2021-05-06 11:17:05,373 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:05,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:05,373 INFO L82 PathProgramCache]: Analyzing trace with hash -441724085, now seen corresponding path program 77 times [2021-05-06 11:17:05,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:05,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524728884] [2021-05-06 11:17:05,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:05,380 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:17:05,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:05,392 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:05,404 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:17:05,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:05,416 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:17:05,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:17:05,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:17:05,461 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:17:05,478 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:05,480 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:05,482 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:17:05,494 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:05,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:05,521 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:17:05,537 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:05,541 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:17:05,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:05,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:05,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:05,571 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:17:05,578 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 11:17:05,579 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:05,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:05,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:05,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:05,676 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 11:17:05,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:09,779 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:09,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524728884] [2021-05-06 11:17:09,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1524728884] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:09,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:09,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 11:17:09,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947941813] [2021-05-06 11:17:09,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 11:17:09,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:09,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 11:17:09,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=8348, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:17:09,781 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 90 states, 89 states have (on average 1.4606741573033708) internal successors, (130), 88 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:18,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:18,878 INFO L93 Difference]: Finished difference Result 146 states and 150 transitions. [2021-05-06 11:17:18,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:17:18,878 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 89 states have (on average 1.4606741573033708) internal successors, (130), 88 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-06 11:17:18,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:18,879 INFO L225 Difference]: With dead ends: 146 [2021-05-06 11:17:18,879 INFO L226 Difference]: Without dead ends: 138 [2021-05-06 11:17:18,880 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 37 SyntacticMatches, 7 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5158 ImplicationChecksByTransitivity, 9317.7ms TimeCoverageRelationStatistics Valid=568, Invalid=30584, Unknown=0, NotChecked=0, Total=31152 [2021-05-06 11:17:18,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-06 11:17:18,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2021-05-06 11:17:18,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:18,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-06 11:17:18,900 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 134 [2021-05-06 11:17:18,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:18,900 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-06 11:17:18,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 89 states have (on average 1.4606741573033708) internal successors, (130), 88 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:18,900 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-06 11:17:18,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-06 11:17:18,900 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:18,900 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:18,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable389 [2021-05-06 11:17:18,901 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:18,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:18,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1333283277, now seen corresponding path program 78 times [2021-05-06 11:17:18,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:18,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184336932] [2021-05-06 11:17:18,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:18,907 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:17:18,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:18,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:18,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:18,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:18,926 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:17:18,932 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:18,935 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:17:18,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:18,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:18,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:17:18,950 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:17:18,972 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:17:18,991 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:18,993 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:18,996 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:17:19,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:19,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:19,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:19,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:19,043 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:17:19,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:19,065 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:17:19,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:19,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:19,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:19,101 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:19,102 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:17:19,109 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:19,109 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:19,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:19,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:19,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:19,201 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 11:17:19,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:22,963 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:22,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184336932] [2021-05-06 11:17:22,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1184336932] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:22,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:22,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 11:17:22,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658730977] [2021-05-06 11:17:22,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 11:17:22,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:22,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 11:17:22,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8492, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:17:22,964 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 91 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 89 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:31,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:31,655 INFO L93 Difference]: Finished difference Result 144 states and 146 transitions. [2021-05-06 11:17:31,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-06 11:17:31,655 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 89 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-06 11:17:31,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:31,656 INFO L225 Difference]: With dead ends: 144 [2021-05-06 11:17:31,656 INFO L226 Difference]: Without dead ends: 139 [2021-05-06 11:17:31,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7530 ImplicationChecksByTransitivity, 8332.6ms TimeCoverageRelationStatistics Valid=653, Invalid=31209, Unknown=0, NotChecked=0, Total=31862 [2021-05-06 11:17:31,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-06 11:17:31,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2021-05-06 11:17:31,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 133 states have (on average 1.0225563909774436) internal successors, (136), 133 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:31,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 140 transitions. [2021-05-06 11:17:31,675 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 140 transitions. Word has length 134 [2021-05-06 11:17:31,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:31,675 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 140 transitions. [2021-05-06 11:17:31,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 89 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:31,675 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 140 transitions. [2021-05-06 11:17:31,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 11:17:31,675 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:31,675 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 40, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:31,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable394 [2021-05-06 11:17:31,676 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:31,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:31,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1533963112, now seen corresponding path program 79 times [2021-05-06 11:17:31,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:31,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691288019] [2021-05-06 11:17:31,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:31,681 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:17:31,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:31,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:31,702 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:17:31,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:31,711 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:17:31,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:17:31,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:17:31,746 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:17:31,763 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:31,764 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:31,766 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:17:31,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:31,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:31,803 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:17:31,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:31,823 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:17:31,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:31,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:31,847 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:31,848 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:17:31,855 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 11:17:31,856 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:31,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:31,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:31,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:31,915 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 11:17:31,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:31,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:35,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:35,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691288019] [2021-05-06 11:17:35,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1691288019] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:35,788 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:35,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:17:35,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419296280] [2021-05-06 11:17:35,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:17:35,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:35,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:17:35,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=8718, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:17:35,789 INFO L87 Difference]: Start difference. First operand 138 states and 140 transitions. Second operand has 92 states, 91 states have (on average 1.4615384615384615) internal successors, (133), 90 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:45,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:45,103 INFO L93 Difference]: Finished difference Result 149 states and 153 transitions. [2021-05-06 11:17:45,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:17:45,104 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.4615384615384615) internal successors, (133), 90 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-06 11:17:45,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:45,104 INFO L225 Difference]: With dead ends: 149 [2021-05-06 11:17:45,104 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 11:17:45,105 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 39 SyntacticMatches, 6 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5359 ImplicationChecksByTransitivity, 9165.0ms TimeCoverageRelationStatistics Valid=580, Invalid=32000, Unknown=0, NotChecked=0, Total=32580 [2021-05-06 11:17:45,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 11:17:45,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-06 11:17:45,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:45,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-06 11:17:45,124 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 137 [2021-05-06 11:17:45,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:45,124 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-06 11:17:45,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 91 states have (on average 1.4615384615384615) internal successors, (133), 90 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:45,125 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-06 11:17:45,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 11:17:45,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:45,125 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:45,125 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable399 [2021-05-06 11:17:45,125 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:45,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:45,126 INFO L82 PathProgramCache]: Analyzing trace with hash -985996822, now seen corresponding path program 80 times [2021-05-06 11:17:45,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:45,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976479602] [2021-05-06 11:17:45,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:45,132 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:17:45,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:45,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:45,154 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:17:45,161 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:45,163 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:17:45,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:17:45,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:17:45,201 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:17:45,218 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:45,219 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:45,221 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:17:45,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:45,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:45,257 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:17:45,276 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:45,279 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:17:45,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:45,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:45,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:45,300 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:17:45,307 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 11:17:45,308 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:45,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:45,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:45,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:45,364 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 11:17:45,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:49,214 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:49,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976479602] [2021-05-06 11:17:49,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1976479602] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:49,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:49,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2021-05-06 11:17:49,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552543052] [2021-05-06 11:17:49,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2021-05-06 11:17:49,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:49,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-05-06 11:17:49,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=8687, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:17:49,216 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 93 states, 92 states have (on average 1.4456521739130435) internal successors, (133), 91 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:58,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:58,275 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2021-05-06 11:17:58,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:17:58,275 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 92 states have (on average 1.4456521739130435) internal successors, (133), 91 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-06 11:17:58,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:58,276 INFO L225 Difference]: With dead ends: 147 [2021-05-06 11:17:58,276 INFO L226 Difference]: Without dead ends: 142 [2021-05-06 11:17:58,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7499 ImplicationChecksByTransitivity, 8554.8ms TimeCoverageRelationStatistics Valid=648, Invalid=32294, Unknown=0, NotChecked=0, Total=32942 [2021-05-06 11:17:58,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-06 11:17:58,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2021-05-06 11:17:58,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:58,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-06 11:17:58,297 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-06 11:17:58,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:58,297 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-06 11:17:58,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 93 states, 92 states have (on average 1.4456521739130435) internal successors, (133), 91 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:58,297 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-06 11:17:58,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 11:17:58,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:58,297 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:58,298 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable404 [2021-05-06 11:17:58,298 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:58,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:58,298 INFO L82 PathProgramCache]: Analyzing trace with hash 999424555, now seen corresponding path program 81 times [2021-05-06 11:17:58,298 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:58,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621249754] [2021-05-06 11:17:58,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:58,304 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:17:58,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:58,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:58,324 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:17:58,330 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,333 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:17:58,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:17:58,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:17:58,372 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:17:58,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:58,392 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:17:58,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:58,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:58,430 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:17:58,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,450 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:17:58,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:58,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:58,469 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:17:58,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,478 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:58,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:58,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:58,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:58,540 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 11:17:58,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:02,917 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:02,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621249754] [2021-05-06 11:18:02,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [621249754] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:02,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:02,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:18:02,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916826642] [2021-05-06 11:18:02,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:18:02,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:02,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:18:02,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=9096, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:18:02,918 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 94 states, 93 states have (on average 1.4623655913978495) internal successors, (136), 92 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:13,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:13,048 INFO L93 Difference]: Finished difference Result 152 states and 156 transitions. [2021-05-06 11:18:13,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 11:18:13,048 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 1.4623655913978495) internal successors, (136), 92 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2021-05-06 11:18:13,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:13,049 INFO L225 Difference]: With dead ends: 152 [2021-05-06 11:18:13,049 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:18:13,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 38 SyntacticMatches, 8 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5594 ImplicationChecksByTransitivity, 10163.1ms TimeCoverageRelationStatistics Valid=592, Invalid=33448, Unknown=0, NotChecked=0, Total=34040 [2021-05-06 11:18:13,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:18:13,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 142. [2021-05-06 11:18:13,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0218978102189782) internal successors, (140), 137 states have internal predecessors, (140), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:13,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 144 transitions. [2021-05-06 11:18:13,069 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 144 transitions. Word has length 140 [2021-05-06 11:18:13,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:13,069 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 144 transitions. [2021-05-06 11:18:13,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 93 states have (on average 1.4623655913978495) internal successors, (136), 92 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:13,069 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 144 transitions. [2021-05-06 11:18:13,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 11:18:13,069 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:13,070 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:13,070 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable409 [2021-05-06 11:18:13,070 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:13,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:13,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1520535379, now seen corresponding path program 82 times [2021-05-06 11:18:13,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:13,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924047878] [2021-05-06 11:18:13,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:13,075 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:18:13,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:13,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:13,095 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:18:13,101 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:13,103 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:18:13,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:18:13,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:18:13,138 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:18:13,155 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:13,156 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:13,159 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:18:13,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:13,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:13,194 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:18:13,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:13,215 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:18:13,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:13,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:13,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:13,238 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:18:13,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:13,245 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:13,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:13,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:13,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:13,306 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 11:18:13,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:17,828 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:17,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924047878] [2021-05-06 11:18:17,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [924047878] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:17,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:17,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 11:18:17,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949785321] [2021-05-06 11:18:17,829 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 11:18:17,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:17,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 11:18:17,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=9288, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:18:17,829 INFO L87 Difference]: Start difference. First operand 142 states and 144 transitions. Second operand has 95 states, 94 states have (on average 1.446808510638298) internal successors, (136), 93 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:28,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:28,030 INFO L93 Difference]: Finished difference Result 150 states and 152 transitions. [2021-05-06 11:18:28,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 11:18:28,031 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 94 states have (on average 1.446808510638298) internal successors, (136), 93 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2021-05-06 11:18:28,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:28,031 INFO L225 Difference]: With dead ends: 150 [2021-05-06 11:18:28,032 INFO L226 Difference]: Without dead ends: 145 [2021-05-06 11:18:28,033 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 38 SyntacticMatches, 8 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5688 ImplicationChecksByTransitivity, 10362.3ms TimeCoverageRelationStatistics Valid=598, Invalid=34184, Unknown=0, NotChecked=0, Total=34782 [2021-05-06 11:18:28,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-06 11:18:28,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2021-05-06 11:18:28,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.0215827338129497) internal successors, (142), 139 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:28,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 146 transitions. [2021-05-06 11:18:28,053 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 146 transitions. Word has length 140 [2021-05-06 11:18:28,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:28,053 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 146 transitions. [2021-05-06 11:18:28,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 94 states have (on average 1.446808510638298) internal successors, (136), 93 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:28,053 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 146 transitions. [2021-05-06 11:18:28,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:18:28,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:28,054 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 42, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:28,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable414 [2021-05-06 11:18:28,054 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:28,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:28,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1994960760, now seen corresponding path program 83 times [2021-05-06 11:18:28,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:28,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638351146] [2021-05-06 11:18:28,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:28,060 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:18:28,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,069 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:28,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:28,091 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:18:28,097 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:28,100 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:18:28,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:18:28,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:18:28,138 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:18:28,156 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:28,157 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:28,160 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:18:28,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:28,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:28,198 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:18:28,215 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:28,219 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:18:28,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:28,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:28,242 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:28,244 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:18:28,252 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:28,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:28,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:28,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:28,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:28,326 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 11:18:28,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:28,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:32,951 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:32,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638351146] [2021-05-06 11:18:32,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1638351146] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:32,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:32,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2021-05-06 11:18:32,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163749050] [2021-05-06 11:18:32,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2021-05-06 11:18:32,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:32,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-05-06 11:18:32,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=9482, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:18:32,952 INFO L87 Difference]: Start difference. First operand 144 states and 146 transitions. Second operand has 96 states, 95 states have (on average 1.4631578947368422) internal successors, (139), 94 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:43,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:43,581 INFO L93 Difference]: Finished difference Result 155 states and 159 transitions. [2021-05-06 11:18:43,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 11:18:43,581 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 1.4631578947368422) internal successors, (139), 94 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-06 11:18:43,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:43,582 INFO L225 Difference]: With dead ends: 155 [2021-05-06 11:18:43,582 INFO L226 Difference]: Without dead ends: 147 [2021-05-06 11:18:43,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 41 SyntacticMatches, 6 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5787 ImplicationChecksByTransitivity, 10632.9ms TimeCoverageRelationStatistics Valid=604, Invalid=34928, Unknown=0, NotChecked=0, Total=35532 [2021-05-06 11:18:43,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-06 11:18:43,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 145. [2021-05-06 11:18:43,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:43,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-05-06 11:18:43,603 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 143 [2021-05-06 11:18:43,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:43,603 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-05-06 11:18:43,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 96 states, 95 states have (on average 1.4631578947368422) internal successors, (139), 94 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:43,603 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-05-06 11:18:43,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:18:43,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:43,603 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:43,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable419 [2021-05-06 11:18:43,604 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:43,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:43,604 INFO L82 PathProgramCache]: Analyzing trace with hash -219953398, now seen corresponding path program 84 times [2021-05-06 11:18:43,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:43,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545247752] [2021-05-06 11:18:43,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:43,610 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:18:43,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:43,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:43,631 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:18:43,637 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:43,639 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:18:43,640 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,641 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:18:43,655 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:18:43,675 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:18:43,691 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:43,692 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:43,694 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:18:43,705 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:43,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:43,733 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:18:43,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:43,754 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:18:43,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:43,775 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:43,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:43,778 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:18:43,785 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:43,786 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:43,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:43,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:43,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:43,879 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 11:18:43,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:48,476 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:48,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545247752] [2021-05-06 11:18:48,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [545247752] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:48,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:48,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 11:18:48,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756154328] [2021-05-06 11:18:48,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 11:18:48,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:48,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 11:18:48,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=9678, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:18:48,477 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 97 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 95 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:59,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:59,059 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2021-05-06 11:18:59,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 11:18:59,060 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 95 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-06 11:18:59,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:59,060 INFO L225 Difference]: With dead ends: 153 [2021-05-06 11:18:59,060 INFO L226 Difference]: Without dead ends: 148 [2021-05-06 11:18:59,061 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5873 ImplicationChecksByTransitivity, 10654.7ms TimeCoverageRelationStatistics Valid=610, Invalid=35680, Unknown=0, NotChecked=0, Total=36290 [2021-05-06 11:18:59,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-06 11:18:59,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2021-05-06 11:18:59,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:59,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-06 11:18:59,082 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 143 [2021-05-06 11:18:59,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:59,082 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-06 11:18:59,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 95 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:59,082 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-06 11:18:59,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 11:18:59,083 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:59,083 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 43, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:59,083 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable424 [2021-05-06 11:18:59,083 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:59,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:59,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1257142005, now seen corresponding path program 85 times [2021-05-06 11:18:59,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:59,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807038072] [2021-05-06 11:18:59,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:59,093 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:18:59,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:59,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:59,117 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:18:59,123 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 11:18:59,126 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:18:59,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:18:59,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:18:59,165 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:18:59,182 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:59,183 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:59,186 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:18:59,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:59,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:59,250 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:18:59,267 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:59,271 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:18:59,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:59,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:59,282 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:59,292 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:18:59,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:59,299 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:59,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:59,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:59,352 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 11:18:59,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:59,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:03,498 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:03,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807038072] [2021-05-06 11:19:03,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [807038072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:03,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:03,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:19:03,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074070706] [2021-05-06 11:19:03,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:19:03,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:03,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:19:03,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=9832, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:19:03,499 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 98 states, 97 states have (on average 1.4639175257731958) internal successors, (142), 96 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:13,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:13,446 INFO L93 Difference]: Finished difference Result 158 states and 162 transitions. [2021-05-06 11:19:13,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 11:19:13,446 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 1.4639175257731958) internal successors, (142), 96 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-06 11:19:13,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:13,447 INFO L225 Difference]: With dead ends: 158 [2021-05-06 11:19:13,447 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 11:19:13,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8682 ImplicationChecksByTransitivity, 9311.9ms TimeCoverageRelationStatistics Valid=703, Invalid=36353, Unknown=0, NotChecked=0, Total=37056 [2021-05-06 11:19:13,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 11:19:13,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2021-05-06 11:19:13,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:13,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-06 11:19:13,469 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 146 [2021-05-06 11:19:13,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:13,470 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-06 11:19:13,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 97 states have (on average 1.4639175257731958) internal successors, (142), 96 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:13,470 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-06 11:19:13,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 11:19:13,470 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:13,470 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:13,470 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable429 [2021-05-06 11:19:13,470 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:13,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:13,471 INFO L82 PathProgramCache]: Analyzing trace with hash 517865357, now seen corresponding path program 86 times [2021-05-06 11:19:13,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:13,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227220078] [2021-05-06 11:19:13,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:13,477 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:19:13,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:13,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:13,499 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:19:13,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:13,508 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:19:13,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:19:13,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:19:13,545 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:19:13,563 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:13,564 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:13,566 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:19:13,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:13,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:13,606 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:19:13,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:13,627 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:19:13,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:13,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:13,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:13,649 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:19:13,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:13,657 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:13,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:13,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:13,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:13,710 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 11:19:13,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:13,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:17,999 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:18,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227220078] [2021-05-06 11:19:18,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1227220078] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:18,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:18,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2021-05-06 11:19:18,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570143508] [2021-05-06 11:19:18,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2021-05-06 11:19:18,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:18,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-05-06 11:19:18,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=10032, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:19:18,001 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 99 states, 98 states have (on average 1.4489795918367347) internal successors, (142), 97 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:28,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:28,155 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2021-05-06 11:19:28,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-06 11:19:28,155 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 98 states have (on average 1.4489795918367347) internal successors, (142), 97 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-06 11:19:28,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:28,156 INFO L225 Difference]: With dead ends: 156 [2021-05-06 11:19:28,156 INFO L226 Difference]: Without dead ends: 151 [2021-05-06 11:19:28,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8892 ImplicationChecksByTransitivity, 9534.0ms TimeCoverageRelationStatistics Valid=709, Invalid=37121, Unknown=0, NotChecked=0, Total=37830 [2021-05-06 11:19:28,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-06 11:19:28,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2021-05-06 11:19:28,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 145 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:28,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2021-05-06 11:19:28,179 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 146 [2021-05-06 11:19:28,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:28,179 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2021-05-06 11:19:28,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 99 states, 98 states have (on average 1.4489795918367347) internal successors, (142), 97 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:28,179 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2021-05-06 11:19:28,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 11:19:28,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:28,180 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 44, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:28,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable434 [2021-05-06 11:19:28,180 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:28,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:28,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1753734568, now seen corresponding path program 87 times [2021-05-06 11:19:28,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:28,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272926669] [2021-05-06 11:19:28,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:28,186 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:19:28,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:28,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:28,210 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:19:28,216 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:28,218 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:19:28,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:19:28,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:19:28,253 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:19:28,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:28,270 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:28,272 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:19:28,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:28,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:28,310 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:19:28,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:28,337 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:19:28,352 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:28,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:28,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:28,368 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:19:28,375 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 11:19:28,376 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:28,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:28,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:28,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:28,450 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 11:19:28,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:33,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:33,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272926669] [2021-05-06 11:19:33,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1272926669] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:33,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:33,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 11:19:33,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126632435] [2021-05-06 11:19:33,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 11:19:33,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:33,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 11:19:33,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=10278, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:19:33,201 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand has 100 states, 99 states have (on average 1.4646464646464648) internal successors, (145), 98 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:44,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:44,522 INFO L93 Difference]: Finished difference Result 161 states and 165 transitions. [2021-05-06 11:19:44,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:19:44,522 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 1.4646464646464648) internal successors, (145), 98 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-06 11:19:44,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:44,523 INFO L225 Difference]: With dead ends: 161 [2021-05-06 11:19:44,523 INFO L226 Difference]: Without dead ends: 153 [2021-05-06 11:19:44,525 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6211 ImplicationChecksByTransitivity, 11163.8ms TimeCoverageRelationStatistics Valid=628, Invalid=37984, Unknown=0, NotChecked=0, Total=38612 [2021-05-06 11:19:44,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-06 11:19:44,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 151. [2021-05-06 11:19:44,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:44,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-06 11:19:44,550 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 149 [2021-05-06 11:19:44,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:44,550 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-06 11:19:44,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 99 states have (on average 1.4646464646464648) internal successors, (145), 98 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:44,551 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-06 11:19:44,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 11:19:44,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:44,551 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:44,551 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable439 [2021-05-06 11:19:44,551 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:44,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:44,551 INFO L82 PathProgramCache]: Analyzing trace with hash -766225366, now seen corresponding path program 88 times [2021-05-06 11:19:44,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:44,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552434670] [2021-05-06 11:19:44,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:44,557 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:19:44,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:44,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:44,582 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:19:44,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:44,591 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:19:44,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:19:44,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:19:44,629 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:19:44,647 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:44,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:44,650 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:19:44,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:44,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:44,688 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:19:44,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:44,709 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:19:44,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:44,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:44,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:44,732 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:19:44,739 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 11:19:44,740 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:44,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:44,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:44,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:44,792 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 11:19:44,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:49,418 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:49,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552434670] [2021-05-06 11:19:49,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1552434670] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:49,418 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:49,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2021-05-06 11:19:49,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109431091] [2021-05-06 11:19:49,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 101 states [2021-05-06 11:19:49,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:49,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-05-06 11:19:49,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=10437, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:19:49,420 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 101 states, 100 states have (on average 1.45) internal successors, (145), 99 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:59,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:59,890 INFO L93 Difference]: Finished difference Result 159 states and 161 transitions. [2021-05-06 11:19:59,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 11:19:59,890 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 100 states have (on average 1.45) internal successors, (145), 99 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-06 11:19:59,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:59,891 INFO L225 Difference]: With dead ends: 159 [2021-05-06 11:19:59,891 INFO L226 Difference]: Without dead ends: 154 [2021-05-06 11:19:59,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9286 ImplicationChecksByTransitivity, 10158.6ms TimeCoverageRelationStatistics Valid=723, Invalid=38679, Unknown=0, NotChecked=0, Total=39402 [2021-05-06 11:19:59,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-06 11:19:59,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-05-06 11:19:59,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 148 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:59,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-05-06 11:19:59,914 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 149 [2021-05-06 11:19:59,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:59,914 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-05-06 11:19:59,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 101 states, 100 states have (on average 1.45) internal successors, (145), 99 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:59,914 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-05-06 11:19:59,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-05-06 11:19:59,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:59,915 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 45, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:59,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable444 [2021-05-06 11:19:59,915 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:59,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:59,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1614256149, now seen corresponding path program 89 times [2021-05-06 11:19:59,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:59,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896671615] [2021-05-06 11:19:59,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:59,922 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:19:59,922 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:59,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:59,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:59,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:59,942 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:19:59,948 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:59,951 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:19:59,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:59,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:59,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:19:59,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:19:59,988 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:20:00,005 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:00,006 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:00,009 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:20:00,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:00,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:00,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:00,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:00,047 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:20:00,065 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:00,068 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:20:00,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:00,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:00,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:00,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:00,089 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:20:00,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:00,096 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:00,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:00,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:00,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:00,151 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 11:20:00,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:05,215 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:05,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896671615] [2021-05-06 11:20:05,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1896671615] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:05,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:05,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2021-05-06 11:20:05,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997725875] [2021-05-06 11:20:05,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2021-05-06 11:20:05,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:05,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-05-06 11:20:05,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=10642, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:20:05,216 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 102 states, 101 states have (on average 1.4653465346534653) internal successors, (148), 100 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:16,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:16,523 INFO L93 Difference]: Finished difference Result 164 states and 168 transitions. [2021-05-06 11:20:16,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-05-06 11:20:16,523 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 1.4653465346534653) internal successors, (148), 100 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2021-05-06 11:20:16,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:16,524 INFO L225 Difference]: With dead ends: 164 [2021-05-06 11:20:16,524 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 11:20:16,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 43 SyntacticMatches, 7 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9445 ImplicationChecksByTransitivity, 10995.3ms TimeCoverageRelationStatistics Valid=731, Invalid=39469, Unknown=0, NotChecked=0, Total=40200 [2021-05-06 11:20:16,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 11:20:16,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2021-05-06 11:20:16,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 149 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:16,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 156 transitions. [2021-05-06 11:20:16,549 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 156 transitions. Word has length 152 [2021-05-06 11:20:16,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:16,549 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 156 transitions. [2021-05-06 11:20:16,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 102 states, 101 states have (on average 1.4653465346534653) internal successors, (148), 100 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:16,550 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 156 transitions. [2021-05-06 11:20:16,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-05-06 11:20:16,550 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:16,550 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:16,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable449 [2021-05-06 11:20:16,550 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:16,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:16,550 INFO L82 PathProgramCache]: Analyzing trace with hash 160751213, now seen corresponding path program 90 times [2021-05-06 11:20:16,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:16,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471254132] [2021-05-06 11:20:16,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:16,556 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:20:16,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:16,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:16,580 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:20:16,587 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 11:20:16,589 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:20:16,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:20:16,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:20:16,627 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:20:16,647 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:16,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:16,650 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:20:16,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,660 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:16,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:16,686 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:20:16,702 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:16,705 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:20:16,716 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:16,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:16,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:16,727 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:20:16,734 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 11:20:16,734 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:16,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:16,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:16,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:16,789 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 11:20:16,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:16,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:21,976 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:21,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1471254132] [2021-05-06 11:20:21,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1471254132] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:21,976 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:21,976 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [103] imperfect sequences [] total 103 [2021-05-06 11:20:21,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440341936] [2021-05-06 11:20:21,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 103 states [2021-05-06 11:20:21,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:21,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-05-06 11:20:21,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=10850, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:20:21,978 INFO L87 Difference]: Start difference. First operand 154 states and 156 transitions. Second operand has 103 states, 102 states have (on average 1.4509803921568627) internal successors, (148), 101 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:33,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:33,576 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2021-05-06 11:20:33,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-06 11:20:33,577 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 102 states have (on average 1.4509803921568627) internal successors, (148), 101 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2021-05-06 11:20:33,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:33,578 INFO L225 Difference]: With dead ends: 162 [2021-05-06 11:20:33,578 INFO L226 Difference]: Without dead ends: 157 [2021-05-06 11:20:33,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9615 ImplicationChecksByTransitivity, 11272.1ms TimeCoverageRelationStatistics Valid=737, Invalid=40269, Unknown=0, NotChecked=0, Total=41006 [2021-05-06 11:20:33,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-06 11:20:33,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2021-05-06 11:20:33,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 151 states have (on average 1.0198675496688743) internal successors, (154), 151 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:33,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 158 transitions. [2021-05-06 11:20:33,613 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 158 transitions. Word has length 152 [2021-05-06 11:20:33,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:33,613 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 158 transitions. [2021-05-06 11:20:33,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 103 states, 102 states have (on average 1.4509803921568627) internal successors, (148), 101 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:33,613 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 158 transitions. [2021-05-06 11:20:33,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:20:33,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:33,614 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:33,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable454 [2021-05-06 11:20:33,614 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:33,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:33,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1600262856, now seen corresponding path program 91 times [2021-05-06 11:20:33,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:33,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044204953] [2021-05-06 11:20:33,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:33,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:20:33,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,649 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:33,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:33,653 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:20:33,681 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:33,685 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:20:33,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:20:33,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:20:33,734 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:20:33,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:33,755 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:33,758 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:20:33,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:33,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:33,807 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:20:33,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:33,832 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:20:33,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:33,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:33,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:33,862 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:20:33,870 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:33,871 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:33,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:33,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:33,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:33,940 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 11:20:33,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:39,327 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:39,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044204953] [2021-05-06 11:20:39,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1044204953] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:39,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:39,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2021-05-06 11:20:39,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159609033] [2021-05-06 11:20:39,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2021-05-06 11:20:39,328 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:39,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-05-06 11:20:39,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=11059, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:20:39,329 INFO L87 Difference]: Start difference. First operand 156 states and 158 transitions. Second operand has 104 states, 103 states have (on average 1.4660194174757282) internal successors, (151), 102 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:50,830 INFO L93 Difference]: Finished difference Result 167 states and 171 transitions. [2021-05-06 11:20:50,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-05-06 11:20:50,830 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 103 states have (on average 1.4660194174757282) internal successors, (151), 102 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:20:50,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:50,831 INFO L225 Difference]: With dead ends: 167 [2021-05-06 11:20:50,831 INFO L226 Difference]: Without dead ends: 159 [2021-05-06 11:20:50,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 44 SyntacticMatches, 7 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9815 ImplicationChecksByTransitivity, 11394.0ms TimeCoverageRelationStatistics Valid=745, Invalid=41075, Unknown=0, NotChecked=0, Total=41820 [2021-05-06 11:20:50,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-06 11:20:50,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 157. [2021-05-06 11:20:50,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-06 11:20:50,859 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 155 [2021-05-06 11:20:50,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:50,859 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-06 11:20:50,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 104 states, 103 states have (on average 1.4660194174757282) internal successors, (151), 102 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,859 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-06 11:20:50,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:20:50,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:50,860 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:50,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable459 [2021-05-06 11:20:50,860 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:50,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:50,860 INFO L82 PathProgramCache]: Analyzing trace with hash -919697078, now seen corresponding path program 92 times [2021-05-06 11:20:50,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:50,860 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317848737] [2021-05-06 11:20:50,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:50,866 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:20:50,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:50,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:50,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:50,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:50,886 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:20:50,893 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 11:20:50,896 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:20:50,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:50,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:50,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:20:50,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:20:50,934 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:20:50,952 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:50,953 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:50,956 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:20:50,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:50,969 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:50,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:50,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:50,997 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:20:51,015 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:51,019 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:20:51,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:51,034 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:51,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:51,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:51,049 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:20:51,056 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:51,056 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:51,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:51,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,121 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 11:20:51,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:56,378 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:56,378 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317848737] [2021-05-06 11:20:56,378 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [317848737] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:56,378 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:56,378 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2021-05-06 11:20:56,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589604804] [2021-05-06 11:20:56,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 105 states [2021-05-06 11:20:56,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:56,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-05-06 11:20:56,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=11271, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:20:56,380 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 105 states, 104 states have (on average 1.4519230769230769) internal successors, (151), 103 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:07,628 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2021-05-06 11:21:07,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-06 11:21:07,629 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 104 states have (on average 1.4519230769230769) internal successors, (151), 103 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:21:07,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:07,629 INFO L225 Difference]: With dead ends: 165 [2021-05-06 11:21:07,629 INFO L226 Difference]: Without dead ends: 160 [2021-05-06 11:21:07,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 44 SyntacticMatches, 7 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10011 ImplicationChecksByTransitivity, 11187.5ms TimeCoverageRelationStatistics Valid=751, Invalid=41891, Unknown=0, NotChecked=0, Total=42642 [2021-05-06 11:21:07,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-06 11:21:07,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2021-05-06 11:21:07,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2021-05-06 11:21:07,655 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 155 [2021-05-06 11:21:07,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:07,655 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2021-05-06 11:21:07,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 105 states, 104 states have (on average 1.4519230769230769) internal successors, (151), 103 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,655 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2021-05-06 11:21:07,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-06 11:21:07,656 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:07,656 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 47, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:07,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable464 [2021-05-06 11:21:07,656 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:07,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:07,656 INFO L82 PathProgramCache]: Analyzing trace with hash 450141899, now seen corresponding path program 93 times [2021-05-06 11:21:07,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:07,656 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075206657] [2021-05-06 11:21:07,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:07,664 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:21:07,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:07,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:07,681 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:21:07,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:07,689 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:21:07,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:21:07,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:21:07,719 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:21:07,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:07,732 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:07,734 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:21:07,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,745 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:07,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:07,764 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:21:07,776 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:07,779 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:21:07,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:07,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:21:07,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:21:07,799 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:21:07,804 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 11:21:07,805 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:07,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:07,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,854 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 11:21:07,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:21:07,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:21:12,212 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:12,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075206657] [2021-05-06 11:21:12,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1075206657] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:12,212 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:12,212 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2021-05-06 11:21:12,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588046391] [2021-05-06 11:21:12,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 106 states [2021-05-06 11:21:12,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:12,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-05-06 11:21:12,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=11484, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:21:12,213 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 106 states, 105 states have (on average 1.4666666666666666) internal successors, (154), 104 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:23,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:23,553 INFO L93 Difference]: Finished difference Result 170 states and 174 transitions. [2021-05-06 11:21:23,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-05-06 11:21:23,553 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 1.4666666666666666) internal successors, (154), 104 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2021-05-06 11:21:23,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:23,554 INFO L225 Difference]: With dead ends: 170 [2021-05-06 11:21:23,554 INFO L226 Difference]: Without dead ends: 162 [2021-05-06 11:21:23,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 42 SyntacticMatches, 10 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10222 ImplicationChecksByTransitivity, 10222.5ms TimeCoverageRelationStatistics Valid=759, Invalid=42713, Unknown=0, NotChecked=0, Total=43472 [2021-05-06 11:21:23,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-06 11:21:23,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2021-05-06 11:21:23,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0193548387096774) internal successors, (158), 155 states have internal predecessors, (158), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:23,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2021-05-06 11:21:23,581 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 158 [2021-05-06 11:21:23,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:23,581 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2021-05-06 11:21:23,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 106 states, 105 states have (on average 1.4666666666666666) internal successors, (154), 104 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:23,581 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2021-05-06 11:21:23,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-06 11:21:23,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:23,582 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:23,582 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable469 [2021-05-06 11:21:23,582 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:23,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:23,582 INFO L82 PathProgramCache]: Analyzing trace with hash -2069818035, now seen corresponding path program 94 times [2021-05-06 11:21:23,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:23,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494454785] [2021-05-06 11:21:23,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:23,588 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:21:23,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:23,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:23,610 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:21:23,617 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:23,619 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:21:23,620 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,621 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:21:23,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:21:23,656 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:21:23,674 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:23,675 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:23,677 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:21:23,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,679 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:23,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:23,713 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:21:23,730 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:23,734 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:21:23,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:23,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:21:23,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:21:23,759 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:21:23,765 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 11:21:23,766 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:23,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:23,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:23,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:23,826 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 11:21:23,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:21:29,331 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:29,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494454785] [2021-05-06 11:21:29,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [494454785] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:29,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:29,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [107] imperfect sequences [] total 107 [2021-05-06 11:21:29,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202765372] [2021-05-06 11:21:29,332 INFO L460 AbstractCegarLoop]: Interpolant automaton has 107 states [2021-05-06 11:21:29,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:29,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-05-06 11:21:29,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=11748, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 11:21:29,333 INFO L87 Difference]: Start difference. First operand 160 states and 162 transitions. Second operand has 107 states, 106 states have (on average 1.4528301886792452) internal successors, (154), 105 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:42,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:42,116 INFO L93 Difference]: Finished difference Result 168 states and 170 transitions. [2021-05-06 11:21:42,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-06 11:21:42,116 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 106 states have (on average 1.4528301886792452) internal successors, (154), 105 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2021-05-06 11:21:42,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:42,117 INFO L225 Difference]: With dead ends: 168 [2021-05-06 11:21:42,117 INFO L226 Difference]: Without dead ends: 163 [2021-05-06 11:21:42,136 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 45 SyntacticMatches, 7 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7052 ImplicationChecksByTransitivity, 12713.2ms TimeCoverageRelationStatistics Valid=670, Invalid=43640, Unknown=0, NotChecked=0, Total=44310 [2021-05-06 11:21:42,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-05-06 11:21:42,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2021-05-06 11:21:42,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.019108280254777) internal successors, (160), 157 states have internal predecessors, (160), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:42,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 164 transitions. [2021-05-06 11:21:42,160 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 164 transitions. Word has length 158 [2021-05-06 11:21:42,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:42,161 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 164 transitions. [2021-05-06 11:21:42,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 107 states, 106 states have (on average 1.4528301886792452) internal successors, (154), 105 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:42,161 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 164 transitions. [2021-05-06 11:21:42,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:21:42,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:42,161 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 48, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:42,161 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable474 [2021-05-06 11:21:42,162 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:42,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:42,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1849167896, now seen corresponding path program 95 times [2021-05-06 11:21:42,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:42,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747214529] [2021-05-06 11:21:42,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:42,168 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:21:42,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:42,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:42,188 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:21:42,194 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 11:21:42,197 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:21:42,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:21:42,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:21:42,233 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:21:42,249 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:42,250 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:42,252 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:21:42,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:42,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:42,289 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:21:42,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:42,308 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:21:42,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:42,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:21:42,318 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:21:42,328 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:21:42,334 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 11:21:42,335 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:42,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:42,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:42,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:42,403 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 11:21:42,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:21:47,173 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:47,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747214529] [2021-05-06 11:21:47,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [747214529] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:47,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:47,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2021-05-06 11:21:47,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636054393] [2021-05-06 11:21:47,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 108 states [2021-05-06 11:21:47,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:47,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-05-06 11:21:47,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=11917, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:21:47,175 INFO L87 Difference]: Start difference. First operand 162 states and 164 transitions. Second operand has 108 states, 107 states have (on average 1.4672897196261683) internal successors, (157), 106 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:59,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:59,631 INFO L93 Difference]: Finished difference Result 173 states and 177 transitions. [2021-05-06 11:21:59,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-05-06 11:21:59,632 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 107 states have (on average 1.4672897196261683) internal successors, (157), 106 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-06 11:21:59,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:59,632 INFO L225 Difference]: With dead ends: 173 [2021-05-06 11:21:59,633 INFO L226 Difference]: Without dead ends: 165 [2021-05-06 11:21:59,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 48 SyntacticMatches, 5 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10546 ImplicationChecksByTransitivity, 11287.3ms TimeCoverageRelationStatistics Valid=773, Invalid=44383, Unknown=0, NotChecked=0, Total=45156 [2021-05-06 11:21:59,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-06 11:21:59,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 163. [2021-05-06 11:21:59,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:59,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-06 11:21:59,668 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 161 [2021-05-06 11:21:59,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:59,668 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-06 11:21:59,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 108 states, 107 states have (on average 1.4672897196261683) internal successors, (157), 106 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:59,669 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-06 11:21:59,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:21:59,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:59,685 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:59,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable479 [2021-05-06 11:21:59,685 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:59,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:59,686 INFO L82 PathProgramCache]: Analyzing trace with hash -74160534, now seen corresponding path program 96 times [2021-05-06 11:21:59,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:59,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280687484] [2021-05-06 11:21:59,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:59,719 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:21:59,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:59,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:59,754 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:21:59,762 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:59,765 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:21:59,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:21:59,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:21:59,810 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:21:59,831 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:59,832 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:59,848 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:21:59,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:59,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:59,897 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:21:59,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:59,941 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:21:59,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:59,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:21:59,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:21:59,971 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:21:59,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:59,980 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:59,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:00,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:00,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:00,116 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 11:22:00,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:22:06,223 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:06,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280687484] [2021-05-06 11:22:06,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1280687484] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:06,224 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:06,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [109] imperfect sequences [] total 109 [2021-05-06 11:22:06,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519816036] [2021-05-06 11:22:06,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 109 states [2021-05-06 11:22:06,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:06,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-05-06 11:22:06,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=12186, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 11:22:06,225 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 109 states, 108 states have (on average 1.4537037037037037) internal successors, (157), 107 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:20,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:20,342 INFO L93 Difference]: Finished difference Result 171 states and 173 transitions. [2021-05-06 11:22:20,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-05-06 11:22:20,342 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 108 states have (on average 1.4537037037037037) internal successors, (157), 107 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-06 11:22:20,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:20,343 INFO L225 Difference]: With dead ends: 171 [2021-05-06 11:22:20,343 INFO L226 Difference]: Without dead ends: 166 [2021-05-06 11:22:20,345 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 45 SyntacticMatches, 8 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7305 ImplicationChecksByTransitivity, 13972.8ms TimeCoverageRelationStatistics Valid=682, Invalid=45328, Unknown=0, NotChecked=0, Total=46010 [2021-05-06 11:22:20,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-06 11:22:20,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2021-05-06 11:22:20,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:20,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-05-06 11:22:20,372 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 161 [2021-05-06 11:22:20,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:20,372 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-05-06 11:22:20,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 109 states, 108 states have (on average 1.4537037037037037) internal successors, (157), 107 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:20,372 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-05-06 11:22:20,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-06 11:22:20,373 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:20,373 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 49, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:20,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable484 [2021-05-06 11:22:20,373 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:20,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:20,373 INFO L82 PathProgramCache]: Analyzing trace with hash -153866837, now seen corresponding path program 97 times [2021-05-06 11:22:20,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:20,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379622715] [2021-05-06 11:22:20,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:20,380 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:22:20,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:22:20,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:22:20,406 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:22:20,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:20,415 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:22:20,416 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:22:20,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:22:20,452 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:22:20,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:20,471 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:22:20,473 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:22:20,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,486 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:22:20,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:22:20,512 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:22:20,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:20,534 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:22:20,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:20,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:22:20,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:22:20,563 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:22:20,570 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:20,570 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:22:20,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:20,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:20,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:20,627 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 11:22:20,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:22:26,270 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:26,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379622715] [2021-05-06 11:22:26,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1379622715] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:26,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:26,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2021-05-06 11:22:26,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232092468] [2021-05-06 11:22:26,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 110 states [2021-05-06 11:22:26,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:26,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-05-06 11:22:26,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12358, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 11:22:26,272 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 110 states, 109 states have (on average 1.4678899082568808) internal successors, (160), 108 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:38,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:38,540 INFO L93 Difference]: Finished difference Result 176 states and 180 transitions. [2021-05-06 11:22:38,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-05-06 11:22:38,541 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 109 states have (on average 1.4678899082568808) internal successors, (160), 108 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-06 11:22:38,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:38,542 INFO L225 Difference]: With dead ends: 176 [2021-05-06 11:22:38,542 INFO L226 Difference]: Without dead ends: 168 [2021-05-06 11:22:38,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 43 SyntacticMatches, 11 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11007 ImplicationChecksByTransitivity, 11986.3ms TimeCoverageRelationStatistics Valid=787, Invalid=46085, Unknown=0, NotChecked=0, Total=46872 [2021-05-06 11:22:38,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-06 11:22:38,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2021-05-06 11:22:38,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:38,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-06 11:22:38,569 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 164 [2021-05-06 11:22:38,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:38,570 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-06 11:22:38,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 110 states, 109 states have (on average 1.4678899082568808) internal successors, (160), 108 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:38,570 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-06 11:22:38,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-06 11:22:38,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:38,572 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:38,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable489 [2021-05-06 11:22:38,572 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:38,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:38,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1621140525, now seen corresponding path program 98 times [2021-05-06 11:22:38,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:38,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573803770] [2021-05-06 11:22:38,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:38,579 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:22:38,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:22:38,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:22:38,600 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:22:38,607 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 11:22:38,609 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:22:38,621 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,622 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:22:38,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:22:38,647 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:22:38,664 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:38,664 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:22:38,667 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:22:38,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:22:38,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:22:38,703 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:22:38,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:38,723 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:22:38,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:38,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:22:38,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:22:38,752 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:22:38,760 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 11:22:38,761 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:22:38,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:38,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:38,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:38,817 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 11:22:38,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:22:38,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:22:44,310 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:44,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573803770] [2021-05-06 11:22:44,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [573803770] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:44,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:44,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [111] imperfect sequences [] total 111 [2021-05-06 11:22:44,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071895597] [2021-05-06 11:22:44,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 111 states [2021-05-06 11:22:44,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:44,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-05-06 11:22:44,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=12582, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:22:44,312 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 111 states, 110 states have (on average 1.4545454545454546) internal successors, (160), 109 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:57,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:57,034 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2021-05-06 11:22:57,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-06 11:22:57,034 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 110 states have (on average 1.4545454545454546) internal successors, (160), 109 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-06 11:22:57,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:57,035 INFO L225 Difference]: With dead ends: 174 [2021-05-06 11:22:57,035 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 11:22:57,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11145 ImplicationChecksByTransitivity, 12081.5ms TimeCoverageRelationStatistics Valid=793, Invalid=46949, Unknown=0, NotChecked=0, Total=47742 [2021-05-06 11:22:57,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 11:22:57,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2021-05-06 11:22:57,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.01840490797546) internal successors, (166), 163 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:57,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2021-05-06 11:22:57,064 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 164 [2021-05-06 11:22:57,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:57,064 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2021-05-06 11:22:57,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 111 states, 110 states have (on average 1.4545454545454546) internal successors, (160), 109 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:57,065 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2021-05-06 11:22:57,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:22:57,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:57,065 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 50, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:57,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable494 [2021-05-06 11:22:57,065 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:57,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:57,066 INFO L82 PathProgramCache]: Analyzing trace with hash 39548168, now seen corresponding path program 99 times [2021-05-06 11:22:57,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:57,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448965760] [2021-05-06 11:22:57,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:57,072 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:22:57,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:22:57,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:22:57,095 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:22:57,102 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:57,105 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:22:57,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:22:57,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:22:57,142 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:22:57,159 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:57,160 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:22:57,163 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:22:57,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:22:57,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:22:57,204 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:22:57,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:57,225 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:22:57,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:22:57,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:22:57,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:22:57,248 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:22:57,255 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:22:57,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:22:57,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:57,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:57,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:57,316 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 11:22:57,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:23:02,784 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:02,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448965760] [2021-05-06 11:23:02,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1448965760] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:02,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:02,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2021-05-06 11:23:02,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165301943] [2021-05-06 11:23:02,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2021-05-06 11:23:02,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:02,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-05-06 11:23:02,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=12591, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:23:02,785 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand has 112 states, 111 states have (on average 1.4684684684684686) internal successors, (163), 110 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:15,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:15,579 INFO L93 Difference]: Finished difference Result 179 states and 183 transitions. [2021-05-06 11:23:15,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-05-06 11:23:15,580 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 111 states have (on average 1.4684684684684686) internal successors, (163), 110 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 11:23:15,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:15,580 INFO L225 Difference]: With dead ends: 179 [2021-05-06 11:23:15,580 INFO L226 Difference]: Without dead ends: 171 [2021-05-06 11:23:15,582 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10885 ImplicationChecksByTransitivity, 12092.3ms TimeCoverageRelationStatistics Valid=782, Invalid=47398, Unknown=0, NotChecked=0, Total=48180 [2021-05-06 11:23:15,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-05-06 11:23:15,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 169. [2021-05-06 11:23:15,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:15,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-06 11:23:15,608 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 167 [2021-05-06 11:23:15,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:15,608 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-06 11:23:15,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 112 states, 111 states have (on average 1.4684684684684686) internal successors, (163), 110 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:15,608 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-06 11:23:15,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:23:15,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:15,608 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:15,608 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable499 [2021-05-06 11:23:15,609 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:15,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:15,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1814555530, now seen corresponding path program 100 times [2021-05-06 11:23:15,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:15,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857431302] [2021-05-06 11:23:15,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:15,614 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:23:15,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:23:15,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:23:15,635 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:23:15,642 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 11:23:15,644 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:23:15,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:23:15,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:23:15,679 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:23:15,695 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:15,696 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:23:15,698 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:23:15,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:23:15,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:23:15,732 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:23:15,749 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:15,752 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:23:15,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:15,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:23:15,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:23:15,775 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:23:15,781 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 11:23:15,782 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:23:15,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:15,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:15,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:15,836 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 11:23:15,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:23:21,620 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:21,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857431302] [2021-05-06 11:23:21,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [857431302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:21,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:21,620 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [113] imperfect sequences [] total 113 [2021-05-06 11:23:21,620 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472674893] [2021-05-06 11:23:21,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 113 states [2021-05-06 11:23:21,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:21,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-05-06 11:23:21,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=13035, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 11:23:21,621 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 113 states, 112 states have (on average 1.4553571428571428) internal successors, (163), 111 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:34,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:34,737 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2021-05-06 11:23:34,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-06 11:23:34,738 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 112 states have (on average 1.4553571428571428) internal successors, (163), 111 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 11:23:34,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:34,738 INFO L225 Difference]: With dead ends: 177 [2021-05-06 11:23:34,738 INFO L226 Difference]: Without dead ends: 172 [2021-05-06 11:23:34,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 46 SyntacticMatches, 9 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11593 ImplicationChecksByTransitivity, 12519.4ms TimeCoverageRelationStatistics Valid=807, Invalid=48699, Unknown=0, NotChecked=0, Total=49506 [2021-05-06 11:23:34,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-06 11:23:34,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2021-05-06 11:23:34,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:34,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2021-05-06 11:23:34,767 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 167 [2021-05-06 11:23:34,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:34,767 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2021-05-06 11:23:34,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 113 states, 112 states have (on average 1.4553571428571428) internal successors, (163), 111 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:34,767 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2021-05-06 11:23:34,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-06 11:23:34,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:34,768 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 51, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:34,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable504 [2021-05-06 11:23:34,768 INFO L428 AbstractCegarLoop]: === Iteration 105 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:34,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:34,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1780149109, now seen corresponding path program 101 times [2021-05-06 11:23:34,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:34,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676532150] [2021-05-06 11:23:34,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:34,774 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:23:34,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:23:34,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:23:34,795 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:23:34,802 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:34,804 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:23:34,816 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:23:34,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:23:34,842 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:23:34,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:34,860 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:23:34,862 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:23:34,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:23:34,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:23:34,903 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:23:34,921 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:34,925 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:23:34,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:34,947 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:23:34,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:23:34,951 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:23:34,958 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:34,958 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:23:34,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:35,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:35,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:35,021 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 11:23:35,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:23:35,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:23:41,427 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:41,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676532150] [2021-05-06 11:23:41,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1676532150] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:41,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:41,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2021-05-06 11:23:41,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325707072] [2021-05-06 11:23:41,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2021-05-06 11:23:41,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:41,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-05-06 11:23:41,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=13264, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:23:41,429 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand has 114 states, 113 states have (on average 1.4690265486725664) internal successors, (166), 112 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:54,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:54,648 INFO L93 Difference]: Finished difference Result 182 states and 186 transitions. [2021-05-06 11:23:54,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-05-06 11:23:54,648 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 113 states have (on average 1.4690265486725664) internal successors, (166), 112 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-06 11:23:54,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:54,653 INFO L225 Difference]: With dead ends: 182 [2021-05-06 11:23:54,653 INFO L226 Difference]: Without dead ends: 174 [2021-05-06 11:23:54,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 45 SyntacticMatches, 11 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11804 ImplicationChecksByTransitivity, 13170.4ms TimeCoverageRelationStatistics Valid=815, Invalid=49585, Unknown=0, NotChecked=0, Total=50400 [2021-05-06 11:23:54,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-06 11:23:54,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 172. [2021-05-06 11:23:54,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0179640718562875) internal successors, (170), 167 states have internal predecessors, (170), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:54,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 174 transitions. [2021-05-06 11:23:54,698 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 174 transitions. Word has length 170 [2021-05-06 11:23:54,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:54,698 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 174 transitions. [2021-05-06 11:23:54,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 114 states, 113 states have (on average 1.4690265486725664) internal successors, (166), 112 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:54,698 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 174 transitions. [2021-05-06 11:23:54,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-06 11:23:54,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:54,717 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:54,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable509 [2021-05-06 11:23:54,717 INFO L428 AbstractCegarLoop]: === Iteration 106 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:54,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:54,717 INFO L82 PathProgramCache]: Analyzing trace with hash -5141747, now seen corresponding path program 102 times [2021-05-06 11:23:54,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:54,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829019919] [2021-05-06 11:23:54,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:54,723 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:23:54,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:23:54,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:23:54,750 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:23:54,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:54,762 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:23:54,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,790 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:23:54,795 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:23:54,806 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:23:54,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:54,824 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:23:54,826 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:23:54,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,847 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:23:54,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:23:54,863 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:23:54,881 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:23:54,884 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:23:54,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:23:54,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:23:54,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:23:54,909 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:23:54,917 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 11:23:54,917 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:23:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:54,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:54,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:54,979 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 11:23:54,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:24:02,703 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:02,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829019919] [2021-05-06 11:24:02,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1829019919] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:02,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:02,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [115] imperfect sequences [] total 115 [2021-05-06 11:24:02,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930069792] [2021-05-06 11:24:02,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 115 states [2021-05-06 11:24:02,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:02,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-05-06 11:24:02,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=13548, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 11:24:02,704 INFO L87 Difference]: Start difference. First operand 172 states and 174 transitions. Second operand has 115 states, 114 states have (on average 1.456140350877193) internal successors, (166), 113 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:17,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:17,590 INFO L93 Difference]: Finished difference Result 180 states and 182 transitions. [2021-05-06 11:24:17,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-05-06 11:24:17,590 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 114 states have (on average 1.456140350877193) internal successors, (166), 113 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-06 11:24:17,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:17,591 INFO L225 Difference]: With dead ends: 180 [2021-05-06 11:24:17,591 INFO L226 Difference]: Without dead ends: 175 [2021-05-06 11:24:17,593 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 47 SyntacticMatches, 9 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8074 ImplicationChecksByTransitivity, 15988.9ms TimeCoverageRelationStatistics Valid=718, Invalid=50584, Unknown=0, NotChecked=0, Total=51302 [2021-05-06 11:24:17,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-05-06 11:24:17,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2021-05-06 11:24:17,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.017751479289941) internal successors, (172), 169 states have internal predecessors, (172), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:17,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 176 transitions. [2021-05-06 11:24:17,621 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 176 transitions. Word has length 170 [2021-05-06 11:24:17,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:17,621 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 176 transitions. [2021-05-06 11:24:17,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 115 states, 114 states have (on average 1.456140350877193) internal successors, (166), 113 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:17,621 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 176 transitions. [2021-05-06 11:24:17,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 11:24:17,622 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:17,622 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 52, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:17,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable514 [2021-05-06 11:24:17,622 INFO L428 AbstractCegarLoop]: === Iteration 107 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:17,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:17,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1304518104, now seen corresponding path program 103 times [2021-05-06 11:24:17,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:17,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626100645] [2021-05-06 11:24:17,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:17,628 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size [2021-05-06 11:24:17,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:24:17,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:24:17,648 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.5 percent of original size 69 [2021-05-06 11:24:17,654 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 11:24:17,657 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size [2021-05-06 11:24:17,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-05-06 11:24:17,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-05-06 11:24:17,696 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-05-06 11:24:17,713 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:17,714 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:24:17,716 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size [2021-05-06 11:24:17,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:24:17,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:24:17,757 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.8 percent of original size 67 [2021-05-06 11:24:17,776 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:17,780 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size [2021-05-06 11:24:17,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:17,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:24:17,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:24:17,806 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.1 percent of original size 64 [2021-05-06 11:24:17,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:17,814 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:24:17,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:17,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:17,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:17,877 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 11:24:17,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:24:24,741 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:24,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626100645] [2021-05-06 11:24:24,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1626100645] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:24,741 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:24,741 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2021-05-06 11:24:24,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739759359] [2021-05-06 11:24:24,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2021-05-06 11:24:24,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:24,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-05-06 11:24:24,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=13782, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:24:24,742 INFO L87 Difference]: Start difference. First operand 174 states and 176 transitions. Second operand has 116 states, 115 states have (on average 1.4695652173913043) internal successors, (169), 114 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)