/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:53:52,106 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:53:52,108 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:53:52,149 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:53:52,210 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:53:52,211 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:53:52,211 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:53:52,212 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 11:53:52,229 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:53:52,229 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:53:52,232 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:53:52,232 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:53:52,232 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:53:52,232 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:53:52,232 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:53:52,233 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:53:52,233 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:53:52,233 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:53:52,234 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:53:52,234 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:53:52,234 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:53:52,234 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:53:52,234 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:53:52,234 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:53:52,235 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:53:52,235 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:53:52,235 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:53:52,235 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:53:52,235 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:53:52,235 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:53:52,235 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:53:52,236 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:53:52,540 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:53:52,563 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:53:52,565 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:53:52,566 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:53:52,567 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:53:52,567 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c [2021-05-06 11:53:52,620 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/33d3912cd/88b6340c9c5c489599e4d7f26e8ecaa2/FLAG818e5e302 [2021-05-06 11:53:53,052 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:53:53,052 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c [2021-05-06 11:53:53,057 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/33d3912cd/88b6340c9c5c489599e4d7f26e8ecaa2/FLAG818e5e302 [2021-05-06 11:53:53,464 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/33d3912cd/88b6340c9c5c489599e4d7f26e8ecaa2 [2021-05-06 11:53:53,467 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:53:53,468 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:53:53,471 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:53:53,472 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:53:53,475 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:53:53,476 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,476 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c006e08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53, skipping insertion in model container [2021-05-06 11:53:53,477 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,482 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:53:53,493 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:53:53,586 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c[318,331] [2021-05-06 11:53:53,605 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:53:53,612 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:53:53,657 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_1.c[318,331] [2021-05-06 11:53:53,660 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:53:53,680 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:53:53,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53 WrapperNode [2021-05-06 11:53:53,682 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:53:53,683 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:53:53,684 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:53:53,684 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:53:53,693 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,693 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,698 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,712 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,715 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,716 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (1/1) ... [2021-05-06 11:53:53,717 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:53:53,718 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:53:53,718 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:53:53,718 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:53:53,719 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (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 11:53:53,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:53:53,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:53:53,789 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:53:53,789 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:53:53,790 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:53:53,790 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:53:53,790 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:53:53,790 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:53:53,791 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:53:53,791 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:53:53,791 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:53:53,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:53:53,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:53:53,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:53:53,792 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:53:53,792 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:53:53,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:53:54,059 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:53:54,060 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:53:54,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:53:54 BoogieIcfgContainer [2021-05-06 11:53:54,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:53:54,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:53:54,062 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:53:54,064 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:53:54,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:53:53" (1/3) ... [2021-05-06 11:53:54,065 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cc090ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:53:54, skipping insertion in model container [2021-05-06 11:53:54,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:53:53" (2/3) ... [2021-05-06 11:53:54,066 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cc090ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:53:54, skipping insertion in model container [2021-05-06 11:53:54,066 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:53:54" (3/3) ... [2021-05-06 11:53:54,067 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_1.c [2021-05-06 11:53:54,072 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:53:54,088 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:53:54,117 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:53:54,133 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:53:54,133 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:53:54,133 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:53:54,133 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:53:54,133 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:53:54,133 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:53:54,133 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:53:54,134 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:53:54,144 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 11:53:54,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:53:54,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:54,151 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:54,151 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:54,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:54,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 1 times [2021-05-06 11:53:54,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:54,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381899595] [2021-05-06 11:53:54,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:54,215 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:53:54,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:54,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:54,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:54,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:54,439 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:54,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381899595] [2021-05-06 11:53:54,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1381899595] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:54,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:54,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:53:54,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69867299] [2021-05-06 11:53:54,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:53:54,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:54,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:53:54,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:53:54,461 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:54,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:54,552 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-06 11:53:54,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:53:54,554 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 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 12 [2021-05-06 11:53:54,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:54,559 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:53:54,559 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:53:54,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 69.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:53:54,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:53:54,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:53:54,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 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 11:53:54,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-05-06 11:53:54,595 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2021-05-06 11:53:54,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:54,596 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-05-06 11:53:54,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:54,597 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-05-06 11:53:54,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:53:54,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:54,598 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:54,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:53:54,598 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:54,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:54,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 1 times [2021-05-06 11:53:54,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:54,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286381512] [2021-05-06 11:53:54,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:54,609 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:53:54,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:54,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:54,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:54,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:54,740 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:54,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286381512] [2021-05-06 11:53:54,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [286381512] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:54,741 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:54,741 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:53:54,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182745107] [2021-05-06 11:53:54,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:53:54,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:54,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:53:54,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:53:54,743 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:54,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:54,839 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-05-06 11:53:54,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:53:54,840 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 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 12 [2021-05-06 11:53:54,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:54,841 INFO L225 Difference]: With dead ends: 24 [2021-05-06 11:53:54,841 INFO L226 Difference]: Without dead ends: 16 [2021-05-06 11:53:54,842 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 79.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:53:54,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-06 11:53:54,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-06 11:53:54,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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 11:53:54,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-06 11:53:54,848 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2021-05-06 11:53:54,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:54,848 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-06 11:53:54,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:54,849 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-06 11:53:54,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:53:54,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:54,849 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:54,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:53:54,850 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:54,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:54,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1316432198, now seen corresponding path program 1 times [2021-05-06 11:53:54,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:54,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195664909] [2021-05-06 11:53:54,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:54,891 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:53:54,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:54,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:54,928 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:53:54,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:54,945 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:53:54,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:54,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:54,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:55,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:55,040 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:55,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195664909] [2021-05-06 11:53:55,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [195664909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:55,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:55,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:53:55,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750843549] [2021-05-06 11:53:55,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:53:55,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:55,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:53:55,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:53:55,043 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 11:53:55,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:55,178 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-05-06 11:53:55,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:53:55,178 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 11:53:55,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:55,179 INFO L225 Difference]: With dead ends: 26 [2021-05-06 11:53:55,179 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:53:55,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 131.6ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:53:55,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:53:55,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 11:53:55,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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 11:53:55,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-06 11:53:55,185 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2021-05-06 11:53:55,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:55,186 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-06 11:53:55,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 11:53:55,186 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-06 11:53:55,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:53:55,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:55,187 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:55,187 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:53:55,187 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:55,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:55,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1342594849, now seen corresponding path program 1 times [2021-05-06 11:53:55,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:55,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103019467] [2021-05-06 11:53:55,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:55,215 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:55,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:55,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:55,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:55,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:55,308 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:55,332 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:55,352 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:53:55,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:55,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:55,397 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:53:55,409 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:55,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:55,428 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:53:55,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:55,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:55,468 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:53:55,482 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:55,492 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:55,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:55,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:55,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:55,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:55,548 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:55,568 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:55,573 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:55,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:55,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:55,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:55,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:55,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:55,920 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:55,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103019467] [2021-05-06 11:53:55,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [103019467] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:55,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:55,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:53:55,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507502212] [2021-05-06 11:53:55,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:53:55,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:55,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:53:55,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:53:55,923 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:56,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:56,227 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-06 11:53:56,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:53:56,227 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 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 19 [2021-05-06 11:53:56,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:56,237 INFO L225 Difference]: With dead ends: 39 [2021-05-06 11:53:56,237 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:53:56,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 372.6ms TimeCoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:53:56,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:53:56,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 11:53:56,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 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 11:53:56,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-05-06 11:53:56,249 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2021-05-06 11:53:56,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:56,249 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-05-06 11:53:56,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:56,250 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-05-06 11:53:56,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 11:53:56,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:56,251 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:56,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:53:56,251 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:56,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:56,252 INFO L82 PathProgramCache]: Analyzing trace with hash -510493847, now seen corresponding path program 2 times [2021-05-06 11:53:56,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:56,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137193043] [2021-05-06 11:53:56,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:56,268 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:56,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:56,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:56,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:56,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:56,329 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:56,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:56,358 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:53:56,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:56,376 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:56,387 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:53:56,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:56,398 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:56,403 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:53:56,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:56,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:56,423 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:53:56,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:56,442 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:56,443 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:56,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:56,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:56,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:56,489 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:56,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:56,510 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:56,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:56,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:56,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:56,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:56,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:56,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:56,689 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:56,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137193043] [2021-05-06 11:53:56,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2137193043] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:56,690 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:56,690 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:53:56,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590235945] [2021-05-06 11:53:56,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:53:56,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:56,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:53:56,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:53:56,693 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:57,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:57,045 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-05-06 11:53:57,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:53:57,045 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 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 22 [2021-05-06 11:53:57,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:57,046 INFO L225 Difference]: With dead ends: 47 [2021-05-06 11:53:57,046 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 11:53:57,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 344.3ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:53:57,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 11:53:57,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2021-05-06 11:53:57,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 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 11:53:57,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-05-06 11:53:57,053 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 22 [2021-05-06 11:53:57,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:57,053 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-05-06 11:53:57,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:57,054 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-05-06 11:53:57,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 11:53:57,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:57,054 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:57,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:53:57,054 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:57,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:57,055 INFO L82 PathProgramCache]: Analyzing trace with hash 969620496, now seen corresponding path program 3 times [2021-05-06 11:53:57,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:57,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [840543146] [2021-05-06 11:53:57,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:57,066 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:57,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:57,087 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:57,100 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:57,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:57,115 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:57,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:57,138 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:53:57,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:57,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:57,157 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:53:57,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:57,170 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:57,173 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:53:57,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:57,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:57,192 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:53:57,201 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:57,210 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:57,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:57,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:57,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:57,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:57,266 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:57,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:57,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:57,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:57,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:57,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:57,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:57,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:57,553 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:57,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [840543146] [2021-05-06 11:53:57,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [840543146] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:57,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:57,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:53:57,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640080499] [2021-05-06 11:53:57,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:53:57,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:57,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:53:57,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:53:57,556 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:58,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:58,032 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2021-05-06 11:53:58,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:53:58,032 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 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 27 [2021-05-06 11:53:58,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:58,033 INFO L225 Difference]: With dead ends: 61 [2021-05-06 11:53:58,033 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 11:53:58,034 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 516.8ms TimeCoverageRelationStatistics Valid=204, Invalid=552, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:53:58,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 11:53:58,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-06 11:53:58,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 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 11:53:58,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-05-06 11:53:58,043 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 27 [2021-05-06 11:53:58,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:58,043 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-05-06 11:53:58,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:58,043 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-05-06 11:53:58,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 11:53:58,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:58,044 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:58,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:53:58,044 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:58,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:58,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1271041704, now seen corresponding path program 4 times [2021-05-06 11:53:58,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:58,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786506264] [2021-05-06 11:53:58,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:58,055 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:58,080 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:58,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:58,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:58,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:58,114 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:58,131 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:58,138 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:53:58,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:58,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:58,158 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:53:58,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:58,168 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:58,171 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:53:58,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:58,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:58,191 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:53:58,200 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:58,210 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:58,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:58,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:58,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:58,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:58,255 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:58,276 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:58,279 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:58,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:58,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:58,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:58,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:58,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:58,615 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:58,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786506264] [2021-05-06 11:53:58,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1786506264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:58,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:58,616 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:53:58,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210717832] [2021-05-06 11:53:58,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:53:58,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:58,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:53:58,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:53:58,617 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 16 states, 16 states have (on average 1.625) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:59,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:59,165 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-05-06 11:53:59,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:53:59,166 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.625) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (3), 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 30 [2021-05-06 11:53:59,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:59,167 INFO L225 Difference]: With dead ends: 65 [2021-05-06 11:53:59,167 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 11:53:59,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 618.9ms TimeCoverageRelationStatistics Valid=268, Invalid=724, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:53:59,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 11:53:59,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-06 11:53:59,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 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 11:53:59,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-06 11:53:59,176 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 30 [2021-05-06 11:53:59,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:59,176 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-06 11:53:59,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.625) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:59,177 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-06 11:53:59,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:53:59,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:59,177 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:59,178 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:53:59,178 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:59,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:59,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1699044070, now seen corresponding path program 5 times [2021-05-06 11:53:59,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:59,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856339729] [2021-05-06 11:53:59,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:59,189 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:59,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:59,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:59,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:59,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:59,235 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:59,252 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:59,256 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:53:59,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:59,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:59,275 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:53:59,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:59,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:59,287 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:53:59,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:59,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:53:59,305 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:53:59,314 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:59,329 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:53:59,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:59,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:59,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:53:59,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:53:59,380 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:53:59,397 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:53:59,398 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:59,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:59,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:59,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:59,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:59,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:59,700 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:59,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856339729] [2021-05-06 11:53:59,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1856339729] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:59,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:59,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:53:59,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391486658] [2021-05-06 11:53:59,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:53:59,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:59,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:53:59,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=287, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:53:59,702 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:00,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:00,327 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2021-05-06 11:54:00,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:54:00,328 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (3), 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 33 [2021-05-06 11:54:00,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:00,328 INFO L225 Difference]: With dead ends: 69 [2021-05-06 11:54:00,328 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:54:00,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 657.4ms TimeCoverageRelationStatistics Valid=341, Invalid=919, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:54:00,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:54:00,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-06 11:54:00,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.119047619047619) internal successors, (47), 42 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 11:54:00,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-05-06 11:54:00,337 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 33 [2021-05-06 11:54:00,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:00,337 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-05-06 11:54:00,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:00,337 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-05-06 11:54:00,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 11:54:00,338 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:00,338 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:00,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:54:00,338 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:00,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:00,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1018713474, now seen corresponding path program 6 times [2021-05-06 11:54:00,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:00,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38951508] [2021-05-06 11:54:00,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:00,347 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:00,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:00,366 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:00,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:00,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:00,387 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:00,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:00,410 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:00,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:00,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:00,434 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:00,441 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:00,442 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:00,445 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:00,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:00,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:00,465 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:00,474 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:00,479 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:00,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:00,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:00,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:00,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:00,522 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:00,544 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:00,549 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:00,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:00,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:00,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:00,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:00,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:00,906 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:00,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38951508] [2021-05-06 11:54:00,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [38951508] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:00,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:00,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:54:00,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418074796] [2021-05-06 11:54:00,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:54:00,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:00,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:54:00,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=344, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:54:00,908 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 20 states, 20 states have (on average 1.6) internal successors, (32), 19 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:01,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:01,647 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2021-05-06 11:54:01,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:54:01,647 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.6) internal successors, (32), 19 states have internal predecessors, (32), 2 states have call successors, (3), 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 36 [2021-05-06 11:54:01,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:01,648 INFO L225 Difference]: With dead ends: 73 [2021-05-06 11:54:01,649 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 11:54:01,650 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 762.1ms TimeCoverageRelationStatistics Valid=423, Invalid=1137, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:54:01,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 11:54:01,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-06 11:54:01,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 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 11:54:01,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-05-06 11:54:01,657 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 36 [2021-05-06 11:54:01,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:01,658 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-05-06 11:54:01,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.6) internal successors, (32), 19 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:01,658 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-05-06 11:54:01,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:54:01,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:01,659 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:01,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:54:01,659 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:01,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:01,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1339954244, now seen corresponding path program 7 times [2021-05-06 11:54:01,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:01,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133583519] [2021-05-06 11:54:01,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:01,668 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:01,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:01,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:01,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:01,683 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:01,707 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:01,724 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:01,728 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:01,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:01,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:01,743 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:01,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:01,752 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:01,761 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:01,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:01,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:01,792 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:01,801 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:01,806 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:01,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:01,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:01,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:01,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:01,846 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:01,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:01,861 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:01,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:02,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:02,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:02,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:02,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:02,215 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:02,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133583519] [2021-05-06 11:54:02,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [133583519] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:02,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:02,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:54:02,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15037583] [2021-05-06 11:54:02,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:54:02,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:02,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:54:02,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=393, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:54:02,217 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:02,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:02,951 INFO L93 Difference]: Finished difference Result 77 states and 87 transitions. [2021-05-06 11:54:02,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:54:02,951 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 states have internal predecessors, (35), 2 states have call successors, (3), 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 39 [2021-05-06 11:54:02,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:02,952 INFO L225 Difference]: With dead ends: 77 [2021-05-06 11:54:02,952 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:54:02,953 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 814.9ms TimeCoverageRelationStatistics Valid=540, Invalid=1352, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:54:02,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:54:02,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 11:54:02,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 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 11:54:02,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-05-06 11:54:02,960 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 39 [2021-05-06 11:54:02,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:02,960 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-05-06 11:54:02,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:02,961 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-05-06 11:54:02,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 11:54:02,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:02,961 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:02,962 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:54:02,962 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:02,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:02,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1137715284, now seen corresponding path program 8 times [2021-05-06 11:54:02,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:02,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217021783] [2021-05-06 11:54:02,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:02,970 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:02,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:02,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:02,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:02,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:03,010 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:03,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:03,032 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:03,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:03,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:03,047 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:03,056 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:03,057 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:03,059 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:03,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:03,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:03,078 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:03,087 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:03,092 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:03,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:03,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:03,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:03,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:03,137 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:03,151 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:03,152 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:03,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:03,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:03,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:03,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:03,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:03,562 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:03,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217021783] [2021-05-06 11:54:03,562 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [217021783] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:03,562 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:03,562 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:54:03,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059460627] [2021-05-06 11:54:03,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:54:03,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:03,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:54:03,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:54:03,564 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 24 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 23 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:04,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:04,378 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-05-06 11:54:04,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:54:04,380 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 23 states have internal predecessors, (38), 2 states have call successors, (3), 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 42 [2021-05-06 11:54:04,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:04,380 INFO L225 Difference]: With dead ends: 81 [2021-05-06 11:54:04,380 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 11:54:04,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 886.7ms TimeCoverageRelationStatistics Valid=642, Invalid=1614, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:54:04,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 11:54:04,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-06 11:54:04,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 51 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 11:54:04,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-05-06 11:54:04,389 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 42 [2021-05-06 11:54:04,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:04,389 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-05-06 11:54:04,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 23 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:04,389 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-05-06 11:54:04,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 11:54:04,390 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:04,390 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:04,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:54:04,390 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:04,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:04,391 INFO L82 PathProgramCache]: Analyzing trace with hash 504549010, now seen corresponding path program 9 times [2021-05-06 11:54:04,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:04,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222059639] [2021-05-06 11:54:04,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:04,399 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:04,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:04,402 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:04,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:04,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:04,440 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:04,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:04,460 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:04,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:04,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:04,475 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:04,482 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:04,483 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:04,490 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:04,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:04,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:04,517 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:04,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:04,535 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:04,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:04,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:04,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:04,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:04,577 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:04,591 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:04,593 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:04,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:04,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:04,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:04,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:04,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:05,122 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:05,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222059639] [2021-05-06 11:54:05,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [222059639] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:05,122 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:05,122 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:54:05,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670825757] [2021-05-06 11:54:05,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:54:05,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:05,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:54:05,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:54:05,123 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:05,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:05,959 INFO L93 Difference]: Finished difference Result 84 states and 93 transitions. [2021-05-06 11:54:05,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:54:05,960 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 2 states have call successors, (3), 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 45 [2021-05-06 11:54:05,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:05,960 INFO L225 Difference]: With dead ends: 84 [2021-05-06 11:54:05,960 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 11:54:05,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 875.1ms TimeCoverageRelationStatistics Valid=189, Invalid=1533, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:54:05,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 11:54:05,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-06 11:54:05,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 53 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 11:54:05,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-06 11:54:05,969 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 45 [2021-05-06 11:54:05,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:05,969 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-06 11:54:05,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:05,970 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-06 11:54:05,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:54:05,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:05,970 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:05,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:54:05,971 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:05,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:05,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1953083091, now seen corresponding path program 10 times [2021-05-06 11:54:05,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:05,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788645194] [2021-05-06 11:54:05,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:05,979 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:05,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:05,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:05,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:05,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:06,028 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:06,045 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:06,055 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:06,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:06,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:06,072 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:06,081 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:06,082 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:06,085 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:06,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:06,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:06,102 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:06,110 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:06,115 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:06,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:06,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:06,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:06,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:06,162 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:06,180 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:06,183 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:06,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:06,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:06,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:06,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:06,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:06,671 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:06,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788645194] [2021-05-06 11:54:06,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1788645194] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:06,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:06,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:54:06,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544156087] [2021-05-06 11:54:06,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:54:06,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:06,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:54:06,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=590, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:54:06,673 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 26 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 11:54:07,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:07,615 INFO L93 Difference]: Finished difference Result 87 states and 97 transitions. [2021-05-06 11:54:07,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:54:07,616 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 26 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 11:54:07,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:07,617 INFO L225 Difference]: With dead ends: 87 [2021-05-06 11:54:07,617 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 11:54:07,618 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 830 ImplicationChecksByTransitivity, 1041.6ms TimeCoverageRelationStatistics Valid=761, Invalid=2101, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:54:07,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 11:54:07,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-06 11:54:07,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 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 11:54:07,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2021-05-06 11:54:07,625 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 47 [2021-05-06 11:54:07,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:07,626 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2021-05-06 11:54:07,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 26 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 11:54:07,626 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2021-05-06 11:54:07,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:54:07,627 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:07,627 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:07,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:54:07,627 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:07,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:07,627 INFO L82 PathProgramCache]: Analyzing trace with hash 609078107, now seen corresponding path program 11 times [2021-05-06 11:54:07,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:07,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327146172] [2021-05-06 11:54:07,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:07,635 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:07,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:07,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:07,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:07,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:07,675 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:07,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:07,697 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:07,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:07,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:07,714 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:07,721 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:07,722 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:07,724 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:07,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:07,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:07,739 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:07,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:07,750 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:07,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:07,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:07,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:07,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:07,798 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:07,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:07,814 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:07,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:07,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:07,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:07,975 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 11:54:07,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:07,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:08,232 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:08,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327146172] [2021-05-06 11:54:08,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [327146172] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:08,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:08,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:54:08,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513456894] [2021-05-06 11:54:08,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:54:08,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:08,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:54:08,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=523, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:54:08,234 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 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 11:54:09,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:09,304 INFO L93 Difference]: Finished difference Result 109 states and 137 transitions. [2021-05-06 11:54:09,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:54:09,305 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 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 11:54:09,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:09,305 INFO L225 Difference]: With dead ends: 109 [2021-05-06 11:54:09,305 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 11:54:09,306 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 1134.2ms TimeCoverageRelationStatistics Valid=861, Invalid=2109, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:54:09,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 11:54:09,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 56. [2021-05-06 11:54:09,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 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 11:54:09,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2021-05-06 11:54:09,314 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 50 [2021-05-06 11:54:09,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:09,314 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2021-05-06 11:54:09,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 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 11:54:09,314 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2021-05-06 11:54:09,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:54:09,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:09,315 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:09,315 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:54:09,315 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:09,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:09,315 INFO L82 PathProgramCache]: Analyzing trace with hash 412777822, now seen corresponding path program 12 times [2021-05-06 11:54:09,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:09,316 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470488139] [2021-05-06 11:54:09,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:09,323 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:09,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:09,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:09,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:09,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:09,362 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:09,376 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:09,380 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:09,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:09,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:09,406 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:09,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:09,417 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:09,420 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:09,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:09,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:09,437 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:09,445 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:09,449 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:09,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:09,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:09,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:09,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:09,497 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:09,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:09,516 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:09,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:09,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:09,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:09,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:09,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:09,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:10,038 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:10,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470488139] [2021-05-06 11:54:10,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1470488139] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:10,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:10,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:54:10,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92002835] [2021-05-06 11:54:10,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:54:10,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:10,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:54:10,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=678, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:54:10,040 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 32 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:11,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:11,392 INFO L93 Difference]: Finished difference Result 110 states and 122 transitions. [2021-05-06 11:54:11,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:54:11,392 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 32 states have internal predecessors, (51), 2 states have call successors, (3), 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 55 [2021-05-06 11:54:11,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:11,393 INFO L225 Difference]: With dead ends: 110 [2021-05-06 11:54:11,393 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 11:54:11,394 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 1436.8ms TimeCoverageRelationStatistics Valid=1128, Invalid=2778, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:54:11,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 11:54:11,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-06 11:54:11,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 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 11:54:11,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2021-05-06 11:54:11,409 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 55 [2021-05-06 11:54:11,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:11,412 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2021-05-06 11:54:11,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 32 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:11,412 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2021-05-06 11:54:11,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:54:11,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:11,415 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:11,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:54:11,415 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:11,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:11,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1284516940, now seen corresponding path program 13 times [2021-05-06 11:54:11,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:11,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1035600976] [2021-05-06 11:54:11,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:11,428 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:11,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:11,448 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:11,456 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:11,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:11,466 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:11,480 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:11,483 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:11,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:11,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:11,496 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:11,503 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:11,504 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:11,511 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:11,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:11,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:11,526 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:11,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:11,541 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:11,542 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:11,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:11,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:11,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:11,584 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:11,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:11,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:11,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:11,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:11,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:11,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:11,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:12,213 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:12,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1035600976] [2021-05-06 11:54:12,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1035600976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:12,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:12,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:54:12,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081426672] [2021-05-06 11:54:12,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:54:12,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:12,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:54:12,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=978, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:54:12,215 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:13,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:13,704 INFO L93 Difference]: Finished difference Result 153 states and 164 transitions. [2021-05-06 11:54:13,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:54:13,705 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (3), 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 61 [2021-05-06 11:54:13,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:13,707 INFO L225 Difference]: With dead ends: 153 [2021-05-06 11:54:13,707 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 11:54:13,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1520 ImplicationChecksByTransitivity, 1592.1ms TimeCoverageRelationStatistics Valid=1391, Invalid=3721, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:54:13,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 11:54:13,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 11:54:13,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.053191489361702) internal successors, (99), 94 states have internal predecessors, (99), 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 11:54:13,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2021-05-06 11:54:13,724 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 61 [2021-05-06 11:54:13,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:13,724 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2021-05-06 11:54:13,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:13,724 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2021-05-06 11:54:13,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:54:13,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:13,727 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:13,727 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:54:13,727 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:13,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:13,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1095922444, now seen corresponding path program 14 times [2021-05-06 11:54:13,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:13,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587897887] [2021-05-06 11:54:13,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:13,738 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:13,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:13,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:13,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:13,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:13,776 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:13,791 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:13,793 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:13,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:13,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:13,806 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:13,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:13,814 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:13,829 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:13,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:13,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:13,845 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:13,852 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:13,855 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:13,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:13,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:13,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:13,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:13,886 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:13,899 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:13,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:13,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:14,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:14,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:14,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:14,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:14,543 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:14,543 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587897887] [2021-05-06 11:54:14,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [587897887] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:14,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:14,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:54:14,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452156446] [2021-05-06 11:54:14,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:54:14,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:14,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:54:14,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=1102, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:54:14,545 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand has 38 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 37 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:16,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:16,103 INFO L93 Difference]: Finished difference Result 157 states and 167 transitions. [2021-05-06 11:54:16,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:54:16,103 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 37 states have internal predecessors, (60), 2 states have call successors, (3), 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 64 [2021-05-06 11:54:16,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:16,104 INFO L225 Difference]: With dead ends: 157 [2021-05-06 11:54:16,104 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 11:54:16,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1695 ImplicationChecksByTransitivity, 1651.3ms TimeCoverageRelationStatistics Valid=1509, Invalid=4191, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:54:16,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 11:54:16,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2021-05-06 11:54:16,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.0515463917525774) internal successors, (102), 97 states have internal predecessors, (102), 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 11:54:16,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2021-05-06 11:54:16,117 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 64 [2021-05-06 11:54:16,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:16,117 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2021-05-06 11:54:16,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.5789473684210527) internal successors, (60), 37 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:16,117 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2021-05-06 11:54:16,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:54:16,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:16,118 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:16,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:54:16,118 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:16,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:16,118 INFO L82 PathProgramCache]: Analyzing trace with hash -194151414, now seen corresponding path program 15 times [2021-05-06 11:54:16,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:16,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067951996] [2021-05-06 11:54:16,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:16,126 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:16,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:16,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:16,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:16,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:16,158 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:16,172 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:16,177 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:16,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:16,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:16,190 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:16,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:16,197 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:16,200 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:16,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:16,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:16,214 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:16,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:16,225 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:16,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:16,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:16,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:16,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:16,272 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:16,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:16,287 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:16,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:16,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:16,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:16,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:16,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:17,063 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:17,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067951996] [2021-05-06 11:54:17,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2067951996] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:17,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:17,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:54:17,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36445486] [2021-05-06 11:54:17,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:54:17,064 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:17,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:54:17,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1575, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:54:17,065 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand has 40 states, 40 states have (on average 1.575) internal successors, (63), 39 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:18,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:18,664 INFO L93 Difference]: Finished difference Result 160 states and 169 transitions. [2021-05-06 11:54:18,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:54:18,665 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 39 states have internal predecessors, (63), 2 states have call successors, (3), 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 67 [2021-05-06 11:54:18,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:18,665 INFO L225 Difference]: With dead ends: 160 [2021-05-06 11:54:18,666 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:54:18,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 1544.5ms TimeCoverageRelationStatistics Valid=340, Invalid=3692, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:54:18,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:54:18,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-05-06 11:54:18,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0505050505050506) internal successors, (104), 99 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 11:54:18,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2021-05-06 11:54:18,676 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 67 [2021-05-06 11:54:18,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:18,676 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2021-05-06 11:54:18,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 39 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:18,677 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2021-05-06 11:54:18,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:54:18,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:18,677 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:18,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:54:18,677 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:18,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:18,678 INFO L82 PathProgramCache]: Analyzing trace with hash 696993893, now seen corresponding path program 16 times [2021-05-06 11:54:18,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:18,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033618459] [2021-05-06 11:54:18,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:18,686 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:18,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:18,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:18,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:18,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:18,717 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:18,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:18,749 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:18,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:18,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:18,764 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:18,771 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:18,772 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:18,775 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:18,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:18,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:18,788 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:18,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:18,799 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:18,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:18,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:18,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:18,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:18,850 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:18,869 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:18,870 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:18,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:19,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:19,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:19,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:19,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:19,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:19,525 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:19,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033618459] [2021-05-06 11:54:19,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2033618459] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:19,526 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:19,526 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:54:19,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731890665] [2021-05-06 11:54:19,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:54:19,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:19,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:54:19,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=572, Invalid=1068, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:54:19,528 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 40 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:21,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:21,212 INFO L93 Difference]: Finished difference Result 171 states and 189 transitions. [2021-05-06 11:54:21,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:54:21,212 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 40 states have internal predecessors, (65), 2 states have call successors, (3), 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 69 [2021-05-06 11:54:21,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:21,213 INFO L225 Difference]: With dead ends: 171 [2021-05-06 11:54:21,213 INFO L226 Difference]: Without dead ends: 115 [2021-05-06 11:54:21,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1729 ImplicationChecksByTransitivity, 1791.5ms TimeCoverageRelationStatistics Valid=1710, Invalid=4452, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:54:21,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-06 11:54:21,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 75. [2021-05-06 11:54:21,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 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 11:54:21,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2021-05-06 11:54:21,222 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 69 [2021-05-06 11:54:21,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:21,222 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2021-05-06 11:54:21,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 40 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:21,222 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2021-05-06 11:54:21,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:54:21,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:21,222 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:21,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:54:21,223 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:21,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:21,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1838075368, now seen corresponding path program 17 times [2021-05-06 11:54:21,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:21,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897184879] [2021-05-06 11:54:21,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:21,235 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:21,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:21,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:21,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:21,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:21,273 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:21,287 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:21,293 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:21,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:21,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:21,306 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:21,313 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:21,316 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:21,317 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:21,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:21,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:21,330 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:21,337 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:21,341 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:21,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:21,343 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:21,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:21,355 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:21,373 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:21,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:21,388 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:21,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:21,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:21,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:21,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:21,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:22,184 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:22,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897184879] [2021-05-06 11:54:22,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [897184879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:22,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:22,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:54:22,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339538203] [2021-05-06 11:54:22,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:54:22,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:22,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:54:22,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=697, Invalid=1465, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:54:22,186 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 43 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 11:54:24,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:24,154 INFO L93 Difference]: Finished difference Result 189 states and 200 transitions. [2021-05-06 11:54:24,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:54:24,155 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 43 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 11:54:24,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:24,155 INFO L225 Difference]: With dead ends: 189 [2021-05-06 11:54:24,155 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 11:54:24,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2280 ImplicationChecksByTransitivity, 2090.1ms TimeCoverageRelationStatistics Valid=1974, Invalid=5682, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:54:24,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 11:54:24,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-05-06 11:54:24,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0427350427350428) internal successors, (122), 117 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 11:54:24,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-05-06 11:54:24,169 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 74 [2021-05-06 11:54:24,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:24,169 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-05-06 11:54:24,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 43 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 11:54:24,169 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-05-06 11:54:24,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:54:24,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:24,170 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:24,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:54:24,170 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:24,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:24,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1263432662, now seen corresponding path program 18 times [2021-05-06 11:54:24,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:24,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554305113] [2021-05-06 11:54:24,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:24,178 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:24,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:24,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:24,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:24,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:24,220 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:24,236 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:24,240 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:24,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:24,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:24,265 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:24,274 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:24,275 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:24,277 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:24,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:24,282 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:24,293 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:24,301 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:24,306 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:24,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:24,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:24,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:24,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:24,346 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:24,362 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:24,364 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:24,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:24,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:24,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:24,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:24,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:25,420 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:25,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554305113] [2021-05-06 11:54:25,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [554305113] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:25,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:25,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:54:25,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685134369] [2021-05-06 11:54:25,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:54:25,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:25,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:54:25,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=2072, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:54:25,422 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 45 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 11:54:27,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:27,476 INFO L93 Difference]: Finished difference Result 192 states and 201 transitions. [2021-05-06 11:54:27,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:54:27,477 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 45 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 11:54:27,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:27,477 INFO L225 Difference]: With dead ends: 192 [2021-05-06 11:54:27,477 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 11:54:27,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 965 ImplicationChecksByTransitivity, 1976.9ms TimeCoverageRelationStatistics Valid=409, Invalid=4993, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:54:27,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 11:54:27,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-05-06 11:54:27,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0420168067226891) internal successors, (124), 119 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 11:54:27,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2021-05-06 11:54:27,489 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 77 [2021-05-06 11:54:27,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:27,489 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2021-05-06 11:54:27,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 45 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 11:54:27,489 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2021-05-06 11:54:27,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:54:27,490 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:27,490 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:27,490 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:54:27,490 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:27,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:27,490 INFO L82 PathProgramCache]: Analyzing trace with hash -1410807183, now seen corresponding path program 19 times [2021-05-06 11:54:27,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:27,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920666566] [2021-05-06 11:54:27,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:27,512 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:27,526 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:27,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:27,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:27,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:27,547 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:27,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:27,564 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:27,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:27,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:27,577 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:27,584 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:27,585 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:27,591 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:27,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:27,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:27,604 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:27,612 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:27,631 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:27,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:27,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:27,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:27,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:27,675 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:27,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:27,693 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:27,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:27,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:27,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:27,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:27,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:28,527 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:28,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920666566] [2021-05-06 11:54:28,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1920666566] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:28,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:28,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:54:28,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742564477] [2021-05-06 11:54:28,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:54:28,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:28,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:54:28,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=1666, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:54:28,529 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:30,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:30,826 INFO L93 Difference]: Finished difference Result 195 states and 205 transitions. [2021-05-06 11:54:30,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:54:30,828 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 2 states have call successors, (3), 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 79 [2021-05-06 11:54:30,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:30,828 INFO L225 Difference]: With dead ends: 195 [2021-05-06 11:54:30,828 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 11:54:30,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2604 ImplicationChecksByTransitivity, 2315.0ms TimeCoverageRelationStatistics Valid=2229, Invalid=6513, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:54:30,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 11:54:30,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 11:54:30,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.040983606557377) internal successors, (127), 122 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 11:54:30,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2021-05-06 11:54:30,844 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 79 [2021-05-06 11:54:30,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:30,844 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2021-05-06 11:54:30,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:30,844 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2021-05-06 11:54:30,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 11:54:30,845 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:30,845 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:30,845 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:54:30,845 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:30,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:30,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1680660841, now seen corresponding path program 20 times [2021-05-06 11:54:30,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:30,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058464830] [2021-05-06 11:54:30,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:30,854 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:30,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:30,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:30,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:30,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:30,893 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:30,910 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:30,915 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:30,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:30,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:30,931 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:30,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:30,941 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:30,944 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:30,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:30,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:30,959 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:30,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:30,969 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:30,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:30,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:30,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:30,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:31,006 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:31,020 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:31,021 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:31,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:31,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:31,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:31,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:31,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:31,967 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:31,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058464830] [2021-05-06 11:54:31,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1058464830] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:31,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:31,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:54:31,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205194942] [2021-05-06 11:54:31,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:54:31,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:31,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:54:31,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=1773, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:54:31,969 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand has 49 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 48 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:34,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:34,346 INFO L93 Difference]: Finished difference Result 199 states and 209 transitions. [2021-05-06 11:54:34,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:54:34,347 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 48 states have internal predecessors, (78), 2 states have call successors, (3), 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 82 [2021-05-06 11:54:34,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:34,347 INFO L225 Difference]: With dead ends: 199 [2021-05-06 11:54:34,347 INFO L226 Difference]: Without dead ends: 130 [2021-05-06 11:54:34,349 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2840 ImplicationChecksByTransitivity, 2481.2ms TimeCoverageRelationStatistics Valid=2484, Invalid=7022, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:54:34,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-06 11:54:34,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2021-05-06 11:54:34,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.04) internal successors, (130), 125 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 11:54:34,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2021-05-06 11:54:34,362 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 82 [2021-05-06 11:54:34,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:34,363 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2021-05-06 11:54:34,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 48 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:34,363 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2021-05-06 11:54:34,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:54:34,363 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:34,364 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:34,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:54:34,364 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:34,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:34,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1159177735, now seen corresponding path program 21 times [2021-05-06 11:54:34,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:34,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543537618] [2021-05-06 11:54:34,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:34,376 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:34,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:34,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:34,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:34,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:34,408 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:34,421 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:34,424 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:34,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:34,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:34,446 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:34,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:34,454 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:34,455 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:34,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:34,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:34,469 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:34,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:34,479 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:34,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:34,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:34,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:34,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:34,514 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:34,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:34,537 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:34,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:34,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:34,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:34,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:34,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:35,532 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:35,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543537618] [2021-05-06 11:54:35,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1543537618] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:35,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:35,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:54:35,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291428247] [2021-05-06 11:54:35,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:54:35,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:35,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:54:35,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=957, Invalid=1905, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:54:35,534 INFO L87 Difference]: Start difference. First operand 130 states and 134 transitions. Second operand has 51 states, 51 states have (on average 1.588235294117647) internal successors, (81), 50 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:38,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:38,163 INFO L93 Difference]: Finished difference Result 203 states and 213 transitions. [2021-05-06 11:54:38,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:54:38,163 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.588235294117647) internal successors, (81), 50 states have internal predecessors, (81), 2 states have call successors, (3), 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 85 [2021-05-06 11:54:38,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:38,164 INFO L225 Difference]: With dead ends: 203 [2021-05-06 11:54:38,164 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 11:54:38,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3092 ImplicationChecksByTransitivity, 2705.7ms TimeCoverageRelationStatistics Valid=2708, Invalid=7594, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:54:38,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 11:54:38,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-06 11:54:38,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0390625) internal successors, (133), 128 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 11:54:38,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 137 transitions. [2021-05-06 11:54:38,179 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 137 transitions. Word has length 85 [2021-05-06 11:54:38,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:38,179 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 137 transitions. [2021-05-06 11:54:38,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.588235294117647) internal successors, (81), 50 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:38,179 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 137 transitions. [2021-05-06 11:54:38,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 11:54:38,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:38,180 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:38,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:54:38,180 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:38,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:38,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1592179199, now seen corresponding path program 22 times [2021-05-06 11:54:38,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:38,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899782943] [2021-05-06 11:54:38,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:38,199 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:38,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:38,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:38,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:38,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:38,233 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:38,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:38,250 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:38,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:38,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:38,263 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:38,271 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:38,271 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:38,284 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:38,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:38,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:38,302 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:38,312 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:38,317 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:38,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:38,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:38,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:38,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:38,361 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:38,380 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:38,382 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:38,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:38,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:38,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:38,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:38,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:38,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:39,341 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:39,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899782943] [2021-05-06 11:54:39,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1899782943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:39,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:39,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:54:39,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96725685] [2021-05-06 11:54:39,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:54:39,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:39,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:54:39,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1002, Invalid=1860, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:54:39,343 INFO L87 Difference]: Start difference. First operand 133 states and 137 transitions. Second operand has 54 states, 54 states have (on average 1.5555555555555556) internal successors, (84), 53 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:42,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:42,105 INFO L93 Difference]: Finished difference Result 220 states and 243 transitions. [2021-05-06 11:54:42,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:54:42,106 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.5555555555555556) internal successors, (84), 53 states have internal predecessors, (84), 2 states have call successors, (3), 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 88 [2021-05-06 11:54:42,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:42,106 INFO L225 Difference]: With dead ends: 220 [2021-05-06 11:54:42,106 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:54:42,107 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3151 ImplicationChecksByTransitivity, 2828.2ms TimeCoverageRelationStatistics Valid=3000, Invalid=7920, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:54:42,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:54:42,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 95. [2021-05-06 11:54:42,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0444444444444445) internal successors, (94), 90 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 11:54:42,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2021-05-06 11:54:42,119 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2021-05-06 11:54:42,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:42,119 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2021-05-06 11:54:42,119 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.5555555555555556) internal successors, (84), 53 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:42,119 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2021-05-06 11:54:42,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 11:54:42,119 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:42,120 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:42,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:54:42,120 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:42,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:42,120 INFO L82 PathProgramCache]: Analyzing trace with hash -598543509, now seen corresponding path program 23 times [2021-05-06 11:54:42,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:42,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812859719] [2021-05-06 11:54:42,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:42,128 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:42,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:42,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:42,154 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:42,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:42,164 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:42,178 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:42,184 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:42,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:42,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:42,197 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:42,204 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:42,205 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:42,207 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:42,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:42,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:42,221 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:42,228 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:42,232 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:42,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:42,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:42,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:42,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:42,278 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:42,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:42,295 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:42,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:42,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:42,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:42,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:42,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:42,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:43,321 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:43,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812859719] [2021-05-06 11:54:43,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [812859719] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:43,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:43,321 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:54:43,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18695968] [2021-05-06 11:54:43,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:54:43,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:43,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:54:43,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1107, Invalid=2085, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:54:43,322 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:46,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:46,384 INFO L93 Difference]: Finished difference Result 187 states and 198 transitions. [2021-05-06 11:54:46,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:54:46,385 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (3), 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 94 [2021-05-06 11:54:46,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:46,386 INFO L225 Difference]: With dead ends: 187 [2021-05-06 11:54:46,386 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 11:54:46,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3529 ImplicationChecksByTransitivity, 3105.3ms TimeCoverageRelationStatistics Valid=3315, Invalid=8895, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:54:46,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 11:54:46,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-06 11:54:46,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0421052631578946) internal successors, (99), 95 states have internal predecessors, (99), 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 11:54:46,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2021-05-06 11:54:46,399 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 94 [2021-05-06 11:54:46,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:46,399 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2021-05-06 11:54:46,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:46,399 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2021-05-06 11:54:46,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:54:46,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:46,400 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:46,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:54:46,400 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:46,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:46,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1275871666, now seen corresponding path program 24 times [2021-05-06 11:54:46,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:46,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737392671] [2021-05-06 11:54:46,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:46,408 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:46,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:46,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:46,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:46,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:46,450 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:46,471 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:46,474 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:46,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:46,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:46,490 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:46,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:46,500 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:46,502 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:46,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:46,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:46,518 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:46,527 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:46,531 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:46,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:46,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:46,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:46,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:46,572 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:46,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:46,589 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:46,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:47,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:47,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:47,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:47,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:48,209 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:48,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737392671] [2021-05-06 11:54:48,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [737392671] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:48,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:48,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:54:48,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146593582] [2021-05-06 11:54:48,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:54:48,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:48,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:54:48,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=3467, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:54:48,211 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand has 60 states, 60 states have (on average 1.5833333333333333) internal successors, (95), 59 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:51,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:51,412 INFO L93 Difference]: Finished difference Result 256 states and 266 transitions. [2021-05-06 11:54:51,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:54:51,413 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.5833333333333333) internal successors, (95), 59 states have internal predecessors, (95), 2 states have call successors, (3), 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 99 [2021-05-06 11:54:51,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:51,413 INFO L225 Difference]: With dead ends: 256 [2021-05-06 11:54:51,413 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:54:51,414 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1607 ImplicationChecksByTransitivity, 3126.0ms TimeCoverageRelationStatistics Valid=608, Invalid=8512, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 11:54:51,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:54:51,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-05-06 11:54:51,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.0314465408805031) internal successors, (164), 159 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 11:54:51,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 168 transitions. [2021-05-06 11:54:51,431 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 168 transitions. Word has length 99 [2021-05-06 11:54:51,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:51,431 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 168 transitions. [2021-05-06 11:54:51,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.5833333333333333) internal successors, (95), 59 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:54:51,431 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 168 transitions. [2021-05-06 11:54:51,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:54:51,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:51,432 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:51,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:54:51,432 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:51,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:51,432 INFO L82 PathProgramCache]: Analyzing trace with hash -628007255, now seen corresponding path program 25 times [2021-05-06 11:54:51,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:51,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429028692] [2021-05-06 11:54:51,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:51,442 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:51,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:51,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:51,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:51,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:51,476 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:51,495 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:51,499 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:51,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:51,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:51,516 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:51,525 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:51,526 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:51,528 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:51,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:51,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:51,544 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:51,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:51,555 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:51,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:51,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:51,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:51,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:51,590 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:51,604 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:51,605 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:51,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:52,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:52,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:52,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:52,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:53,091 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:53,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429028692] [2021-05-06 11:54:53,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [429028692] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:53,091 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:53,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:54:53,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847388979] [2021-05-06 11:54:53,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:54:53,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:53,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:54:53,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1339, Invalid=2693, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:54:53,092 INFO L87 Difference]: Start difference. First operand 164 states and 168 transitions. Second operand has 61 states, 61 states have (on average 1.5901639344262295) internal successors, (97), 60 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 11:54:56,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:56,604 INFO L93 Difference]: Finished difference Result 259 states and 269 transitions. [2021-05-06 11:54:56,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:54:56,610 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.5901639344262295) internal successors, (97), 60 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 11:54:56,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:56,611 INFO L225 Difference]: With dead ends: 259 [2021-05-06 11:54:56,611 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 11:54:56,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4445 ImplicationChecksByTransitivity, 3746.4ms TimeCoverageRelationStatistics Valid=3826, Invalid=10936, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:54:56,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 11:54:56,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-05-06 11:54:56,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0308641975308641) internal successors, (167), 162 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 11:54:56,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 171 transitions. [2021-05-06 11:54:56,633 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 171 transitions. Word has length 101 [2021-05-06 11:54:56,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:56,633 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 171 transitions. [2021-05-06 11:54:56,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.5901639344262295) internal successors, (97), 60 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 11:54:56,633 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 171 transitions. [2021-05-06 11:54:56,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:54:56,634 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:56,634 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:54:56,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:54:56,634 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:56,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:56,634 INFO L82 PathProgramCache]: Analyzing trace with hash 987789215, now seen corresponding path program 26 times [2021-05-06 11:54:56,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:56,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050687561] [2021-05-06 11:54:56,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:56,642 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:56,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:56,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:56,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:56,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:56,680 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:56,698 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:56,706 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:54:56,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:56,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:56,724 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:54:56,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:56,733 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:56,736 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:54:56,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:56,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:54:56,753 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:54:56,763 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:56,769 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:54:56,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:56,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:54:56,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:54:56,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:54:56,812 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:54:56,829 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:54:56,831 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:54:56,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:57,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:57,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:57,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:57,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:54:58,312 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:58,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050687561] [2021-05-06 11:54:58,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1050687561] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:58,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:58,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:54:58,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938920948] [2021-05-06 11:54:58,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:54:58,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:58,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:54:58,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=2860, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:54:58,313 INFO L87 Difference]: Start difference. First operand 167 states and 171 transitions. Second operand has 63 states, 63 states have (on average 1.5873015873015872) internal successors, (100), 62 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 11:55:01,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:01,923 INFO L93 Difference]: Finished difference Result 263 states and 273 transitions. [2021-05-06 11:55:01,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:55:01,923 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.5873015873015872) internal successors, (100), 62 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 11:55:01,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:01,924 INFO L225 Difference]: With dead ends: 263 [2021-05-06 11:55:01,924 INFO L226 Difference]: Without dead ends: 170 [2021-05-06 11:55:01,925 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4751 ImplicationChecksByTransitivity, 3856.8ms TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 11:55:01,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-06 11:55:01,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2021-05-06 11:55:01,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 165 states have (on average 1.0303030303030303) internal successors, (170), 165 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 11:55:01,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 174 transitions. [2021-05-06 11:55:01,951 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 174 transitions. Word has length 104 [2021-05-06 11:55:01,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:01,952 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 174 transitions. [2021-05-06 11:55:01,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.5873015873015872) internal successors, (100), 62 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 11:55:01,952 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 174 transitions. [2021-05-06 11:55:01,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:55:01,953 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:01,953 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:01,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:55:01,953 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:01,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:01,953 INFO L82 PathProgramCache]: Analyzing trace with hash -754356289, now seen corresponding path program 27 times [2021-05-06 11:55:01,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:01,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236148968] [2021-05-06 11:55:01,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:01,961 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:01,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:01,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:01,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:01,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:01,997 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:02,013 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:02,016 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:02,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:02,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:02,033 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:02,042 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:02,043 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:02,045 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:02,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:02,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:02,062 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:02,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:02,074 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:02,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:02,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:02,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:02,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:02,113 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:02,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:02,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:02,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:02,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:02,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:02,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:02,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:02,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:03,499 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:03,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236148968] [2021-05-06 11:55:03,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1236148968] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:03,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:03,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:55:03,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449022871] [2021-05-06 11:55:03,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:55:03,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:03,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:55:03,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1423, Invalid=2737, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:55:03,501 INFO L87 Difference]: Start difference. First operand 170 states and 174 transitions. Second operand has 65 states, 65 states have (on average 1.5846153846153845) internal successors, (103), 64 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 11:55:07,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:07,298 INFO L93 Difference]: Finished difference Result 275 states and 293 transitions. [2021-05-06 11:55:07,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:55:07,298 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.5846153846153845) internal successors, (103), 64 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 11:55:07,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:07,299 INFO L225 Difference]: With dead ends: 275 [2021-05-06 11:55:07,299 INFO L226 Difference]: Without dead ends: 181 [2021-05-06 11:55:07,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4651 ImplicationChecksByTransitivity, 3905.0ms TimeCoverageRelationStatistics Valid=4263, Invalid=11739, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 11:55:07,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-06 11:55:07,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 113. [2021-05-06 11:55:07,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.037037037037037) internal successors, (112), 108 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 11:55:07,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2021-05-06 11:55:07,315 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 107 [2021-05-06 11:55:07,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:07,316 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2021-05-06 11:55:07,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.5846153846153845) internal successors, (103), 64 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 11:55:07,316 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2021-05-06 11:55:07,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-06 11:55:07,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:07,316 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:07,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:55:07,317 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:07,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:07,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1881634226, now seen corresponding path program 28 times [2021-05-06 11:55:07,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:07,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290974856] [2021-05-06 11:55:07,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:07,326 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:07,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:07,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:07,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:07,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:07,372 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:07,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:07,389 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:07,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:07,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:07,403 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:07,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:07,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:07,414 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:07,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:07,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:07,427 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:07,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:07,440 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:07,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:07,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:07,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:07,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:07,476 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:07,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:07,491 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:07,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:08,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:08,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:08,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:08,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:09,484 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:09,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290974856] [2021-05-06 11:55:09,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [290974856] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:09,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:09,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:55:09,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461664731] [2021-05-06 11:55:09,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:55:09,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:09,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:55:09,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=4435, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:55:09,486 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand has 68 states, 68 states have (on average 1.588235294117647) internal successors, (108), 67 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:13,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:13,657 INFO L93 Difference]: Finished difference Result 292 states and 302 transitions. [2021-05-06 11:55:13,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:55:13,658 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.588235294117647) internal successors, (108), 67 states have internal predecessors, (108), 2 states have call successors, (3), 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 112 [2021-05-06 11:55:13,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:13,658 INFO L225 Difference]: With dead ends: 292 [2021-05-06 11:55:13,658 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 11:55:13,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 3896.4ms TimeCoverageRelationStatistics Valid=729, Invalid=11043, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:55:13,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 11:55:13,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-05-06 11:55:13,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.0274725274725274) internal successors, (187), 182 states have internal predecessors, (187), 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 11:55:13,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 191 transitions. [2021-05-06 11:55:13,677 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 191 transitions. Word has length 112 [2021-05-06 11:55:13,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:13,678 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 191 transitions. [2021-05-06 11:55:13,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 1.588235294117647) internal successors, (108), 67 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:13,678 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 191 transitions. [2021-05-06 11:55:13,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:55:13,678 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:13,678 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:13,678 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:55:13,678 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:13,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:13,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1204447789, now seen corresponding path program 29 times [2021-05-06 11:55:13,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:13,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52208336] [2021-05-06 11:55:13,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:13,692 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:13,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:13,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:13,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:13,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:13,725 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:13,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:13,741 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:13,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:13,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:13,754 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:13,762 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:13,762 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:13,767 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:13,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:13,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:13,790 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:13,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:13,800 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:13,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:13,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:13,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:13,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:13,833 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:13,848 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:13,849 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:13,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:14,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:14,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:14,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:14,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:15,502 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:15,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52208336] [2021-05-06 11:55:15,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [52208336] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:15,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:15,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 11:55:15,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311332095] [2021-05-06 11:55:15,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 11:55:15,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:15,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 11:55:15,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1642, Invalid=3470, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:55:15,504 INFO L87 Difference]: Start difference. First operand 187 states and 191 transitions. Second operand has 69 states, 69 states have (on average 1.5942028985507246) internal successors, (110), 68 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:19,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:19,765 INFO L93 Difference]: Finished difference Result 295 states and 305 transitions. [2021-05-06 11:55:19,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:55:19,765 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.5942028985507246) internal successors, (110), 68 states have internal predecessors, (110), 2 states have call successors, (3), 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 114 [2021-05-06 11:55:19,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:19,766 INFO L225 Difference]: With dead ends: 295 [2021-05-06 11:55:19,766 INFO L226 Difference]: Without dead ends: 190 [2021-05-06 11:55:19,767 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5690 ImplicationChecksByTransitivity, 4485.7ms TimeCoverageRelationStatistics Valid=4754, Invalid=14152, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 11:55:19,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-06 11:55:19,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2021-05-06 11:55:19,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.027027027027027) internal successors, (190), 185 states have internal predecessors, (190), 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 11:55:19,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 194 transitions. [2021-05-06 11:55:19,792 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 194 transitions. Word has length 114 [2021-05-06 11:55:19,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:19,792 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 194 transitions. [2021-05-06 11:55:19,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 1.5942028985507246) internal successors, (110), 68 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:19,792 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 194 transitions. [2021-05-06 11:55:19,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 11:55:19,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:19,793 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:19,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:55:19,793 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:19,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:19,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1952117323, now seen corresponding path program 30 times [2021-05-06 11:55:19,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:19,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160745651] [2021-05-06 11:55:19,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:19,801 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:19,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:19,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:19,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:19,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:19,841 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:19,856 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:19,859 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:19,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:19,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:19,874 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:19,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:19,884 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:19,886 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:19,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:19,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:19,901 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:19,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:19,913 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:19,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:19,929 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:19,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:19,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:19,948 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:19,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:19,963 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:19,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:20,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:20,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:20,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:20,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:22,073 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:22,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160745651] [2021-05-06 11:55:22,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [160745651] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:22,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:22,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 11:55:22,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018488278] [2021-05-06 11:55:22,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 11:55:22,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:22,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 11:55:22,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=4832, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:55:22,075 INFO L87 Difference]: Start difference. First operand 190 states and 194 transitions. Second operand has 71 states, 71 states have (on average 1.591549295774648) internal successors, (113), 70 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:26,490 INFO L93 Difference]: Finished difference Result 298 states and 307 transitions. [2021-05-06 11:55:26,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:55:26,492 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.591549295774648) internal successors, (113), 70 states have internal predecessors, (113), 2 states have call successors, (3), 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 117 [2021-05-06 11:55:26,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:26,493 INFO L225 Difference]: With dead ends: 298 [2021-05-06 11:55:26,493 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 11:55:26,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2245 ImplicationChecksByTransitivity, 4183.0ms TimeCoverageRelationStatistics Valid=774, Invalid=12108, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:55:26,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 11:55:26,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2021-05-06 11:55:26,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.0267379679144386) internal successors, (192), 187 states have internal predecessors, (192), 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 11:55:26,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 196 transitions. [2021-05-06 11:55:26,518 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 196 transitions. Word has length 117 [2021-05-06 11:55:26,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:26,519 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 196 transitions. [2021-05-06 11:55:26,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 1.591549295774648) internal successors, (113), 70 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:26,519 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 196 transitions. [2021-05-06 11:55:26,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:55:26,519 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:26,519 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:26,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:55:26,520 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:26,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:26,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1503571482, now seen corresponding path program 31 times [2021-05-06 11:55:26,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:26,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631251198] [2021-05-06 11:55:26,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:26,528 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:26,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:26,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:26,569 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:26,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:26,586 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:26,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:26,609 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:26,616 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:26,617 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:26,619 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:26,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:26,632 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:26,639 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:26,648 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:26,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:26,660 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:26,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:26,681 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:26,695 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:26,696 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:26,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:27,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:27,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:27,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:27,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:28,906 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:28,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631251198] [2021-05-06 11:55:28,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1631251198] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:28,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:28,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:55:28,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886787866] [2021-05-06 11:55:28,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:55:28,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:28,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:55:28,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=4977, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:55:28,908 INFO L87 Difference]: Start difference. First operand 192 states and 196 transitions. Second operand has 72 states, 72 states have (on average 1.5972222222222223) internal successors, (115), 71 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 11:55:33,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:33,541 INFO L93 Difference]: Finished difference Result 300 states and 309 transitions. [2021-05-06 11:55:33,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:55:33,541 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.5972222222222223) internal successors, (115), 71 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 11:55:33,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:33,542 INFO L225 Difference]: With dead ends: 300 [2021-05-06 11:55:33,542 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 11:55:33,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2319 ImplicationChecksByTransitivity, 4378.0ms TimeCoverageRelationStatistics Valid=782, Invalid=12558, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 11:55:33,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 11:55:33,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2021-05-06 11:55:33,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 189 states have (on average 1.0264550264550265) internal successors, (194), 189 states have internal predecessors, (194), 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 11:55:33,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 198 transitions. [2021-05-06 11:55:33,561 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 198 transitions. Word has length 119 [2021-05-06 11:55:33,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:33,561 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 198 transitions. [2021-05-06 11:55:33,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.5972222222222223) internal successors, (115), 71 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 11:55:33,561 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 198 transitions. [2021-05-06 11:55:33,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 11:55:33,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:33,562 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:33,562 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:55:33,562 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:33,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:33,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1884174017, now seen corresponding path program 32 times [2021-05-06 11:55:33,563 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:33,563 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040973991] [2021-05-06 11:55:33,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:33,575 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:33,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:33,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:33,633 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:33,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,653 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:33,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:33,671 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:33,678 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,679 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:33,686 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:33,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:33,701 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:33,708 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,711 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:33,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,742 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:33,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:33,767 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:33,784 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,785 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:33,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:34,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:34,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:34,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:34,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:35,525 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:35,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040973991] [2021-05-06 11:55:35,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1040973991] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:35,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:35,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:55:35,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235280308] [2021-05-06 11:55:35,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:55:35,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:35,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:55:35,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1805, Invalid=3895, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:55:35,527 INFO L87 Difference]: Start difference. First operand 194 states and 198 transitions. Second operand has 73 states, 73 states have (on average 1.6027397260273972) internal successors, (117), 72 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:40,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:40,296 INFO L93 Difference]: Finished difference Result 303 states and 313 transitions. [2021-05-06 11:55:40,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:55:40,297 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.6027397260273972) internal successors, (117), 72 states have internal predecessors, (117), 2 states have call successors, (3), 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 121 [2021-05-06 11:55:40,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:40,297 INFO L225 Difference]: With dead ends: 303 [2021-05-06 11:55:40,297 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:55:40,298 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6353 ImplicationChecksByTransitivity, 4894.0ms TimeCoverageRelationStatistics Valid=5236, Invalid=15934, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 11:55:40,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:55:40,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2021-05-06 11:55:40,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 192 states have (on average 1.0260416666666667) internal successors, (197), 192 states have internal predecessors, (197), 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 11:55:40,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 201 transitions. [2021-05-06 11:55:40,323 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 201 transitions. Word has length 121 [2021-05-06 11:55:40,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:40,324 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 201 transitions. [2021-05-06 11:55:40,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.6027397260273972) internal successors, (117), 72 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:40,324 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 201 transitions. [2021-05-06 11:55:40,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-06 11:55:40,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:40,325 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:40,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:55:40,325 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:40,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:40,325 INFO L82 PathProgramCache]: Analyzing trace with hash -499970553, now seen corresponding path program 33 times [2021-05-06 11:55:40,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:40,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133708645] [2021-05-06 11:55:40,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:40,333 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:40,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:40,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:40,371 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:40,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,389 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:40,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,394 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:40,403 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:40,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:40,414 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:40,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:40,427 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:40,434 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,438 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:40,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:40,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:40,480 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:40,494 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,495 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:40,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:41,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:41,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,879 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:42,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133708645] [2021-05-06 11:55:42,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1133708645] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:42,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:42,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:55:42,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402399289] [2021-05-06 11:55:42,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:55:42,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:42,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:55:42,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=5397, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:55:42,881 INFO L87 Difference]: Start difference. First operand 197 states and 201 transitions. Second operand has 75 states, 75 states have (on average 1.6) internal successors, (120), 74 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:47,357 INFO L93 Difference]: Finished difference Result 306 states and 315 transitions. [2021-05-06 11:55:47,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:55:47,358 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.6) internal successors, (120), 74 states have internal predecessors, (120), 2 states have call successors, (3), 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 124 [2021-05-06 11:55:47,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:47,358 INFO L225 Difference]: With dead ends: 306 [2021-05-06 11:55:47,359 INFO L226 Difference]: Without dead ends: 199 [2021-05-06 11:55:47,359 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2517 ImplicationChecksByTransitivity, 4718.8ms TimeCoverageRelationStatistics Valid=828, Invalid=13692, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 11:55:47,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-06 11:55:47,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2021-05-06 11:55:47,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0257731958762886) internal successors, (199), 194 states have internal predecessors, (199), 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 11:55:47,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 203 transitions. [2021-05-06 11:55:47,376 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 203 transitions. Word has length 124 [2021-05-06 11:55:47,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:47,376 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 203 transitions. [2021-05-06 11:55:47,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.6) internal successors, (120), 74 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,376 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 203 transitions. [2021-05-06 11:55:47,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-05-06 11:55:47,377 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:47,377 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:47,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:55:47,377 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:47,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:47,377 INFO L82 PathProgramCache]: Analyzing trace with hash -227935732, now seen corresponding path program 34 times [2021-05-06 11:55:47,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:47,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369401086] [2021-05-06 11:55:47,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:47,384 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,386 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,394 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,415 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,431 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:47,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,445 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:47,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,453 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,464 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:47,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,481 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:47,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,491 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,524 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,538 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,539 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:48,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:48,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:48,199 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 11:55:48,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:49,492 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:49,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369401086] [2021-05-06 11:55:49,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1369401086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:49,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:49,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:55:49,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626367826] [2021-05-06 11:55:49,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:55:49,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:49,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:55:49,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1943, Invalid=4219, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:55:49,494 INFO L87 Difference]: Start difference. First operand 199 states and 203 transitions. Second operand has 76 states, 76 states have (on average 1.605263157894737) internal successors, (122), 75 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:54,619 INFO L93 Difference]: Finished difference Result 309 states and 319 transitions. [2021-05-06 11:55:54,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:55:54,620 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.605263157894737) internal successors, (122), 75 states have internal predecessors, (122), 2 states have call successors, (3), 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 126 [2021-05-06 11:55:54,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:54,621 INFO L225 Difference]: With dead ends: 309 [2021-05-06 11:55:54,621 INFO L226 Difference]: Without dead ends: 202 [2021-05-06 11:55:54,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6884 ImplicationChecksByTransitivity, 5332.9ms TimeCoverageRelationStatistics Valid=5644, Invalid=17308, Unknown=0, NotChecked=0, Total=22952 [2021-05-06 11:55:54,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-06 11:55:54,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2021-05-06 11:55:54,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0253807106598984) internal successors, (202), 197 states have internal predecessors, (202), 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 11:55:54,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 206 transitions. [2021-05-06 11:55:54,647 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 206 transitions. Word has length 126 [2021-05-06 11:55:54,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:54,648 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 206 transitions. [2021-05-06 11:55:54,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 1.605263157894737) internal successors, (122), 75 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,648 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 206 transitions. [2021-05-06 11:55:54,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-06 11:55:54,648 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:54,649 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:54,649 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:55:54,649 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:54,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:54,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1145529522, now seen corresponding path program 35 times [2021-05-06 11:55:54,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:54,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555669162] [2021-05-06 11:55:54,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:54,657 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,695 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,712 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,715 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:54,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,731 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:54,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,740 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,742 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:54,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,758 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:54,766 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,770 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,788 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,810 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,828 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:55,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:55,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:56,779 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:56,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555669162] [2021-05-06 11:55:56,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [555669162] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:56,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:56,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 11:55:56,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338847792] [2021-05-06 11:55:56,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 11:55:56,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:56,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 11:55:56,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2096, Invalid=4384, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:55:56,781 INFO L87 Difference]: Start difference. First operand 202 states and 206 transitions. Second operand has 78 states, 78 states have (on average 1.6025641025641026) internal successors, (125), 77 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:02,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:02,197 INFO L93 Difference]: Finished difference Result 313 states and 323 transitions. [2021-05-06 11:56:02,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 11:56:02,198 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.6025641025641026) internal successors, (125), 77 states have internal predecessors, (125), 2 states have call successors, (3), 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 129 [2021-05-06 11:56:02,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:02,198 INFO L225 Difference]: With dead ends: 313 [2021-05-06 11:56:02,198 INFO L226 Difference]: Without dead ends: 205 [2021-05-06 11:56:02,200 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7265 ImplicationChecksByTransitivity, 5452.7ms TimeCoverageRelationStatistics Valid=6055, Invalid=18125, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 11:56:02,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-05-06 11:56:02,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-05-06 11:56:02,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.025) internal successors, (205), 200 states have internal predecessors, (205), 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 11:56:02,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 209 transitions. [2021-05-06 11:56:02,217 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 209 transitions. Word has length 129 [2021-05-06 11:56:02,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:02,218 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 209 transitions. [2021-05-06 11:56:02,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 1.6025641025641026) internal successors, (125), 77 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:02,218 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 209 transitions. [2021-05-06 11:56:02,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-06 11:56:02,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:02,218 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:02,218 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:56:02,219 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:02,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:02,219 INFO L82 PathProgramCache]: Analyzing trace with hash 496535862, now seen corresponding path program 36 times [2021-05-06 11:56:02,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:02,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58734445] [2021-05-06 11:56:02,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:02,229 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:02,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:02,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:02,266 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:02,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,285 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:02,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:02,298 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:02,306 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,307 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:02,308 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:02,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,318 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:02,322 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:02,330 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,333 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:02,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,348 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,355 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:02,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:02,376 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:02,390 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,391 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:02,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:02,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:03,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:03,002 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 11:56:03,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:04,373 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:04,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58734445] [2021-05-06 11:56:04,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [58734445] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:04,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:04,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 11:56:04,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735906772] [2021-05-06 11:56:04,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 11:56:04,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:04,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 11:56:04,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2166, Invalid=4640, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:56:04,374 INFO L87 Difference]: Start difference. First operand 205 states and 209 transitions. Second operand has 80 states, 80 states have (on average 1.6) internal successors, (128), 79 states have internal predecessors, (128), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:10,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:10,158 INFO L93 Difference]: Finished difference Result 317 states and 327 transitions. [2021-05-06 11:56:10,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 11:56:10,163 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.6) internal successors, (128), 79 states have internal predecessors, (128), 2 states have call successors, (3), 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 132 [2021-05-06 11:56:10,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:10,164 INFO L225 Difference]: With dead ends: 317 [2021-05-06 11:56:10,164 INFO L226 Difference]: Without dead ends: 208 [2021-05-06 11:56:10,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 5693.1ms TimeCoverageRelationStatistics Valid=6303, Invalid=19137, Unknown=0, NotChecked=0, Total=25440 [2021-05-06 11:56:10,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-06 11:56:10,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2021-05-06 11:56:10,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.0246305418719213) internal successors, (208), 203 states have internal predecessors, (208), 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 11:56:10,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 212 transitions. [2021-05-06 11:56:10,187 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 212 transitions. Word has length 132 [2021-05-06 11:56:10,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:10,187 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 212 transitions. [2021-05-06 11:56:10,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 80 states have (on average 1.6) internal successors, (128), 79 states have internal predecessors, (128), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:10,187 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 212 transitions. [2021-05-06 11:56:10,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-06 11:56:10,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:10,188 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:10,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:56:10,188 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:10,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:10,188 INFO L82 PathProgramCache]: Analyzing trace with hash -573003128, now seen corresponding path program 37 times [2021-05-06 11:56:10,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:10,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027283426] [2021-05-06 11:56:10,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:10,198 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:10,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:10,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:10,231 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:10,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,247 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:10,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:10,261 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:10,268 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,269 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:10,270 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:10,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:10,284 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:10,291 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,294 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:10,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:10,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:10,328 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:10,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,344 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:10,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:10,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:10,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:10,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:10,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:12,433 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:12,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027283426] [2021-05-06 11:56:12,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2027283426] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:12,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:12,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:56:12,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426606971] [2021-05-06 11:56:12,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:56:12,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:12,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:56:12,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2282, Invalid=4858, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:56:12,434 INFO L87 Difference]: Start difference. First operand 208 states and 212 transitions. Second operand has 82 states, 82 states have (on average 1.5975609756097562) internal successors, (131), 81 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:18,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:18,350 INFO L93 Difference]: Finished difference Result 321 states and 331 transitions. [2021-05-06 11:56:18,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 11:56:18,350 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.5975609756097562) internal successors, (131), 81 states have internal predecessors, (131), 2 states have call successors, (3), 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 135 [2021-05-06 11:56:18,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:18,351 INFO L225 Difference]: With dead ends: 321 [2021-05-06 11:56:18,351 INFO L226 Difference]: Without dead ends: 211 [2021-05-06 11:56:18,353 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8057 ImplicationChecksByTransitivity, 5927.4ms TimeCoverageRelationStatistics Valid=6646, Invalid=20086, Unknown=0, NotChecked=0, Total=26732 [2021-05-06 11:56:18,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-06 11:56:18,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-05-06 11:56:18,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0242718446601942) internal successors, (211), 206 states have internal predecessors, (211), 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 11:56:18,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 215 transitions. [2021-05-06 11:56:18,376 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 215 transitions. Word has length 135 [2021-05-06 11:56:18,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:18,377 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 215 transitions. [2021-05-06 11:56:18,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 1.5975609756097562) internal successors, (131), 81 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:18,377 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 215 transitions. [2021-05-06 11:56:18,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-05-06 11:56:18,377 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:18,377 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:18,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:56:18,378 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:18,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:18,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1054935456, now seen corresponding path program 38 times [2021-05-06 11:56:18,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:18,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973407829] [2021-05-06 11:56:18,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:18,387 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:18,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,397 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:18,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:18,418 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:18,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,435 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:18,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,445 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:18,450 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:18,458 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,459 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:18,460 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:18,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:18,495 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:18,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,505 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:18,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:18,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:18,557 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:18,574 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,576 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:18,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:19,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:19,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:19,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:19,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:19,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:20,642 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:20,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973407829] [2021-05-06 11:56:20,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [973407829] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:20,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:20,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:56:20,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542903817] [2021-05-06 11:56:20,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:56:20,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:20,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:56:20,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2324, Invalid=4648, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:56:20,643 INFO L87 Difference]: Start difference. First operand 211 states and 215 transitions. Second operand has 84 states, 84 states have (on average 1.5952380952380953) internal successors, (134), 83 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:26,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:26,730 INFO L93 Difference]: Finished difference Result 347 states and 379 transitions. [2021-05-06 11:56:26,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 11:56:26,730 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.5952380952380953) internal successors, (134), 83 states have internal predecessors, (134), 2 states have call successors, (3), 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 138 [2021-05-06 11:56:26,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:26,731 INFO L225 Difference]: With dead ends: 347 [2021-05-06 11:56:26,731 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 11:56:26,732 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7927 ImplicationChecksByTransitivity, 6081.6ms TimeCoverageRelationStatistics Valid=6966, Invalid=20094, Unknown=0, NotChecked=0, Total=27060 [2021-05-06 11:56:26,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 11:56:26,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 144. [2021-05-06 11:56:26,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.0287769784172662) internal successors, (143), 139 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 11:56:26,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 147 transitions. [2021-05-06 11:56:26,745 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 147 transitions. Word has length 138 [2021-05-06 11:56:26,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:26,746 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 147 transitions. [2021-05-06 11:56:26,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 1.5952380952380953) internal successors, (134), 83 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:26,746 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 147 transitions. [2021-05-06 11:56:26,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:56:26,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:26,746 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:26,746 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:56:26,746 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:26,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:26,747 INFO L82 PathProgramCache]: Analyzing trace with hash -131923719, now seen corresponding path program 39 times [2021-05-06 11:56:26,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:26,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140559596] [2021-05-06 11:56:26,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:26,753 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:26,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:26,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:26,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:26,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:26,785 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:26,799 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:26,815 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:26,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:26,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:26,835 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:26,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:26,846 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:26,848 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:26,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:26,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:26,866 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:26,876 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:26,879 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:26,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:26,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:26,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:26,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:26,910 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:26,925 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:26,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:26,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:27,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:27,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:29,367 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:29,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140559596] [2021-05-06 11:56:29,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1140559596] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:29,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:29,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 11:56:29,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822086690] [2021-05-06 11:56:29,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 11:56:29,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:29,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 11:56:29,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2612, Invalid=5398, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:56:29,369 INFO L87 Difference]: Start difference. First operand 144 states and 147 transitions. Second operand has 87 states, 87 states have (on average 1.5977011494252873) internal successors, (139), 86 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 11:56:36,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:36,090 INFO L93 Difference]: Finished difference Result 379 states and 390 transitions. [2021-05-06 11:56:36,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:56:36,091 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.5977011494252873) internal successors, (139), 86 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 11:56:36,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:36,092 INFO L225 Difference]: With dead ends: 379 [2021-05-06 11:56:36,092 INFO L226 Difference]: Without dead ends: 243 [2021-05-06 11:56:36,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9086 ImplicationChecksByTransitivity, 6715.7ms TimeCoverageRelationStatistics Valid=7573, Invalid=22529, Unknown=0, NotChecked=0, Total=30102 [2021-05-06 11:56:36,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-06 11:56:36,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-05-06 11:56:36,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 238 states have (on average 1.0210084033613445) internal successors, (243), 238 states have internal predecessors, (243), 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 11:56:36,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 247 transitions. [2021-05-06 11:56:36,125 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 247 transitions. Word has length 143 [2021-05-06 11:56:36,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:36,125 INFO L480 AbstractCegarLoop]: Abstraction has 243 states and 247 transitions. [2021-05-06 11:56:36,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 1.5977011494252873) internal successors, (139), 86 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 11:56:36,126 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 247 transitions. [2021-05-06 11:56:36,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 11:56:36,126 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:36,126 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:36,126 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:56:36,127 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:36,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:36,127 INFO L82 PathProgramCache]: Analyzing trace with hash 685840655, now seen corresponding path program 40 times [2021-05-06 11:56:36,127 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:36,127 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385953468] [2021-05-06 11:56:36,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:36,141 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:36,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:36,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:36,184 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:36,200 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,203 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:36,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:36,220 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:36,228 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,229 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:36,231 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:36,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:36,247 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:36,256 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,260 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:36,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:36,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:36,295 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:36,311 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,312 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:36,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:37,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:37,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:37,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:37,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:39,459 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:39,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385953468] [2021-05-06 11:56:39,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1385953468] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:39,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:39,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 11:56:39,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210298863] [2021-05-06 11:56:39,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 11:56:39,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:39,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 11:56:39,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=834, Invalid=7538, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:56:39,461 INFO L87 Difference]: Start difference. First operand 243 states and 247 transitions. Second operand has 89 states, 89 states have (on average 1.595505617977528) internal successors, (142), 88 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 11:56:46,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:46,398 INFO L93 Difference]: Finished difference Result 382 states and 391 transitions. [2021-05-06 11:56:46,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:56:46,398 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.595505617977528) internal successors, (142), 88 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 11:56:46,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:46,399 INFO L225 Difference]: With dead ends: 382 [2021-05-06 11:56:46,399 INFO L226 Difference]: Without dead ends: 245 [2021-05-06 11:56:46,401 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3499 ImplicationChecksByTransitivity, 6401.3ms TimeCoverageRelationStatistics Valid=1093, Invalid=19213, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 11:56:46,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-06 11:56:46,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 245. [2021-05-06 11:56:46,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 240 states have (on average 1.0208333333333333) internal successors, (245), 240 states have internal predecessors, (245), 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 11:56:46,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 249 transitions. [2021-05-06 11:56:46,444 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 249 transitions. Word has length 146 [2021-05-06 11:56:46,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:46,444 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 249 transitions. [2021-05-06 11:56:46,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 89 states have (on average 1.595505617977528) internal successors, (142), 88 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 11:56:46,444 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 249 transitions. [2021-05-06 11:56:46,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-05-06 11:56:46,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:46,445 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:46,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 11:56:46,445 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:46,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:46,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1193868460, now seen corresponding path program 41 times [2021-05-06 11:56:46,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:46,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778710471] [2021-05-06 11:56:46,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:46,454 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:46,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:46,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:46,486 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:46,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,503 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:46,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:46,517 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:46,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,525 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:46,528 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:46,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:46,541 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:46,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,552 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:46,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:46,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:46,585 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:46,600 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,601 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:46,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:47,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:47,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:47,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:47,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:49,176 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:49,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778710471] [2021-05-06 11:56:49,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [778710471] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:49,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:49,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 11:56:49,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227363246] [2021-05-06 11:56:49,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 11:56:49,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:49,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 11:56:49,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2724, Invalid=5832, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:56:49,177 INFO L87 Difference]: Start difference. First operand 245 states and 249 transitions. Second operand has 90 states, 90 states have (on average 1.6) internal successors, (144), 89 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:56,175 INFO L93 Difference]: Finished difference Result 385 states and 395 transitions. [2021-05-06 11:56:56,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:56:56,175 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 1.6) internal successors, (144), 89 states have internal predecessors, (144), 2 states have call successors, (3), 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 148 [2021-05-06 11:56:56,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:56,176 INFO L225 Difference]: With dead ends: 385 [2021-05-06 11:56:56,176 INFO L226 Difference]: Without dead ends: 248 [2021-05-06 11:56:56,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9713 ImplicationChecksByTransitivity, 7083.0ms TimeCoverageRelationStatistics Valid=7955, Invalid=24265, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 11:56:56,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-06 11:56:56,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2021-05-06 11:56:56,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 243 states have (on average 1.0205761316872428) internal successors, (248), 243 states have internal predecessors, (248), 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 11:56:56,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 252 transitions. [2021-05-06 11:56:56,209 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 252 transitions. Word has length 148 [2021-05-06 11:56:56,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:56,210 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 252 transitions. [2021-05-06 11:56:56,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 90 states have (on average 1.6) internal successors, (144), 89 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,210 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 252 transitions. [2021-05-06 11:56:56,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-06 11:56:56,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:56,211 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:56,211 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 11:56:56,211 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:56,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:56,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1049681450, now seen corresponding path program 42 times [2021-05-06 11:56:56,211 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:56,211 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889256468] [2021-05-06 11:56:56,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:56,219 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:56,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:56,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:56,255 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:56,272 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,275 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:56,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:56,291 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:56,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,300 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:56,302 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:56,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:56,318 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:56,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,331 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:56,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:56,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:56,372 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:56,388 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:56,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:57,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:57,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:57,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:57,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:59,039 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:59,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889256468] [2021-05-06 11:56:59,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [889256468] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:59,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:59,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:56:59,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873889839] [2021-05-06 11:56:59,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:56:59,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:59,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:56:59,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2854, Invalid=6076, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:56:59,041 INFO L87 Difference]: Start difference. First operand 248 states and 252 transitions. Second operand has 92 states, 92 states have (on average 1.5978260869565217) internal successors, (147), 91 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:06,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:06,330 INFO L93 Difference]: Finished difference Result 389 states and 399 transitions. [2021-05-06 11:57:06,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 11:57:06,332 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.5978260869565217) internal successors, (147), 91 states have internal predecessors, (147), 2 states have call successors, (3), 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 151 [2021-05-06 11:57:06,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:06,332 INFO L225 Difference]: With dead ends: 389 [2021-05-06 11:57:06,332 INFO L226 Difference]: Without dead ends: 251 [2021-05-06 11:57:06,334 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10164 ImplicationChecksByTransitivity, 7346.2ms TimeCoverageRelationStatistics Valid=8340, Invalid=25332, Unknown=0, NotChecked=0, Total=33672 [2021-05-06 11:57:06,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-05-06 11:57:06,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-05-06 11:57:06,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 246 states have (on average 1.0203252032520325) internal successors, (251), 246 states have internal predecessors, (251), 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 11:57:06,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 255 transitions. [2021-05-06 11:57:06,365 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 255 transitions. Word has length 151 [2021-05-06 11:57:06,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:06,366 INFO L480 AbstractCegarLoop]: Abstraction has 251 states and 255 transitions. [2021-05-06 11:57:06,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 92 states have (on average 1.5978260869565217) internal successors, (147), 91 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:06,366 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 255 transitions. [2021-05-06 11:57:06,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-05-06 11:57:06,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:06,367 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:06,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 11:57:06,367 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:06,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:06,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1310035198, now seen corresponding path program 43 times [2021-05-06 11:57:06,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:06,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678150644] [2021-05-06 11:57:06,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:06,375 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:06,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:06,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:06,411 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:06,425 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,431 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:06,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:06,451 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:06,458 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,459 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:06,462 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:06,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:06,476 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:06,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,486 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:06,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:06,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:06,518 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:06,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,533 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:06,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:07,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:07,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:07,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:09,296 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:09,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678150644] [2021-05-06 11:57:09,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1678150644] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:09,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:09,296 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:57:09,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301991761] [2021-05-06 11:57:09,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:57:09,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:09,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:57:09,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2987, Invalid=6325, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:57:09,297 INFO L87 Difference]: Start difference. First operand 251 states and 255 transitions. Second operand has 94 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 93 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:16,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:16,899 INFO L93 Difference]: Finished difference Result 393 states and 403 transitions. [2021-05-06 11:57:16,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 11:57:16,900 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 93 states have internal predecessors, (150), 2 states have call successors, (3), 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 154 [2021-05-06 11:57:16,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:16,901 INFO L225 Difference]: With dead ends: 393 [2021-05-06 11:57:16,901 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 11:57:16,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10625 ImplicationChecksByTransitivity, 7670.9ms TimeCoverageRelationStatistics Valid=8734, Invalid=26422, Unknown=0, NotChecked=0, Total=35156 [2021-05-06 11:57:16,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 11:57:16,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 254. [2021-05-06 11:57:16,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 249 states have (on average 1.0200803212851406) internal successors, (254), 249 states have internal predecessors, (254), 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 11:57:16,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 258 transitions. [2021-05-06 11:57:16,934 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 258 transitions. Word has length 154 [2021-05-06 11:57:16,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:16,934 INFO L480 AbstractCegarLoop]: Abstraction has 254 states and 258 transitions. [2021-05-06 11:57:16,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 93 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:16,934 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 258 transitions. [2021-05-06 11:57:16,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 11:57:16,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:16,935 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:16,935 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 11:57:16,935 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:16,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:16,936 INFO L82 PathProgramCache]: Analyzing trace with hash 60238208, now seen corresponding path program 44 times [2021-05-06 11:57:16,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:16,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623755590] [2021-05-06 11:57:16,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:16,943 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:16,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,945 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,953 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:16,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:16,979 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:16,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,998 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:16,999 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:17,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:17,032 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:17,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:17,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:17,043 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:17,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:17,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:17,059 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:17,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:17,071 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:17,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:17,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:17,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:17,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:17,105 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:17,120 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:17,120 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:17,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:18,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:18,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:18,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:18,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:19,983 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:19,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623755590] [2021-05-06 11:57:19,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [623755590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:19,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:19,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2021-05-06 11:57:19,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570582909] [2021-05-06 11:57:19,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2021-05-06 11:57:19,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:19,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-05-06 11:57:19,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3123, Invalid=6579, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:57:19,985 INFO L87 Difference]: Start difference. First operand 254 states and 258 transitions. Second operand has 96 states, 96 states have (on average 1.59375) internal successors, (153), 95 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:27,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:27,705 INFO L93 Difference]: Finished difference Result 397 states and 407 transitions. [2021-05-06 11:57:27,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-06 11:57:27,705 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.59375) internal successors, (153), 95 states have internal predecessors, (153), 2 states have call successors, (3), 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 157 [2021-05-06 11:57:27,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:27,706 INFO L225 Difference]: With dead ends: 397 [2021-05-06 11:57:27,706 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 11:57:27,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11096 ImplicationChecksByTransitivity, 7962.4ms TimeCoverageRelationStatistics Valid=9137, Invalid=27535, Unknown=0, NotChecked=0, Total=36672 [2021-05-06 11:57:27,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 11:57:27,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2021-05-06 11:57:27,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 252 states have (on average 1.0198412698412698) internal successors, (257), 252 states have internal predecessors, (257), 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 11:57:27,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 261 transitions. [2021-05-06 11:57:27,734 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 261 transitions. Word has length 157 [2021-05-06 11:57:27,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:27,734 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 261 transitions. [2021-05-06 11:57:27,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 96 states, 96 states have (on average 1.59375) internal successors, (153), 95 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:27,734 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 261 transitions. [2021-05-06 11:57:27,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-05-06 11:57:27,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:27,735 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:27,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 11:57:27,735 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:27,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:27,735 INFO L82 PathProgramCache]: Analyzing trace with hash -953944920, now seen corresponding path program 45 times [2021-05-06 11:57:27,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:27,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290151863] [2021-05-06 11:57:27,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:27,742 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:27,759 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:27,761 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:27,770 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:27,772 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:27,783 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:27,801 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:27,804 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:27,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:27,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:27,820 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:27,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:27,829 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:27,831 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:27,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:27,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:27,848 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:27,857 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:27,861 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:27,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:27,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:27,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:27,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:27,901 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:27,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:27,919 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:27,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:28,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:28,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:30,748 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:30,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290151863] [2021-05-06 11:57:30,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1290151863] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:30,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:30,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:57:30,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589595610] [2021-05-06 11:57:30,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:57:30,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:30,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:57:30,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3320, Invalid=6780, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:57:30,750 INFO L87 Difference]: Start difference. First operand 257 states and 261 transitions. Second operand has 98 states, 98 states have (on average 1.5918367346938775) internal successors, (156), 97 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:38,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:38,968 INFO L93 Difference]: Finished difference Result 401 states and 411 transitions. [2021-05-06 11:57:38,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 11:57:38,968 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.5918367346938775) internal successors, (156), 97 states have internal predecessors, (156), 2 states have call successors, (3), 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 160 [2021-05-06 11:57:38,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:38,969 INFO L225 Difference]: With dead ends: 401 [2021-05-06 11:57:38,969 INFO L226 Difference]: Without dead ends: 260 [2021-05-06 11:57:38,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11583 ImplicationChecksByTransitivity, 8202.3ms TimeCoverageRelationStatistics Valid=9665, Invalid=28555, Unknown=0, NotChecked=0, Total=38220 [2021-05-06 11:57:38,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-06 11:57:38,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 260. [2021-05-06 11:57:38,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 255 states have (on average 1.0196078431372548) internal successors, (260), 255 states have internal predecessors, (260), 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 11:57:38,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 264 transitions. [2021-05-06 11:57:38,994 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 264 transitions. Word has length 160 [2021-05-06 11:57:38,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:38,994 INFO L480 AbstractCegarLoop]: Abstraction has 260 states and 264 transitions. [2021-05-06 11:57:38,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 1.5918367346938775) internal successors, (156), 97 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:38,994 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 264 transitions. [2021-05-06 11:57:38,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 11:57:38,995 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:38,995 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:38,995 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 11:57:38,995 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:38,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:38,995 INFO L82 PathProgramCache]: Analyzing trace with hash 671254230, now seen corresponding path program 46 times [2021-05-06 11:57:38,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:38,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904843896] [2021-05-06 11:57:38,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:39,003 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:39,019 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:39,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:39,043 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:39,059 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,062 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:39,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:39,077 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:39,086 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,086 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:39,088 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:39,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:39,105 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:39,113 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,117 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:39,133 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:39,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:39,156 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:39,173 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,174 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:39,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:40,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:40,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:40,163 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:40,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:42,088 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:42,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904843896] [2021-05-06 11:57:42,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [904843896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:42,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:42,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 11:57:42,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828021612] [2021-05-06 11:57:42,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 11:57:42,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:42,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 11:57:42,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3463, Invalid=7043, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:57:42,089 INFO L87 Difference]: Start difference. First operand 260 states and 264 transitions. Second operand has 100 states, 100 states have (on average 1.59) internal successors, (159), 99 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:50,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:50,558 INFO L93 Difference]: Finished difference Result 405 states and 415 transitions. [2021-05-06 11:57:50,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-06 11:57:50,558 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.59) internal successors, (159), 99 states have internal predecessors, (159), 2 states have call successors, (3), 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 163 [2021-05-06 11:57:50,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:50,559 INFO L225 Difference]: With dead ends: 405 [2021-05-06 11:57:50,559 INFO L226 Difference]: Without dead ends: 263 [2021-05-06 11:57:50,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12074 ImplicationChecksByTransitivity, 8421.3ms TimeCoverageRelationStatistics Valid=10088, Invalid=29712, Unknown=0, NotChecked=0, Total=39800 [2021-05-06 11:57:50,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-05-06 11:57:50,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2021-05-06 11:57:50,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 258 states have (on average 1.0193798449612403) internal successors, (263), 258 states have internal predecessors, (263), 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 11:57:50,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 267 transitions. [2021-05-06 11:57:50,589 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 267 transitions. Word has length 163 [2021-05-06 11:57:50,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:50,589 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 267 transitions. [2021-05-06 11:57:50,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 100 states have (on average 1.59) internal successors, (159), 99 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:50,589 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 267 transitions. [2021-05-06 11:57:50,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-05-06 11:57:50,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:50,590 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:50,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 11:57:50,590 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:50,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:50,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1667783250, now seen corresponding path program 47 times [2021-05-06 11:57:50,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:50,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896238811] [2021-05-06 11:57:50,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:50,598 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:50,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:50,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:50,636 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:50,659 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,662 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:50,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:50,677 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:50,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,685 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:50,687 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:50,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:50,700 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:50,708 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,711 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:50,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:50,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:50,741 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:50,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,756 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:50,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:51,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:51,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:51,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:51,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:53,775 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:53,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896238811] [2021-05-06 11:57:53,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [896238811] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:53,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:53,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2021-05-06 11:57:53,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934302325] [2021-05-06 11:57:53,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2021-05-06 11:57:53,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:53,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-05-06 11:57:53,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3609, Invalid=7311, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:57:53,777 INFO L87 Difference]: Start difference. First operand 263 states and 267 transitions. Second operand has 102 states, 102 states have (on average 1.588235294117647) internal successors, (162), 101 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:02,558 INFO L93 Difference]: Finished difference Result 409 states and 419 transitions. [2021-05-06 11:58:02,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-06 11:58:02,558 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.588235294117647) internal successors, (162), 101 states have internal predecessors, (162), 2 states have call successors, (3), 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 166 [2021-05-06 11:58:02,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:02,559 INFO L225 Difference]: With dead ends: 409 [2021-05-06 11:58:02,559 INFO L226 Difference]: Without dead ends: 266 [2021-05-06 11:58:02,560 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12575 ImplicationChecksByTransitivity, 8723.5ms TimeCoverageRelationStatistics Valid=10520, Invalid=30892, Unknown=0, NotChecked=0, Total=41412 [2021-05-06 11:58:02,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-06 11:58:02,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 266. [2021-05-06 11:58:02,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 261 states have (on average 1.0191570881226053) internal successors, (266), 261 states have internal predecessors, (266), 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 11:58:02,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 270 transitions. [2021-05-06 11:58:02,593 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 270 transitions. Word has length 166 [2021-05-06 11:58:02,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:02,594 INFO L480 AbstractCegarLoop]: Abstraction has 266 states and 270 transitions. [2021-05-06 11:58:02,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 102 states, 102 states have (on average 1.588235294117647) internal successors, (162), 101 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,594 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 270 transitions. [2021-05-06 11:58:02,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-06 11:58:02,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:02,595 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:02,595 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 11:58:02,595 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:02,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:02,595 INFO L82 PathProgramCache]: Analyzing trace with hash -175319508, now seen corresponding path program 48 times [2021-05-06 11:58:02,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:02,595 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549819056] [2021-05-06 11:58:02,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:02,602 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:02,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:02,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:02,640 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:02,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,659 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:02,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:02,676 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:02,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,684 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,689 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:02,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:02,703 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:02,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,727 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:02,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:02,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:02,763 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:02,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:03,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:03,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:03,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:03,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:05,910 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:05,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549819056] [2021-05-06 11:58:05,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [549819056] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:05,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:05,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2021-05-06 11:58:05,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226390501] [2021-05-06 11:58:05,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2021-05-06 11:58:05,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:05,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-05-06 11:58:05,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3697, Invalid=7645, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:58:05,912 INFO L87 Difference]: Start difference. First operand 266 states and 270 transitions. Second operand has 104 states, 104 states have (on average 1.5865384615384615) internal successors, (165), 103 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:14,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:14,804 INFO L93 Difference]: Finished difference Result 413 states and 423 transitions. [2021-05-06 11:58:14,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-06 11:58:14,804 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.5865384615384615) internal successors, (165), 103 states have internal predecessors, (165), 2 states have call successors, (3), 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 169 [2021-05-06 11:58:14,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:14,805 INFO L225 Difference]: With dead ends: 413 [2021-05-06 11:58:14,805 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 11:58:14,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13080 ImplicationChecksByTransitivity, 9005.8ms TimeCoverageRelationStatistics Valid=10839, Invalid=32217, Unknown=0, NotChecked=0, Total=43056 [2021-05-06 11:58:14,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 11:58:14,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2021-05-06 11:58:14,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 264 states have (on average 1.018939393939394) internal successors, (269), 264 states have internal predecessors, (269), 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 11:58:14,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 273 transitions. [2021-05-06 11:58:14,829 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 273 transitions. Word has length 169 [2021-05-06 11:58:14,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:14,829 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 273 transitions. [2021-05-06 11:58:14,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 104 states, 104 states have (on average 1.5865384615384615) internal successors, (165), 103 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:14,830 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 273 transitions. [2021-05-06 11:58:14,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-05-06 11:58:14,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:14,831 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:14,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 11:58:14,831 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:14,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:14,831 INFO L82 PathProgramCache]: Analyzing trace with hash -964108804, now seen corresponding path program 49 times [2021-05-06 11:58:14,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:14,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [679134754] [2021-05-06 11:58:14,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:14,837 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:14,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,847 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:14,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:14,869 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:14,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,885 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:14,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:14,899 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:14,906 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,907 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:14,909 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:14,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:14,922 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:14,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,933 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:14,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:14,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:14,970 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:14,984 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,986 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:15,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:16,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:16,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:16,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:16,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:19,381 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:19,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [679134754] [2021-05-06 11:58:19,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [679134754] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:19,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:19,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2021-05-06 11:58:19,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174168024] [2021-05-06 11:58:19,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 106 states [2021-05-06 11:58:19,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:19,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-05-06 11:58:19,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=10587, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:58:19,383 INFO L87 Difference]: Start difference. First operand 269 states and 273 transitions. Second operand has 106 states, 106 states have (on average 1.5849056603773586) internal successors, (168), 105 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:28,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:28,814 INFO L93 Difference]: Finished difference Result 416 states and 425 transitions. [2021-05-06 11:58:28,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:58:28,815 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.5849056603773586) internal successors, (168), 105 states have internal predecessors, (168), 2 states have call successors, (3), 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 172 [2021-05-06 11:58:28,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:28,816 INFO L225 Difference]: With dead ends: 416 [2021-05-06 11:58:28,816 INFO L226 Difference]: Without dead ends: 271 [2021-05-06 11:58:28,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4875 ImplicationChecksByTransitivity, 8760.5ms TimeCoverageRelationStatistics Valid=1489, Invalid=26903, Unknown=0, NotChecked=0, Total=28392 [2021-05-06 11:58:28,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-05-06 11:58:28,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 271. [2021-05-06 11:58:28,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 266 states have (on average 1.018796992481203) internal successors, (271), 266 states have internal predecessors, (271), 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 11:58:28,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 275 transitions. [2021-05-06 11:58:28,839 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 275 transitions. Word has length 172 [2021-05-06 11:58:28,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:28,839 INFO L480 AbstractCegarLoop]: Abstraction has 271 states and 275 transitions. [2021-05-06 11:58:28,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 106 states, 106 states have (on average 1.5849056603773586) internal successors, (168), 105 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:28,839 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 275 transitions. [2021-05-06 11:58:28,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-05-06 11:58:28,840 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:28,840 INFO L523 BasicCegarLoop]: trace histogram [60, 59, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:28,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 11:58:28,840 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:28,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:28,840 INFO L82 PathProgramCache]: Analyzing trace with hash 711445505, now seen corresponding path program 50 times [2021-05-06 11:58:28,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:28,840 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121125054] [2021-05-06 11:58:28,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:28,846 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:28,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:28,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:28,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:28,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:28,879 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:28,893 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:28,895 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:28,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:28,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:28,909 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:28,916 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:28,917 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:28,918 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:28,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:28,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:28,932 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:28,939 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:28,943 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:28,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:28,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:28,957 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:28,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:28,980 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:28,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:28,996 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:29,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:29,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:29,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:29,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:29,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:29,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:32,251 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:32,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121125054] [2021-05-06 11:58:32,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2121125054] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:32,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:32,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [107] imperfect sequences [] total 107 [2021-05-06 11:58:32,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702823299] [2021-05-06 11:58:32,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 107 states [2021-05-06 11:58:32,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:32,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-05-06 11:58:32,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3797, Invalid=7545, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:58:32,257 INFO L87 Difference]: Start difference. First operand 271 states and 275 transitions. Second operand has 107 states, 107 states have (on average 1.588785046728972) internal successors, (170), 106 states have internal predecessors, (170), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:41,814 INFO L93 Difference]: Finished difference Result 443 states and 477 transitions. [2021-05-06 11:58:41,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-05-06 11:58:41,814 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.588785046728972) internal successors, (170), 106 states have internal predecessors, (170), 2 states have call successors, (3), 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 174 [2021-05-06 11:58:41,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:41,815 INFO L225 Difference]: With dead ends: 443 [2021-05-06 11:58:41,815 INFO L226 Difference]: Without dead ends: 298 [2021-05-06 11:58:41,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13186 ImplicationChecksByTransitivity, 9466.8ms TimeCoverageRelationStatistics Valid=11385, Invalid=32925, Unknown=0, NotChecked=0, Total=44310 [2021-05-06 11:58:41,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-06 11:58:41,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 180. [2021-05-06 11:58:41,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.022857142857143) internal successors, (179), 175 states have internal predecessors, (179), 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 11:58:41,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 183 transitions. [2021-05-06 11:58:41,832 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 183 transitions. Word has length 174 [2021-05-06 11:58:41,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:41,832 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 183 transitions. [2021-05-06 11:58:41,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 107 states, 107 states have (on average 1.588785046728972) internal successors, (170), 106 states have internal predecessors, (170), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,832 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 183 transitions. [2021-05-06 11:58:41,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 11:58:41,833 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:41,833 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:41,833 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 11:58:41,833 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:41,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:41,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1189962632, now seen corresponding path program 51 times [2021-05-06 11:58:41,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:41,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166800895] [2021-05-06 11:58:41,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:41,839 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:41,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:41,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:41,869 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:41,884 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,886 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:41,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:41,899 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:41,906 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,908 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:41,909 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:41,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:41,923 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:41,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,933 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:41,946 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:41,970 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:41,990 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:42,009 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:42,010 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:42,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:43,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:43,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:43,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:43,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:43,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:45,389 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:45,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166800895] [2021-05-06 11:58:45,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [166800895] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:45,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:45,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [111] imperfect sequences [] total 111 [2021-05-06 11:58:45,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951011314] [2021-05-06 11:58:45,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 111 states [2021-05-06 11:58:45,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:45,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-05-06 11:58:45,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4106, Invalid=8104, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:58:45,391 INFO L87 Difference]: Start difference. First operand 180 states and 183 transitions. Second operand has 111 states, 111 states have (on average 1.5765765765765767) internal successors, (175), 110 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:55,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:55,476 INFO L93 Difference]: Finished difference Result 358 states and 370 transitions. [2021-05-06 11:58:55,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-05-06 11:58:55,476 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.5765765765765767) internal successors, (175), 110 states have internal predecessors, (175), 2 states have call successors, (3), 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 179 [2021-05-06 11:58:55,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:55,477 INFO L225 Difference]: With dead ends: 358 [2021-05-06 11:58:55,477 INFO L226 Difference]: Without dead ends: 186 [2021-05-06 11:58:55,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14200 ImplicationChecksByTransitivity, 10015.2ms TimeCoverageRelationStatistics Valid=12312, Invalid=35430, Unknown=0, NotChecked=0, Total=47742 [2021-05-06 11:58:55,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-06 11:58:55,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2021-05-06 11:58:55,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 181 states have (on average 1.022099447513812) internal successors, (185), 181 states have internal predecessors, (185), 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 11:58:55,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 189 transitions. [2021-05-06 11:58:55,503 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 189 transitions. Word has length 179 [2021-05-06 11:58:55,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:55,503 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 189 transitions. [2021-05-06 11:58:55,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 111 states, 111 states have (on average 1.5765765765765767) internal successors, (175), 110 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:55,503 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 189 transitions. [2021-05-06 11:58:55,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-05-06 11:58:55,504 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:55,504 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:55,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 11:58:55,505 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:55,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:55,505 INFO L82 PathProgramCache]: Analyzing trace with hash -1732616370, now seen corresponding path program 52 times [2021-05-06 11:58:55,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:55,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39909702] [2021-05-06 11:58:55,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:55,512 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:55,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:55,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:55,551 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:55,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,568 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:55,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:55,581 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:55,589 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,590 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:55,591 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:55,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:55,605 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:55,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,616 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:55,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:55,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:55,647 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:55,662 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:55,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:56,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:56,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:56,884 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:56,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:59,445 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:59,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39909702] [2021-05-06 11:58:59,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [39909702] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:59,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:59,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2021-05-06 11:58:59,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636646171] [2021-05-06 11:58:59,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2021-05-06 11:58:59,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:59,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-05-06 11:58:59,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4417, Invalid=9155, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:58:59,447 INFO L87 Difference]: Start difference. First operand 186 states and 189 transitions. Second operand has 114 states, 114 states have (on average 1.587719298245614) internal successors, (181), 113 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:10,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:10,077 INFO L93 Difference]: Finished difference Result 493 states and 504 transitions. [2021-05-06 11:59:10,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-06 11:59:10,077 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.587719298245614) internal successors, (181), 113 states have internal predecessors, (181), 2 states have call successors, (3), 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 185 [2021-05-06 11:59:10,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:10,078 INFO L225 Difference]: With dead ends: 493 [2021-05-06 11:59:10,078 INFO L226 Difference]: Without dead ends: 315 [2021-05-06 11:59:10,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15731 ImplicationChecksByTransitivity, 10716.7ms TimeCoverageRelationStatistics Valid=12977, Invalid=38779, Unknown=0, NotChecked=0, Total=51756 [2021-05-06 11:59:10,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-05-06 11:59:10,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 315. [2021-05-06 11:59:10,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 310 states have (on average 1.0161290322580645) internal successors, (315), 310 states have internal predecessors, (315), 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 11:59:10,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 319 transitions. [2021-05-06 11:59:10,108 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 319 transitions. Word has length 185 [2021-05-06 11:59:10,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:10,108 INFO L480 AbstractCegarLoop]: Abstraction has 315 states and 319 transitions. [2021-05-06 11:59:10,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 114 states, 114 states have (on average 1.587719298245614) internal successors, (181), 113 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:10,108 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 319 transitions. [2021-05-06 11:59:10,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-06 11:59:10,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:10,109 INFO L523 BasicCegarLoop]: trace histogram [65, 64, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:10,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 11:59:10,109 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:10,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:10,110 INFO L82 PathProgramCache]: Analyzing trace with hash -2044768486, now seen corresponding path program 53 times [2021-05-06 11:59:10,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:10,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183876855] [2021-05-06 11:59:10,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:10,126 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:10,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:10,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:10,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:10,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:10,161 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:10,176 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:10,184 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:10,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:10,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:10,197 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:10,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:10,206 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:10,214 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:10,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:10,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:10,233 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:10,243 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:10,247 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:10,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:10,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:10,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:10,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:10,286 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:10,300 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:10,301 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:10,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:11,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:11,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:11,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:11,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:15,367 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:15,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183876855] [2021-05-06 11:59:15,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1183876855] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:15,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:15,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2021-05-06 11:59:15,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692669658] [2021-05-06 11:59:15,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2021-05-06 11:59:15,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:15,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-05-06 11:59:15,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1389, Invalid=12653, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:59:15,369 INFO L87 Difference]: Start difference. First operand 315 states and 319 transitions. Second operand has 116 states, 116 states have (on average 1.5862068965517242) internal successors, (184), 115 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:26,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:26,563 INFO L93 Difference]: Finished difference Result 496 states and 505 transitions. [2021-05-06 11:59:26,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:59:26,564 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.5862068965517242) internal successors, (184), 115 states have internal predecessors, (184), 2 states have call successors, (3), 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 188 [2021-05-06 11:59:26,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:26,564 INFO L225 Difference]: With dead ends: 496 [2021-05-06 11:59:26,565 INFO L226 Difference]: Without dead ends: 317 [2021-05-06 11:59:26,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5824 ImplicationChecksByTransitivity, 10211.5ms TimeCoverageRelationStatistics Valid=1723, Invalid=32317, Unknown=0, NotChecked=0, Total=34040 [2021-05-06 11:59:26,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-06 11:59:26,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2021-05-06 11:59:26,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 312 states have (on average 1.016025641025641) internal successors, (317), 312 states have internal predecessors, (317), 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 11:59:26,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 321 transitions. [2021-05-06 11:59:26,598 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 321 transitions. Word has length 188 [2021-05-06 11:59:26,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:26,599 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 321 transitions. [2021-05-06 11:59:26,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 116 states, 116 states have (on average 1.5862068965517242) internal successors, (184), 115 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:26,599 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 321 transitions. [2021-05-06 11:59:26,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-05-06 11:59:26,599 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:26,600 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:26,600 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2021-05-06 11:59:26,600 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:26,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:26,600 INFO L82 PathProgramCache]: Analyzing trace with hash -306998497, now seen corresponding path program 54 times [2021-05-06 11:59:26,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:26,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788482179] [2021-05-06 11:59:26,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:26,608 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:26,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:26,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:26,642 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:26,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,659 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:26,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:26,673 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:26,680 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,681 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:26,683 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:26,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,692 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:26,696 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:26,704 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,707 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:26,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:26,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:26,737 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:26,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,752 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:26,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:27,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:27,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:27,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:27,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:30,542 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:30,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788482179] [2021-05-06 11:59:30,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [788482179] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:30,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:30,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [117] imperfect sequences [] total 117 [2021-05-06 11:59:30,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444717213] [2021-05-06 11:59:30,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 117 states [2021-05-06 11:59:30,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:30,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-05-06 11:59:30,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4701, Invalid=9579, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 11:59:30,544 INFO L87 Difference]: Start difference. First operand 317 states and 321 transitions. Second operand has 117 states, 117 states have (on average 1.5897435897435896) internal successors, (186), 116 states have internal predecessors, (186), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:41,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:41,796 INFO L93 Difference]: Finished difference Result 499 states and 509 transitions. [2021-05-06 11:59:41,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-05-06 11:59:41,797 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.5897435897435896) internal successors, (186), 116 states have internal predecessors, (186), 2 states have call successors, (3), 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 190 [2021-05-06 11:59:41,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:41,797 INFO L225 Difference]: With dead ends: 499 [2021-05-06 11:59:41,798 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 11:59:41,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16568 ImplicationChecksByTransitivity, 11080.8ms TimeCoverageRelationStatistics Valid=13754, Invalid=40768, Unknown=0, NotChecked=0, Total=54522 [2021-05-06 11:59:41,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 11:59:41,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 320. [2021-05-06 11:59:41,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 315 states have (on average 1.0158730158730158) internal successors, (320), 315 states have internal predecessors, (320), 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 11:59:41,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 324 transitions. [2021-05-06 11:59:41,829 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 324 transitions. Word has length 190 [2021-05-06 11:59:41,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:41,829 INFO L480 AbstractCegarLoop]: Abstraction has 320 states and 324 transitions. [2021-05-06 11:59:41,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 117 states, 117 states have (on average 1.5897435897435896) internal successors, (186), 116 states have internal predecessors, (186), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:41,830 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 324 transitions. [2021-05-06 11:59:41,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-06 11:59:41,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:41,830 INFO L523 BasicCegarLoop]: trace histogram [67, 66, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:41,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 11:59:41,831 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:41,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:41,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1773442559, now seen corresponding path program 55 times [2021-05-06 11:59:41,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:41,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318444018] [2021-05-06 11:59:41,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:41,838 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:41,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:41,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:41,872 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:41,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,888 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:41,889 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:41,901 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:41,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,909 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:41,919 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:41,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,929 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:41,933 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:41,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,943 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:41,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:41,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:41,982 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:41,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,997 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:42,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:43,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:43,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:43,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:43,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:47,310 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:47,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318444018] [2021-05-06 11:59:47,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1318444018] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:47,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:47,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [119] imperfect sequences [] total 119 [2021-05-06 11:59:47,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063801649] [2021-05-06 11:59:47,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 119 states [2021-05-06 11:59:47,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:47,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-05-06 11:59:47,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1444, Invalid=13318, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:59:47,312 INFO L87 Difference]: Start difference. First operand 320 states and 324 transitions. Second operand has 119 states, 119 states have (on average 1.588235294117647) internal successors, (189), 118 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:59,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:59,125 INFO L93 Difference]: Finished difference Result 502 states and 511 transitions. [2021-05-06 11:59:59,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:59:59,125 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.588235294117647) internal successors, (189), 118 states have internal predecessors, (189), 2 states have call successors, (3), 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 193 [2021-05-06 11:59:59,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:59,126 INFO L225 Difference]: With dead ends: 502 [2021-05-06 11:59:59,126 INFO L226 Difference]: Without dead ends: 322 [2021-05-06 11:59:59,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6135 ImplicationChecksByTransitivity, 10730.3ms TimeCoverageRelationStatistics Valid=1788, Invalid=34122, Unknown=0, NotChecked=0, Total=35910 [2021-05-06 11:59:59,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-05-06 11:59:59,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 322. [2021-05-06 11:59:59,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 317 states have (on average 1.0157728706624605) internal successors, (322), 317 states have internal predecessors, (322), 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 11:59:59,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 326 transitions. [2021-05-06 11:59:59,157 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 326 transitions. Word has length 193 [2021-05-06 11:59:59,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:59,157 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 326 transitions. [2021-05-06 11:59:59,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 119 states, 119 states have (on average 1.588235294117647) internal successors, (189), 118 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:59,157 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 326 transitions. [2021-05-06 11:59:59,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-05-06 11:59:59,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:59,158 INFO L523 BasicCegarLoop]: trace histogram [68, 67, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:59,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2021-05-06 11:59:59,158 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:59,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:59,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1330442982, now seen corresponding path program 56 times [2021-05-06 11:59:59,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:59,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113597378] [2021-05-06 11:59:59,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:59,172 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:59,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:59,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:59,185 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:59,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:59,207 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:59,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:59,224 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:59,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:59,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:59,237 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:59,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:59,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:59,247 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:59,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:59,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:59,262 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:59,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:59,272 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:59,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:59,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:59,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:59,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:59,304 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:59,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:59,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:59,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:00,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:00,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:00,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:00,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:00,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:03,364 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:03,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113597378] [2021-05-06 12:00:03,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2113597378] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:03,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:03,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [121] imperfect sequences [] total 121 [2021-05-06 12:00:03,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17707725] [2021-05-06 12:00:03,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 121 states [2021-05-06 12:00:03,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:03,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-05-06 12:00:03,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4864, Invalid=9656, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 12:00:03,366 INFO L87 Difference]: Start difference. First operand 322 states and 326 transitions. Second operand has 121 states, 121 states have (on average 1.578512396694215) internal successors, (191), 120 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:15,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:15,343 INFO L93 Difference]: Finished difference Result 516 states and 537 transitions. [2021-05-06 12:00:15,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-05-06 12:00:15,344 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.578512396694215) internal successors, (191), 120 states have internal predecessors, (191), 2 states have call successors, (3), 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 195 [2021-05-06 12:00:15,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:15,344 INFO L225 Difference]: With dead ends: 516 [2021-05-06 12:00:15,344 INFO L226 Difference]: Without dead ends: 336 [2021-05-06 12:00:15,347 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16955 ImplicationChecksByTransitivity, 11838.8ms TimeCoverageRelationStatistics Valid=14586, Invalid=42296, Unknown=0, NotChecked=0, Total=56882 [2021-05-06 12:00:15,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-05-06 12:00:15,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 202. [2021-05-06 12:00:15,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0203045685279188) internal successors, (201), 197 states have internal predecessors, (201), 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 12:00:15,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 205 transitions. [2021-05-06 12:00:15,368 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 205 transitions. Word has length 195 [2021-05-06 12:00:15,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:15,368 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 205 transitions. [2021-05-06 12:00:15,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 121 states, 121 states have (on average 1.578512396694215) internal successors, (191), 120 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:15,368 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 205 transitions. [2021-05-06 12:00:15,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-05-06 12:00:15,369 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:15,369 INFO L523 BasicCegarLoop]: trace histogram [70, 69, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:15,369 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2021-05-06 12:00:15,369 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:15,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:15,370 INFO L82 PathProgramCache]: Analyzing trace with hash -458914960, now seen corresponding path program 57 times [2021-05-06 12:00:15,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:15,370 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472424896] [2021-05-06 12:00:15,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:15,380 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:15,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:15,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:15,421 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:15,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:15,452 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:15,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:15,468 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:15,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:15,477 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:15,479 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:15,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:15,493 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:15,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:15,507 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:15,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:15,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:15,543 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:15,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:15,559 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:15,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:16,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:16,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:16,817 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 12:00:16,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:16,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:19,864 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:19,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472424896] [2021-05-06 12:00:19,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [472424896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:19,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:19,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [124] imperfect sequences [] total 124 [2021-05-06 12:00:19,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801409861] [2021-05-06 12:00:19,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 124 states [2021-05-06 12:00:19,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:19,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-05-06 12:00:19,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5090, Invalid=10162, Unknown=0, NotChecked=0, Total=15252 [2021-05-06 12:00:19,866 INFO L87 Difference]: Start difference. First operand 202 states and 205 transitions. Second operand has 124 states, 124 states have (on average 1.5887096774193548) internal successors, (197), 123 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:32,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:32,407 INFO L93 Difference]: Finished difference Result 401 states and 412 transitions. [2021-05-06 12:00:32,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-05-06 12:00:32,408 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.5887096774193548) internal successors, (197), 123 states have internal predecessors, (197), 2 states have call successors, (3), 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 201 [2021-05-06 12:00:32,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:32,409 INFO L225 Difference]: With dead ends: 401 [2021-05-06 12:00:32,409 INFO L226 Difference]: Without dead ends: 207 [2021-05-06 12:00:32,411 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17865 ImplicationChecksByTransitivity, 12437.0ms TimeCoverageRelationStatistics Valid=15264, Invalid=44516, Unknown=0, NotChecked=0, Total=59780 [2021-05-06 12:00:32,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-05-06 12:00:32,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2021-05-06 12:00:32,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 202 states have (on average 1.0198019801980198) internal successors, (206), 202 states have internal predecessors, (206), 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 12:00:32,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 210 transitions. [2021-05-06 12:00:32,439 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 210 transitions. Word has length 201 [2021-05-06 12:00:32,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:32,439 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 210 transitions. [2021-05-06 12:00:32,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 124 states, 124 states have (on average 1.5887096774193548) internal successors, (197), 123 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:32,439 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 210 transitions. [2021-05-06 12:00:32,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-05-06 12:00:32,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:32,440 INFO L523 BasicCegarLoop]: trace histogram [72, 71, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:32,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-05-06 12:00:32,440 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:32,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:32,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1038278851, now seen corresponding path program 58 times [2021-05-06 12:00:32,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:32,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154714563] [2021-05-06 12:00:32,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:32,449 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:32,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:32,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:32,486 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:32,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,503 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:32,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:32,517 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:32,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,525 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:32,527 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:32,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:32,540 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:32,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,551 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:32,551 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:32,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:32,583 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:32,597 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,598 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:32,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:33,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:33,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:33,949 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:33,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:33,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:37,007 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:37,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154714563] [2021-05-06 12:00:37,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1154714563] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:37,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:37,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [127] imperfect sequences [] total 127 [2021-05-06 12:00:37,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283866651] [2021-05-06 12:00:37,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 127 states [2021-05-06 12:00:37,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:37,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-05-06 12:00:37,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=10681, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 12:00:37,009 INFO L87 Difference]: Start difference. First operand 207 states and 210 transitions. Second operand has 127 states, 127 states have (on average 1.5905511811023623) internal successors, (202), 126 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:50,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:50,191 INFO L93 Difference]: Finished difference Result 411 states and 422 transitions. [2021-05-06 12:00:50,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-05-06 12:00:50,191 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.5905511811023623) internal successors, (202), 126 states have internal predecessors, (202), 2 states have call successors, (3), 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 206 [2021-05-06 12:00:50,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:50,192 INFO L225 Difference]: With dead ends: 411 [2021-05-06 12:00:50,192 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 12:00:50,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18698 ImplicationChecksByTransitivity, 13028.2ms TimeCoverageRelationStatistics Valid=15957, Invalid=46793, Unknown=0, NotChecked=0, Total=62750 [2021-05-06 12:00:50,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 12:00:50,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-05-06 12:00:50,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 207 states have (on average 1.0193236714975846) internal successors, (211), 207 states have internal predecessors, (211), 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 12:00:50,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 215 transitions. [2021-05-06 12:00:50,224 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 215 transitions. Word has length 206 [2021-05-06 12:00:50,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:50,224 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 215 transitions. [2021-05-06 12:00:50,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 127 states, 127 states have (on average 1.5905511811023623) internal successors, (202), 126 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:50,224 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 215 transitions. [2021-05-06 12:00:50,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-05-06 12:00:50,225 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:50,225 INFO L523 BasicCegarLoop]: trace histogram [74, 73, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:50,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-05-06 12:00:50,225 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:50,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:50,226 INFO L82 PathProgramCache]: Analyzing trace with hash 835082428, now seen corresponding path program 59 times [2021-05-06 12:00:50,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:50,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359382679] [2021-05-06 12:00:50,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:50,233 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:50,234 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:50,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:50,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:50,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:50,271 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:50,287 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:50,290 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:50,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:50,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:50,307 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:50,315 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:50,316 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:50,318 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:50,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:50,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:50,333 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:50,342 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:50,346 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:50,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:50,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:50,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:50,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:50,385 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:50,401 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:50,403 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:50,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:52,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:52,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:52,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:52,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:55,322 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:55,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359382679] [2021-05-06 12:00:55,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [359382679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:55,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:55,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [130] imperfect sequences [] total 130 [2021-05-06 12:00:55,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139449102] [2021-05-06 12:00:55,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 130 states [2021-05-06 12:00:55,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:55,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-05-06 12:00:55,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5672, Invalid=11884, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 12:00:55,325 INFO L87 Difference]: Start difference. First operand 212 states and 215 transitions. Second operand has 130 states, 130 states have (on average 1.5923076923076922) internal successors, (207), 129 states have internal predecessors, (207), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:09,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:09,415 INFO L93 Difference]: Finished difference Result 565 states and 576 transitions. [2021-05-06 12:01:09,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-05-06 12:01:09,415 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 1.5923076923076922) internal successors, (207), 129 states have internal predecessors, (207), 2 states have call successors, (3), 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 211 [2021-05-06 12:01:09,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:09,417 INFO L225 Difference]: With dead ends: 565 [2021-05-06 12:01:09,417 INFO L226 Difference]: Without dead ends: 361 [2021-05-06 12:01:09,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20453 ImplicationChecksByTransitivity, 13857.9ms TimeCoverageRelationStatistics Valid=16708, Invalid=50632, Unknown=0, NotChecked=0, Total=67340 [2021-05-06 12:01:09,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2021-05-06 12:01:09,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 361. [2021-05-06 12:01:09,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 356 states have (on average 1.0140449438202248) internal successors, (361), 356 states have internal predecessors, (361), 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 12:01:09,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 365 transitions. [2021-05-06 12:01:09,453 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 365 transitions. Word has length 211 [2021-05-06 12:01:09,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:09,454 INFO L480 AbstractCegarLoop]: Abstraction has 361 states and 365 transitions. [2021-05-06 12:01:09,454 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 130 states, 130 states have (on average 1.5923076923076922) internal successors, (207), 129 states have internal predecessors, (207), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:09,454 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 365 transitions. [2021-05-06 12:01:09,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-05-06 12:01:09,455 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:09,455 INFO L523 BasicCegarLoop]: trace histogram [75, 74, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:09,455 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 12:01:09,455 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:09,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:09,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1578944300, now seen corresponding path program 60 times [2021-05-06 12:01:09,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:09,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589099337] [2021-05-06 12:01:09,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:09,462 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:09,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:09,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:09,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:09,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:09,495 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:09,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:09,512 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:09,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:09,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:09,542 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:09,552 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:09,553 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:09,555 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:09,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:09,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:09,571 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:09,578 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:09,581 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:09,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:09,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:09,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:09,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:09,613 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:09,627 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:09,628 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:09,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:11,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:11,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:11,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:11,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:11,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:14,257 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:14,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589099337] [2021-05-06 12:01:14,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1589099337] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:14,257 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:14,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [132] imperfect sequences [] total 132 [2021-05-06 12:01:14,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117494635] [2021-05-06 12:01:14,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 132 states [2021-05-06 12:01:14,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:14,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-05-06 12:01:14,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5742, Invalid=11550, Unknown=0, NotChecked=0, Total=17292 [2021-05-06 12:01:14,259 INFO L87 Difference]: Start difference. First operand 361 states and 365 transitions. Second operand has 132 states, 132 states have (on average 1.5909090909090908) internal successors, (210), 131 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:28,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:28,506 INFO L93 Difference]: Finished difference Result 573 states and 587 transitions. [2021-05-06 12:01:28,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-05-06 12:01:28,507 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.5909090909090908) internal successors, (210), 131 states have internal predecessors, (210), 2 states have call successors, (3), 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 214 [2021-05-06 12:01:28,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:28,508 INFO L225 Difference]: With dead ends: 573 [2021-05-06 12:01:28,508 INFO L226 Difference]: Without dead ends: 368 [2021-05-06 12:01:28,510 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20239 ImplicationChecksByTransitivity, 13899.5ms TimeCoverageRelationStatistics Valid=17220, Invalid=50640, Unknown=0, NotChecked=0, Total=67860 [2021-05-06 12:01:28,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-05-06 12:01:28,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 220. [2021-05-06 12:01:28,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 215 states have (on average 1.0186046511627906) internal successors, (219), 215 states have internal predecessors, (219), 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 12:01:28,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 223 transitions. [2021-05-06 12:01:28,530 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 223 transitions. Word has length 214 [2021-05-06 12:01:28,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:28,531 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 223 transitions. [2021-05-06 12:01:28,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 132 states, 132 states have (on average 1.5909090909090908) internal successors, (210), 131 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:28,531 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 223 transitions. [2021-05-06 12:01:28,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2021-05-06 12:01:28,531 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:28,532 INFO L523 BasicCegarLoop]: trace histogram [77, 76, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:28,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2021-05-06 12:01:28,532 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:28,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:28,532 INFO L82 PathProgramCache]: Analyzing trace with hash 796022957, now seen corresponding path program 61 times [2021-05-06 12:01:28,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:28,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892493546] [2021-05-06 12:01:28,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:28,549 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:28,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:28,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:28,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:28,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:28,579 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:28,594 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:28,596 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:28,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:28,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:28,610 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:28,617 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:28,618 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:28,621 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:28,621 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:28,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:28,637 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:28,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:28,647 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:28,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:28,662 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:28,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:28,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:28,681 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:28,695 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:28,696 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:28,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:30,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:30,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:30,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:30,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:30,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:33,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:33,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892493546] [2021-05-06 12:01:33,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1892493546] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:33,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:33,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [135] imperfect sequences [] total 135 [2021-05-06 12:01:33,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880422535] [2021-05-06 12:01:33,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 135 states [2021-05-06 12:01:33,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:33,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-05-06 12:01:33,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5987, Invalid=12103, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 12:01:33,584 INFO L87 Difference]: Start difference. First operand 220 states and 223 transitions. Second operand has 135 states, 135 states have (on average 1.5925925925925926) internal successors, (215), 134 states have internal predecessors, (215), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:48,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:48,278 INFO L93 Difference]: Finished difference Result 437 states and 448 transitions. [2021-05-06 12:01:48,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-05-06 12:01:48,278 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.5925925925925926) internal successors, (215), 134 states have internal predecessors, (215), 2 states have call successors, (3), 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 219 [2021-05-06 12:01:48,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:48,279 INFO L225 Difference]: With dead ends: 437 [2021-05-06 12:01:48,279 INFO L226 Difference]: Without dead ends: 225 [2021-05-06 12:01:48,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21178 ImplicationChecksByTransitivity, 14366.8ms TimeCoverageRelationStatistics Valid=17955, Invalid=53067, Unknown=0, NotChecked=0, Total=71022 [2021-05-06 12:01:48,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-05-06 12:01:48,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 225. [2021-05-06 12:01:48,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 220 states have (on average 1.018181818181818) internal successors, (224), 220 states have internal predecessors, (224), 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 12:01:48,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 228 transitions. [2021-05-06 12:01:48,303 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 228 transitions. Word has length 219 [2021-05-06 12:01:48,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:48,303 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 228 transitions. [2021-05-06 12:01:48,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 135 states, 135 states have (on average 1.5925925925925926) internal successors, (215), 134 states have internal predecessors, (215), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:48,303 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 228 transitions. [2021-05-06 12:01:48,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-05-06 12:01:48,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:48,304 INFO L523 BasicCegarLoop]: trace histogram [79, 78, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:48,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2021-05-06 12:01:48,305 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:48,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:48,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1284443360, now seen corresponding path program 62 times [2021-05-06 12:01:48,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:48,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276877800] [2021-05-06 12:01:48,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:48,322 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:48,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:48,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:48,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:48,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:48,361 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:48,378 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:48,381 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:48,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:48,392 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:48,397 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:48,405 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:48,406 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:48,409 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:48,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:48,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:48,422 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:48,430 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:48,433 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:48,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:48,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:48,445 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:48,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:48,476 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:48,493 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:48,494 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:48,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:50,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:50,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:50,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:50,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:50,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:53,666 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:53,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276877800] [2021-05-06 12:01:53,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1276877800] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:53,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:53,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [139] imperfect sequences [] total 139 [2021-05-06 12:01:53,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151608528] [2021-05-06 12:01:53,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 139 states [2021-05-06 12:01:53,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:53,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-05-06 12:01:53,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6374, Invalid=12808, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 12:01:53,668 INFO L87 Difference]: Start difference. First operand 225 states and 228 transitions. Second operand has 139 states, 139 states have (on average 1.5827338129496402) internal successors, (220), 138 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:09,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:09,095 INFO L93 Difference]: Finished difference Result 448 states and 460 transitions. [2021-05-06 12:02:09,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-05-06 12:02:09,096 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.5827338129496402) internal successors, (220), 138 states have internal predecessors, (220), 2 states have call successors, (3), 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 224 [2021-05-06 12:02:09,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:09,097 INFO L225 Difference]: With dead ends: 448 [2021-05-06 12:02:09,097 INFO L226 Difference]: Without dead ends: 231 [2021-05-06 12:02:09,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22514 ImplicationChecksByTransitivity, 15150.5ms TimeCoverageRelationStatistics Valid=19116, Invalid=56234, Unknown=0, NotChecked=0, Total=75350 [2021-05-06 12:02:09,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-06 12:02:09,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-05-06 12:02:09,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 226 states have (on average 1.0176991150442478) internal successors, (230), 226 states have internal predecessors, (230), 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 12:02:09,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 234 transitions. [2021-05-06 12:02:09,123 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 234 transitions. Word has length 224 [2021-05-06 12:02:09,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:09,123 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 234 transitions. [2021-05-06 12:02:09,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 139 states, 139 states have (on average 1.5827338129496402) internal successors, (220), 138 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:09,123 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 234 transitions. [2021-05-06 12:02:09,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-05-06 12:02:09,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:09,124 INFO L523 BasicCegarLoop]: trace histogram [81, 80, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:09,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable188 [2021-05-06 12:02:09,124 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:09,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:09,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1271903542, now seen corresponding path program 63 times [2021-05-06 12:02:09,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:09,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923757926] [2021-05-06 12:02:09,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:09,132 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:09,133 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:09,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:09,142 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:09,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:09,163 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:09,177 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:09,180 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:09,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:09,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:09,193 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:09,201 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:09,201 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:09,203 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:09,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:09,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:09,216 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:09,224 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:09,227 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:09,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:09,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:09,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:09,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:09,259 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:09,274 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:09,275 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:09,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:10,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:10,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:10,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:10,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:14,702 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:14,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923757926] [2021-05-06 12:02:14,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [923757926] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:14,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:14,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [142] imperfect sequences [] total 142 [2021-05-06 12:02:14,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475187796] [2021-05-06 12:02:14,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 142 states [2021-05-06 12:02:14,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:14,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2021-05-06 12:02:14,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6757, Invalid=14123, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 12:02:14,704 INFO L87 Difference]: Start difference. First operand 231 states and 234 transitions. Second operand has 142 states, 142 states have (on average 1.591549295774648) internal successors, (226), 141 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:30,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:30,981 INFO L93 Difference]: Finished difference Result 617 states and 628 transitions. [2021-05-06 12:02:30,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-05-06 12:02:30,981 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 1.591549295774648) internal successors, (226), 141 states have internal predecessors, (226), 2 states have call successors, (3), 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 230 [2021-05-06 12:02:30,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:30,983 INFO L225 Difference]: With dead ends: 617 [2021-05-06 12:02:30,983 INFO L226 Difference]: Without dead ends: 394 [2021-05-06 12:02:30,987 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24437 ImplicationChecksByTransitivity, 15749.0ms TimeCoverageRelationStatistics Valid=19936, Invalid=60436, Unknown=0, NotChecked=0, Total=80372 [2021-05-06 12:02:30,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-05-06 12:02:31,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 394. [2021-05-06 12:02:31,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 389 states have (on average 1.012853470437018) internal successors, (394), 389 states have internal predecessors, (394), 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 12:02:31,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 398 transitions. [2021-05-06 12:02:31,054 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 398 transitions. Word has length 230 [2021-05-06 12:02:31,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:31,054 INFO L480 AbstractCegarLoop]: Abstraction has 394 states and 398 transitions. [2021-05-06 12:02:31,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 142 states, 142 states have (on average 1.591549295774648) internal successors, (226), 141 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:31,054 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 398 transitions. [2021-05-06 12:02:31,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-05-06 12:02:31,055 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:31,055 INFO L523 BasicCegarLoop]: trace histogram [82, 81, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:31,056 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191 [2021-05-06 12:02:31,056 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:31,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:31,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1837196108, now seen corresponding path program 64 times [2021-05-06 12:02:31,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:31,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112351521] [2021-05-06 12:02:31,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:31,072 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:31,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:31,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:31,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:31,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:31,109 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:31,125 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:31,129 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:31,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:31,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:31,144 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:31,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:31,153 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:31,167 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:31,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:31,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:31,182 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:31,193 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:31,202 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:31,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:31,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:31,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:31,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:31,242 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:31,258 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:31,259 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:31,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:33,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:33,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:33,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:33,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:33,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:36,937 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:36,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112351521] [2021-05-06 12:02:36,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [112351521] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:36,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:36,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [144] imperfect sequences [] total 144 [2021-05-06 12:02:36,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189330003] [2021-05-06 12:02:36,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 144 states [2021-05-06 12:02:36,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:36,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-05-06 12:02:36,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6834, Invalid=13758, Unknown=0, NotChecked=0, Total=20592 [2021-05-06 12:02:36,939 INFO L87 Difference]: Start difference. First operand 394 states and 398 transitions. Second operand has 144 states, 144 states have (on average 1.5902777777777777) internal successors, (229), 143 states have internal predecessors, (229), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:53,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:53,352 INFO L93 Difference]: Finished difference Result 625 states and 639 transitions. [2021-05-06 12:02:53,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-05-06 12:02:53,352 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.5902777777777777) internal successors, (229), 143 states have internal predecessors, (229), 2 states have call successors, (3), 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 233 [2021-05-06 12:02:53,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:53,353 INFO L225 Difference]: With dead ends: 625 [2021-05-06 12:02:53,353 INFO L226 Difference]: Without dead ends: 401 [2021-05-06 12:02:53,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24259 ImplicationChecksByTransitivity, 16276.6ms TimeCoverageRelationStatistics Valid=20496, Invalid=60444, Unknown=0, NotChecked=0, Total=80940 [2021-05-06 12:02:53,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-05-06 12:02:53,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 239. [2021-05-06 12:02:53,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 234 states have (on average 1.017094017094017) internal successors, (238), 234 states have internal predecessors, (238), 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 12:02:53,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 242 transitions. [2021-05-06 12:02:53,378 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 242 transitions. Word has length 233 [2021-05-06 12:02:53,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:53,378 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 242 transitions. [2021-05-06 12:02:53,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 144 states, 144 states have (on average 1.5902777777777777) internal successors, (229), 143 states have internal predecessors, (229), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:53,379 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 242 transitions. [2021-05-06 12:02:53,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-05-06 12:02:53,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:53,379 INFO L523 BasicCegarLoop]: trace histogram [84, 83, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:53,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2021-05-06 12:02:53,379 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:53,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:53,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1145076103, now seen corresponding path program 65 times [2021-05-06 12:02:53,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:53,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281774886] [2021-05-06 12:02:53,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:53,385 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:53,386 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:53,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:53,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:53,397 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:53,417 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:53,431 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:53,433 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:53,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:53,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:53,447 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:53,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:53,455 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:53,456 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:53,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:53,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:53,470 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:53,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:53,480 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:53,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:53,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:53,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:53,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:53,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:53,542 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:53,542 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:53,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:55,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:55,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:55,215 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 12:02:55,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:55,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:59,154 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:59,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281774886] [2021-05-06 12:02:59,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1281774886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:59,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:59,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [147] imperfect sequences [] total 147 [2021-05-06 12:02:59,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566621414] [2021-05-06 12:02:59,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 147 states [2021-05-06 12:02:59,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:59,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-05-06 12:02:59,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7101, Invalid=14361, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 12:02:59,157 INFO L87 Difference]: Start difference. First operand 239 states and 242 transitions. Second operand has 147 states, 147 states have (on average 1.5918367346938775) internal successors, (234), 146 states have internal predecessors, (234), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:16,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:16,196 INFO L93 Difference]: Finished difference Result 475 states and 486 transitions. [2021-05-06 12:03:16,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2021-05-06 12:03:16,197 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.5918367346938775) internal successors, (234), 146 states have internal predecessors, (234), 2 states have call successors, (3), 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 238 [2021-05-06 12:03:16,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:16,198 INFO L225 Difference]: With dead ends: 475 [2021-05-06 12:03:16,198 INFO L226 Difference]: Without dead ends: 244 [2021-05-06 12:03:16,200 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 289 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25228 ImplicationChecksByTransitivity, 16623.2ms TimeCoverageRelationStatistics Valid=21297, Invalid=63093, Unknown=0, NotChecked=0, Total=84390 [2021-05-06 12:03:16,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-05-06 12:03:16,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2021-05-06 12:03:16,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 239 states have (on average 1.0167364016736402) internal successors, (243), 239 states have internal predecessors, (243), 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 12:03:16,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 247 transitions. [2021-05-06 12:03:16,224 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 247 transitions. Word has length 238 [2021-05-06 12:03:16,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:16,225 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 247 transitions. [2021-05-06 12:03:16,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 147 states, 147 states have (on average 1.5918367346938775) internal successors, (234), 146 states have internal predecessors, (234), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:16,225 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 247 transitions. [2021-05-06 12:03:16,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-05-06 12:03:16,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:16,226 INFO L523 BasicCegarLoop]: trace histogram [86, 85, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:16,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable197 [2021-05-06 12:03:16,226 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:16,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:16,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1584430848, now seen corresponding path program 66 times [2021-05-06 12:03:16,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:16,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022246383] [2021-05-06 12:03:16,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:16,234 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:16,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:16,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:16,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:16,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:16,272 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:16,288 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:16,291 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:16,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:16,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:16,307 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:16,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:16,316 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:16,318 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:16,319 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:16,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:16,333 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:16,340 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:16,343 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:16,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:16,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:16,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:16,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:16,374 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:16,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:16,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:16,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:18,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:18,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:18,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:18,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:22,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:22,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022246383] [2021-05-06 12:03:22,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2022246383] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:22,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:22,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [150] imperfect sequences [] total 150 [2021-05-06 12:03:22,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255605334] [2021-05-06 12:03:22,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 150 states [2021-05-06 12:03:22,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:22,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-05-06 12:03:22,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7504, Invalid=15752, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 12:03:22,533 INFO L87 Difference]: Start difference. First operand 244 states and 247 transitions. Second operand has 150 states, 150 states have (on average 1.5933333333333333) internal successors, (239), 149 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:40,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:40,323 INFO L93 Difference]: Finished difference Result 653 states and 664 transitions. [2021-05-06 12:03:40,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2021-05-06 12:03:40,323 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 150 states have (on average 1.5933333333333333) internal successors, (239), 149 states have internal predecessors, (239), 2 states have call successors, (3), 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 243 [2021-05-06 12:03:40,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:40,324 INFO L225 Difference]: With dead ends: 653 [2021-05-06 12:03:40,325 INFO L226 Difference]: Without dead ends: 417 [2021-05-06 12:03:40,327 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 298 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27263 ImplicationChecksByTransitivity, 17564.6ms TimeCoverageRelationStatistics Valid=22160, Invalid=67540, Unknown=0, NotChecked=0, Total=89700 [2021-05-06 12:03:40,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-05-06 12:03:40,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 417. [2021-05-06 12:03:40,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 412 states have (on average 1.0121359223300972) internal successors, (417), 412 states have internal predecessors, (417), 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 12:03:40,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 421 transitions. [2021-05-06 12:03:40,369 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 421 transitions. Word has length 243 [2021-05-06 12:03:40,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:40,370 INFO L480 AbstractCegarLoop]: Abstraction has 417 states and 421 transitions. [2021-05-06 12:03:40,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 150 states, 150 states have (on average 1.5933333333333333) internal successors, (239), 149 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:40,370 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 421 transitions. [2021-05-06 12:03:40,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-05-06 12:03:40,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:40,371 INFO L523 BasicCegarLoop]: trace histogram [87, 86, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:40,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable200 [2021-05-06 12:03:40,371 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:40,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:40,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1012618088, now seen corresponding path program 67 times [2021-05-06 12:03:40,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:40,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582875948] [2021-05-06 12:03:40,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:40,377 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:40,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:40,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:40,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:40,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:40,408 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:40,422 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:40,425 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:40,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:40,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:40,438 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:40,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:40,446 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:40,448 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:40,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:40,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:40,461 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:40,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:40,472 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:40,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:40,486 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:40,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:40,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:40,504 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:40,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:40,519 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:40,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:42,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:42,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:42,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:42,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:48,938 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:48,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582875948] [2021-05-06 12:03:48,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [582875948] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:48,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:48,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [152] imperfect sequences [] total 152 [2021-05-06 12:03:48,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200291586] [2021-05-06 12:03:48,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 152 states [2021-05-06 12:03:48,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:48,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-05-06 12:03:48,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=21638, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 12:03:48,940 INFO L87 Difference]: Start difference. First operand 417 states and 421 transitions. Second operand has 152 states, 152 states have (on average 1.5921052631578947) internal successors, (242), 151 states have internal predecessors, (242), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:05,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:05,958 INFO L93 Difference]: Finished difference Result 656 states and 665 transitions. [2021-05-06 12:04:05,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 12:04:05,959 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.5921052631578947) internal successors, (242), 151 states have internal predecessors, (242), 2 states have call successors, (3), 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 246 [2021-05-06 12:04:05,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:05,960 INFO L225 Difference]: With dead ends: 656 [2021-05-06 12:04:05,960 INFO L226 Difference]: Without dead ends: 419 [2021-05-06 12:04:05,962 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9961 ImplicationChecksByTransitivity, 16964.9ms TimeCoverageRelationStatistics Valid=2676, Invalid=56130, Unknown=0, NotChecked=0, Total=58806 [2021-05-06 12:04:05,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-05-06 12:04:06,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 419. [2021-05-06 12:04:06,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 414 states have (on average 1.0120772946859904) internal successors, (419), 414 states have internal predecessors, (419), 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 12:04:06,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 423 transitions. [2021-05-06 12:04:06,018 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 423 transitions. Word has length 246 [2021-05-06 12:04:06,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:06,019 INFO L480 AbstractCegarLoop]: Abstraction has 419 states and 423 transitions. [2021-05-06 12:04:06,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 152 states, 152 states have (on average 1.5921052631578947) internal successors, (242), 151 states have internal predecessors, (242), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:06,019 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 423 transitions. [2021-05-06 12:04:06,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-05-06 12:04:06,020 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:06,020 INFO L523 BasicCegarLoop]: trace histogram [88, 87, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:06,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203 [2021-05-06 12:04:06,020 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:06,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:06,021 INFO L82 PathProgramCache]: Analyzing trace with hash -522217683, now seen corresponding path program 68 times [2021-05-06 12:04:06,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:06,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [945230448] [2021-05-06 12:04:06,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:06,029 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:06,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,068 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:06,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,087 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:06,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:06,103 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:06,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,112 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,114 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:06,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:06,131 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:06,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,143 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:06,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,180 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:06,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,197 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:08,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:08,194 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:08,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:12,489 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:12,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [945230448] [2021-05-06 12:04:12,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [945230448] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:12,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:12,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [153] imperfect sequences [] total 153 [2021-05-06 12:04:12,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375150643] [2021-05-06 12:04:12,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 153 states [2021-05-06 12:04:12,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:12,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2021-05-06 12:04:12,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7874, Invalid=16306, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 12:04:12,492 INFO L87 Difference]: Start difference. First operand 419 states and 423 transitions. Second operand has 153 states, 153 states have (on average 1.5947712418300655) internal successors, (244), 152 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:31,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:31,105 INFO L93 Difference]: Finished difference Result 659 states and 669 transitions. [2021-05-06 12:04:31,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-05-06 12:04:31,106 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.5947712418300655) internal successors, (244), 152 states have internal predecessors, (244), 2 states have call successors, (3), 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 248 [2021-05-06 12:04:31,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:31,107 INFO L225 Difference]: With dead ends: 659 [2021-05-06 12:04:31,107 INFO L226 Difference]: Without dead ends: 422 [2021-05-06 12:04:31,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 304 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28358 ImplicationChecksByTransitivity, 18178.6ms TimeCoverageRelationStatistics Valid=23173, Invalid=70157, Unknown=0, NotChecked=0, Total=93330 [2021-05-06 12:04:31,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2021-05-06 12:04:31,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 422. [2021-05-06 12:04:31,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 417 states have (on average 1.0119904076738608) internal successors, (422), 417 states have internal predecessors, (422), 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 12:04:31,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 426 transitions. [2021-05-06 12:04:31,167 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 426 transitions. Word has length 248 [2021-05-06 12:04:31,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:31,167 INFO L480 AbstractCegarLoop]: Abstraction has 422 states and 426 transitions. [2021-05-06 12:04:31,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 153 states, 153 states have (on average 1.5947712418300655) internal successors, (244), 152 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:31,168 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 426 transitions. [2021-05-06 12:04:31,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2021-05-06 12:04:31,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:31,169 INFO L523 BasicCegarLoop]: trace histogram [89, 88, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:31,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable206 [2021-05-06 12:04:31,169 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:31,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:31,169 INFO L82 PathProgramCache]: Analyzing trace with hash 956038129, now seen corresponding path program 69 times [2021-05-06 12:04:31,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:31,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465665503] [2021-05-06 12:04:31,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:31,177 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:31,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:31,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:31,210 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:31,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,227 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:31,234 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:31,242 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:31,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,264 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:31,266 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:31,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:31,279 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:31,287 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,290 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:31,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:31,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:31,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:31,334 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:31,354 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:31,355 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:31,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:33,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:33,357 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 12:04:33,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:40,202 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:40,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465665503] [2021-05-06 12:04:40,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [465665503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:40,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:40,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [155] imperfect sequences [] total 155 [2021-05-06 12:04:40,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477318210] [2021-05-06 12:04:40,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 155 states [2021-05-06 12:04:40,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:40,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2021-05-06 12:04:40,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2301, Invalid=22505, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 12:04:40,204 INFO L87 Difference]: Start difference. First operand 422 states and 426 transitions. Second operand has 155 states, 155 states have (on average 1.5935483870967742) internal successors, (247), 154 states have internal predecessors, (247), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:57,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:57,892 INFO L93 Difference]: Finished difference Result 662 states and 671 transitions. [2021-05-06 12:04:57,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 12:04:57,892 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 1.5935483870967742) internal successors, (247), 154 states have internal predecessors, (247), 2 states have call successors, (3), 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 251 [2021-05-06 12:04:57,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:57,893 INFO L225 Difference]: With dead ends: 662 [2021-05-06 12:04:57,894 INFO L226 Difference]: Without dead ends: 424 [2021-05-06 12:04:57,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10366 ImplicationChecksByTransitivity, 17747.2ms TimeCoverageRelationStatistics Valid=2755, Invalid=58501, Unknown=0, NotChecked=0, Total=61256 [2021-05-06 12:04:57,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-05-06 12:04:57,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 424. [2021-05-06 12:04:57,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 419 states have (on average 1.0119331742243436) internal successors, (424), 419 states have internal predecessors, (424), 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 12:04:57,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 428 transitions. [2021-05-06 12:04:57,942 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 428 transitions. Word has length 251 [2021-05-06 12:04:57,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:57,942 INFO L480 AbstractCegarLoop]: Abstraction has 424 states and 428 transitions. [2021-05-06 12:04:57,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 155 states, 155 states have (on average 1.5935483870967742) internal successors, (247), 154 states have internal predecessors, (247), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:57,942 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 428 transitions. [2021-05-06 12:04:57,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-05-06 12:04:57,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:57,943 INFO L523 BasicCegarLoop]: trace histogram [90, 89, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:57,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209 [2021-05-06 12:04:57,943 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:57,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:57,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1809075020, now seen corresponding path program 70 times [2021-05-06 12:04:57,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:57,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224847420] [2021-05-06 12:04:57,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:57,950 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:57,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:57,973 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:57,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:57,984 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:57,998 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,001 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:58,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:58,014 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:58,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,023 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,024 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:58,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:58,037 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:58,045 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,048 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:58,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:58,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,081 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:58,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,097 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:00,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:00,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:00,078 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:00,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:04,566 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:04,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224847420] [2021-05-06 12:05:04,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [224847420] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:04,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:04,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [156] imperfect sequences [] total 156 [2021-05-06 12:05:04,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314118862] [2021-05-06 12:05:04,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 156 states [2021-05-06 12:05:04,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:04,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2021-05-06 12:05:04,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8160, Invalid=16962, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 12:05:04,568 INFO L87 Difference]: Start difference. First operand 424 states and 428 transitions. Second operand has 156 states, 156 states have (on average 1.5961538461538463) internal successors, (249), 155 states have internal predecessors, (249), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:24,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:24,029 INFO L93 Difference]: Finished difference Result 665 states and 675 transitions. [2021-05-06 12:05:24,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2021-05-06 12:05:24,030 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 1.5961538461538463) internal successors, (249), 155 states have internal predecessors, (249), 2 states have call successors, (3), 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 253 [2021-05-06 12:05:24,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:24,031 INFO L225 Difference]: With dead ends: 665 [2021-05-06 12:05:24,031 INFO L226 Difference]: Without dead ends: 427 [2021-05-06 12:05:24,034 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 310 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29468 ImplicationChecksByTransitivity, 18824.4ms TimeCoverageRelationStatistics Valid=24023, Invalid=73009, Unknown=0, NotChecked=0, Total=97032 [2021-05-06 12:05:24,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2021-05-06 12:05:24,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 427. [2021-05-06 12:05:24,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 422 states have (on average 1.0118483412322274) internal successors, (427), 422 states have internal predecessors, (427), 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 12:05:24,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 431 transitions. [2021-05-06 12:05:24,091 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 431 transitions. Word has length 253 [2021-05-06 12:05:24,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:24,091 INFO L480 AbstractCegarLoop]: Abstraction has 427 states and 431 transitions. [2021-05-06 12:05:24,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 156 states, 156 states have (on average 1.5961538461538463) internal successors, (249), 155 states have internal predecessors, (249), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:24,091 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 431 transitions. [2021-05-06 12:05:24,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-05-06 12:05:24,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:24,092 INFO L523 BasicCegarLoop]: trace histogram [91, 90, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:24,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable212 [2021-05-06 12:05:24,092 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:24,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:24,092 INFO L82 PathProgramCache]: Analyzing trace with hash -217182116, now seen corresponding path program 71 times [2021-05-06 12:05:24,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:24,093 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108734480] [2021-05-06 12:05:24,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:24,099 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:24,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,114 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:24,124 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:24,132 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:24,147 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,149 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:24,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:24,163 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:24,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,171 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:24,172 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:24,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:24,185 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:24,193 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,196 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:24,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,210 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:24,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:24,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:24,228 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:24,243 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:24,243 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:24,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:26,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:26,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:33,364 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:33,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108734480] [2021-05-06 12:05:33,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2108734480] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:33,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:33,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [158] imperfect sequences [] total 158 [2021-05-06 12:05:33,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937131236] [2021-05-06 12:05:33,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 158 states [2021-05-06 12:05:33,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:33,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-05-06 12:05:33,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2371, Invalid=23389, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 12:05:33,366 INFO L87 Difference]: Start difference. First operand 427 states and 431 transitions. Second operand has 158 states, 158 states have (on average 1.5949367088607596) internal successors, (252), 157 states have internal predecessors, (252), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)