/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/theatreSquare.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:27:55,077 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:27:55,079 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:27:55,114 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:27:55,124 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:27:55,125 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:27:55,125 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:27:55,126 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:27:55,127 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:27:55,128 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:27:55,130 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:27:55,131 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:27:55,132 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:27:55,133 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:27:55,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:27:55,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:27:55,138 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:27:55,145 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:27:55,146 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:27:55,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:27:55,147 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:27:55,168 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:27:55,168 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:27:55,169 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:27:55,169 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:27:55,170 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:27:55,170 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:27:55,170 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:27:55,170 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:27:55,170 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:27:55,170 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:27:55,171 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:27:55,171 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:27:55,171 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:27:55,171 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:27:55,171 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:27:55,171 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:27:55,172 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:27:55,172 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:27:55,172 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:27:55,172 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:27:55,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:27:55,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:27:55,173 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:27:55,464 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:27:55,496 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:27:55,499 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:27:55,499 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:27:55,500 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:27:55,501 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/theatreSquare.c [2021-05-02 13:27:55,561 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dc5447e4/3d63f69a9ece46fa97daf322e79fc66d/FLAG6136da9b5 [2021-05-02 13:27:55,962 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:27:55,963 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/theatreSquare.c [2021-05-02 13:27:55,974 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dc5447e4/3d63f69a9ece46fa97daf322e79fc66d/FLAG6136da9b5 [2021-05-02 13:27:55,990 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9dc5447e4/3d63f69a9ece46fa97daf322e79fc66d [2021-05-02 13:27:55,993 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:27:55,995 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:27:55,998 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:27:55,999 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:27:56,002 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:27:56,003 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:27:55" (1/1) ... [2021-05-02 13:27:56,004 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55d59aa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56, skipping insertion in model container [2021-05-02 13:27:56,004 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:27:55" (1/1) ... [2021-05-02 13:27:56,010 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:27:56,034 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:27:56,134 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/theatreSquare.c[370,383] [2021-05-02 13:27:56,152 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:27:56,171 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:27:56,181 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/theatreSquare.c[370,383] [2021-05-02 13:27:56,204 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:27:56,217 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:27:56,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56 WrapperNode [2021-05-02 13:27:56,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:27:56,219 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:27:56,224 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:27:56,225 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:27:56,236 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,278 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,278 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,284 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,319 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,321 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (1/1) ... [2021-05-02 13:27:56,323 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:27:56,324 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:27:56,324 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:27:56,324 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:27:56,324 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (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 [2021-05-02 13:27:56,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:27:56,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:27:56,398 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:27:56,399 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:27:56,399 INFO L138 BoogieDeclarations]: Found implementation of procedure correct_version [2021-05-02 13:27:56,399 INFO L138 BoogieDeclarations]: Found implementation of procedure student_version [2021-05-02 13:27:56,399 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:27:56,399 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:27:56,400 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:27:56,400 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:27:56,400 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:27:56,400 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 13:27:56,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:27:56,401 INFO L130 BoogieDeclarations]: Found specification of procedure correct_version [2021-05-02 13:27:56,401 INFO L130 BoogieDeclarations]: Found specification of procedure student_version [2021-05-02 13:27:56,402 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:27:56,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:27:56,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:27:56,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:27:56,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:27:56,403 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:27:56,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:27:56,734 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:27:56,734 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-05-02 13:27:56,735 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:27:56 BoogieIcfgContainer [2021-05-02 13:27:56,735 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:27:56,737 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:27:56,737 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:27:56,739 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:27:56,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:27:55" (1/3) ... [2021-05-02 13:27:56,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@712bac05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:27:56, skipping insertion in model container [2021-05-02 13:27:56,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:27:56" (2/3) ... [2021-05-02 13:27:56,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@712bac05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:27:56, skipping insertion in model container [2021-05-02 13:27:56,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:27:56" (3/3) ... [2021-05-02 13:27:56,747 INFO L111 eAbstractionObserver]: Analyzing ICFG theatreSquare.c [2021-05-02 13:27:56,752 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:27:56,755 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:27:56,770 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:27:56,805 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:27:56,805 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:27:56,805 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:27:56,805 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:27:56,805 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:27:56,806 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:27:56,806 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:27:56,806 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:27:56,827 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:27:56,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:27:56,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:56,832 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:56,832 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:56,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:56,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1554304209, now seen corresponding path program 1 times [2021-05-02 13:27:56,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:56,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849856028] [2021-05-02 13:27:56,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:56,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:57,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:57,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:57,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:57,076 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:57,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849856028] [2021-05-02 13:27:57,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849856028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:57,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:57,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:27:57,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205161212] [2021-05-02 13:27:57,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:27:57,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:57,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:27:57,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:27:57,094 INFO L87 Difference]: Start difference. First operand has 39 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:27:57,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:57,509 INFO L93 Difference]: Finished difference Result 76 states and 103 transitions. [2021-05-02 13:27:57,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:27:57,510 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:27:57,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:57,515 INFO L225 Difference]: With dead ends: 76 [2021-05-02 13:27:57,516 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:27:57,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 226.8ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:27:57,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:27:57,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:27:57,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:27:57,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-05-02 13:27:57,549 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 11 [2021-05-02 13:27:57,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:57,549 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-05-02 13:27:57,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:27:57,550 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-05-02 13:27:57,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:27:57,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:57,551 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:57,551 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:27:57,551 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:57,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:57,552 INFO L82 PathProgramCache]: Analyzing trace with hash 362112746, now seen corresponding path program 1 times [2021-05-02 13:27:57,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:57,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861343818] [2021-05-02 13:27:57,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:57,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:57,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:57,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:57,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:57,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:57,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 13:27:57,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:57,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:57,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:57,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861343818] [2021-05-02 13:27:57,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861343818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:57,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:57,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-02 13:27:57,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096623231] [2021-05-02 13:27:57,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:27:57,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:57,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:27:57,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:27:57,817 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:27:58,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:58,379 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2021-05-02 13:27:58,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:27:58,379 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2021-05-02 13:27:58,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:58,384 INFO L225 Difference]: With dead ends: 50 [2021-05-02 13:27:58,385 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 13:27:58,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 442.3ms TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:27:58,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 13:27:58,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-05-02 13:27:58,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 32 states have internal predecessors, (38), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:27:58,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 13:27:58,407 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 31 [2021-05-02 13:27:58,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:58,408 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 13:27:58,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:27:58,408 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 13:27:58,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:27:58,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:58,411 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:58,414 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:27:58,414 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:58,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:58,416 INFO L82 PathProgramCache]: Analyzing trace with hash -310269904, now seen corresponding path program 1 times [2021-05-02 13:27:58,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:58,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185527240] [2021-05-02 13:27:58,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:58,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:58,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:58,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 13:27:58,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:58,567 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:58,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185527240] [2021-05-02 13:27:58,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185527240] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:58,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:58,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:27:58,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761453983] [2021-05-02 13:27:58,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:27:58,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:58,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:27:58,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:27:58,570 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:27:58,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:58,735 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2021-05-02 13:27:58,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:27:58,736 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2021-05-02 13:27:58,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:58,738 INFO L225 Difference]: With dead ends: 59 [2021-05-02 13:27:58,738 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 13:27:58,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 95.2ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:27:58,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 13:27:58,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 13:27:58,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 34 states have (on average 1.2941176470588236) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:27:58,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2021-05-02 13:27:58,759 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 32 [2021-05-02 13:27:58,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:58,759 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2021-05-02 13:27:58,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:27:58,760 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2021-05-02 13:27:58,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:27:58,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:58,761 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:58,761 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:27:58,761 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:58,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:58,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1053423629, now seen corresponding path program 1 times [2021-05-02 13:27:58,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:58,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435248611] [2021-05-02 13:27:58,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:58,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:58,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 13:27:58,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:58,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:27:58,856 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:58,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435248611] [2021-05-02 13:27:58,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435248611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:58,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:58,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:27:58,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125786976] [2021-05-02 13:27:58,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:27:58,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:58,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:27:58,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:27:58,859 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:27:59,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:59,014 INFO L93 Difference]: Finished difference Result 81 states and 100 transitions. [2021-05-02 13:27:59,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:27:59,014 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-05-02 13:27:59,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:59,015 INFO L225 Difference]: With dead ends: 81 [2021-05-02 13:27:59,015 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:27:59,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 86.5ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:27:59,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:27:59,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-05-02 13:27:59,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 40 states have internal predecessors, (50), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:27:59,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2021-05-02 13:27:59,024 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 32 [2021-05-02 13:27:59,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:59,024 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2021-05-02 13:27:59,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:27:59,024 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2021-05-02 13:27:59,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:27:59,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:59,025 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:59,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:27:59,025 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:59,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:59,026 INFO L82 PathProgramCache]: Analyzing trace with hash 755216986, now seen corresponding path program 1 times [2021-05-02 13:27:59,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:59,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458002969] [2021-05-02 13:27:59,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:59,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:59,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:59,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 13:27:59,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:27:59,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:59,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458002969] [2021-05-02 13:27:59,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458002969] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:59,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:59,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:27:59,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964580799] [2021-05-02 13:27:59,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:27:59,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:59,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:27:59,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:27:59,110 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:27:59,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:59,296 INFO L93 Difference]: Finished difference Result 89 states and 111 transitions. [2021-05-02 13:27:59,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:27:59,296 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 33 [2021-05-02 13:27:59,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:59,297 INFO L225 Difference]: With dead ends: 89 [2021-05-02 13:27:59,297 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:27:59,298 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 111.0ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:27:59,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:27:59,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 13:27:59,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 40 states have (on average 1.3) internal successors, (52), 42 states have internal predecessors, (52), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:27:59,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2021-05-02 13:27:59,306 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 33 [2021-05-02 13:27:59,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:59,306 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2021-05-02 13:27:59,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:27:59,306 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2021-05-02 13:27:59,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:27:59,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:59,307 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:59,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 13:27:59,308 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:59,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:59,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1535016286, now seen corresponding path program 1 times [2021-05-02 13:27:59,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:59,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144187391] [2021-05-02 13:27:59,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:59,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:59,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:59,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 13:27:59,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,401 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:27:59,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:59,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144187391] [2021-05-02 13:27:59,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144187391] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:59,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:59,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:27:59,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139600608] [2021-05-02 13:27:59,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:27:59,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:59,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:27:59,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:27:59,404 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:27:59,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:59,561 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2021-05-02 13:27:59,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:27:59,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 34 [2021-05-02 13:27:59,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:59,562 INFO L225 Difference]: With dead ends: 79 [2021-05-02 13:27:59,562 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 13:27:59,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 94.4ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:27:59,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 13:27:59,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 13:27:59,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 38 states have internal predecessors, (46), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:27:59,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2021-05-02 13:27:59,570 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 34 [2021-05-02 13:27:59,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:59,570 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2021-05-02 13:27:59,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:27:59,570 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2021-05-02 13:27:59,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:27:59,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:59,571 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:59,571 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 13:27:59,571 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:59,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:59,572 INFO L82 PathProgramCache]: Analyzing trace with hash -1563500484, now seen corresponding path program 1 times [2021-05-02 13:27:59,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:59,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860376127] [2021-05-02 13:27:59,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:59,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:59,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:59,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:27:59,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,648 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:27:59,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:59,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860376127] [2021-05-02 13:27:59,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860376127] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:59,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:59,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:27:59,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845601683] [2021-05-02 13:27:59,649 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:27:59,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:59,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:27:59,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:27:59,650 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:27:59,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:27:59,819 INFO L93 Difference]: Finished difference Result 57 states and 66 transitions. [2021-05-02 13:27:59,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:27:59,819 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-05-02 13:27:59,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:27:59,820 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:27:59,820 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 13:27:59,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 102.1ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:27:59,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 13:27:59,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 13:27:59,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 35 states have internal predecessors, (41), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:27:59,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2021-05-02 13:27:59,828 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 34 [2021-05-02 13:27:59,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:27:59,829 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2021-05-02 13:27:59,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:27:59,829 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2021-05-02 13:27:59,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:27:59,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:27:59,840 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:27:59,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 13:27:59,841 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:27:59,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:27:59,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1234948107, now seen corresponding path program 1 times [2021-05-02 13:27:59,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:27:59,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538507880] [2021-05-02 13:27:59,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:27:59,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:27:59,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:27:59,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-02 13:27:59,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:27:59,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:27:59,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:27:59,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538507880] [2021-05-02 13:27:59,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538507880] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:27:59,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:27:59,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:27:59,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55216008] [2021-05-02 13:27:59,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:27:59,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:27:59,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:27:59,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:27:59,920 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:00,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:00,062 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2021-05-02 13:28:00,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:28:00,062 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-05-02 13:28:00,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:00,063 INFO L225 Difference]: With dead ends: 64 [2021-05-02 13:28:00,063 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 13:28:00,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 96.5ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:28:00,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 13:28:00,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2021-05-02 13:28:00,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:00,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-05-02 13:28:00,089 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 35 [2021-05-02 13:28:00,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:00,089 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-05-02 13:28:00,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:00,090 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-05-02 13:28:00,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:28:00,090 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:00,090 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:00,090 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 13:28:00,090 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:00,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:00,091 INFO L82 PathProgramCache]: Analyzing trace with hash 2078941294, now seen corresponding path program 1 times [2021-05-02 13:28:00,091 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:00,091 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308959364] [2021-05-02 13:28:00,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:00,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:00,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:00,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:28:00,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,180 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:28:00,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:00,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308959364] [2021-05-02 13:28:00,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308959364] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:28:00,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:28:00,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 13:28:00,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583417402] [2021-05-02 13:28:00,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:28:00,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:00,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:28:00,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:28:00,182 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:00,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:00,386 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-02 13:28:00,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:28:00,387 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-05-02 13:28:00,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:00,387 INFO L225 Difference]: With dead ends: 46 [2021-05-02 13:28:00,387 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 13:28:00,388 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 131.9ms TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:28:00,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 13:28:00,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 13:28:00,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 28 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:00,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2021-05-02 13:28:00,393 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 35 [2021-05-02 13:28:00,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:00,393 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2021-05-02 13:28:00,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:00,393 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2021-05-02 13:28:00,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:28:00,394 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:00,394 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:00,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 13:28:00,394 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:00,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:00,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1371807532, now seen corresponding path program 1 times [2021-05-02 13:28:00,395 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:00,395 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441431808] [2021-05-02 13:28:00,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:00,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:00,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:00,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:28:00,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,466 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:28:00,466 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:00,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441431808] [2021-05-02 13:28:00,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441431808] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:28:00,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:28:00,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:28:00,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759904341] [2021-05-02 13:28:00,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:28:00,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:00,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:28:00,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:28:00,467 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:00,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:00,624 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2021-05-02 13:28:00,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:28:00,625 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2021-05-02 13:28:00,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:00,626 INFO L225 Difference]: With dead ends: 50 [2021-05-02 13:28:00,626 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 13:28:00,626 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 100.6ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:28:00,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 13:28:00,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 13:28:00,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:28:00,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-05-02 13:28:00,631 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 36 [2021-05-02 13:28:00,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:00,631 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-05-02 13:28:00,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:00,631 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-05-02 13:28:00,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:28:00,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:00,632 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:00,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 13:28:00,632 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:00,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:00,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1443111891, now seen corresponding path program 1 times [2021-05-02 13:28:00,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:00,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965293065] [2021-05-02 13:28:00,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:00,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:00,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:00,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:28:00,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:00,926 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:00,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:00,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965293065] [2021-05-02 13:28:00,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965293065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:00,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45127302] [2021-05-02 13:28:00,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:01,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:01,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:28:01,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:01,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:01,475 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:01,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45127302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:01,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:01,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 25 [2021-05-02 13:28:01,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646452245] [2021-05-02 13:28:01,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:28:01,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:01,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:28:01,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=543, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:28:01,478 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 25 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:02,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:02,475 INFO L93 Difference]: Finished difference Result 70 states and 83 transitions. [2021-05-02 13:28:02,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:28:02,476 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 37 [2021-05-02 13:28:02,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:02,477 INFO L225 Difference]: With dead ends: 70 [2021-05-02 13:28:02,477 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 13:28:02,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 953.0ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:28:02,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 13:28:02,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 54. [2021-05-02 13:28:02,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 44 states have internal predecessors, (52), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:28:02,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 13:28:02,486 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 37 [2021-05-02 13:28:02,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:02,486 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 13:28:02,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:02,486 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 13:28:02,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:28:02,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:02,487 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:02,711 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 13:28:02,712 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:02,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:02,712 INFO L82 PathProgramCache]: Analyzing trace with hash -437658803, now seen corresponding path program 2 times [2021-05-02 13:28:02,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:02,712 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67115393] [2021-05-02 13:28:02,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:02,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:02,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:02,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:02,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:02,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:02,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:28:02,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:02,782 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:02,783 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:02,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67115393] [2021-05-02 13:28:02,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67115393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:02,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819105351] [2021-05-02 13:28:02,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:02,847 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:02,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:02,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:28:02,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:02,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:02,957 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:02,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819105351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:02,957 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:02,957 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-05-02 13:28:02,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992960996] [2021-05-02 13:28:02,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:28:02,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:02,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:28:02,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:28:02,959 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:03,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:03,166 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2021-05-02 13:28:03,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:28:03,167 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 38 [2021-05-02 13:28:03,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:03,168 INFO L225 Difference]: With dead ends: 80 [2021-05-02 13:28:03,168 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 13:28:03,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 152.4ms TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:28:03,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 13:28:03,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-05-02 13:28:03,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 52 states have (on average 1.25) internal successors, (65), 54 states have internal predecessors, (65), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 13:28:03,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2021-05-02 13:28:03,178 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 38 [2021-05-02 13:28:03,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:03,178 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2021-05-02 13:28:03,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:03,178 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2021-05-02 13:28:03,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:28:03,179 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:03,179 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:03,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:28:03,405 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:03,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:03,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1488699212, now seen corresponding path program 3 times [2021-05-02 13:28:03,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:03,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279960063] [2021-05-02 13:28:03,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:03,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:03,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:03,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:03,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:03,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:03,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:28:03,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:03,551 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:03,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:03,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279960063] [2021-05-02 13:28:03,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279960063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:03,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242501748] [2021-05-02 13:28:03,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:03,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:28:03,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:03,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:28:03,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:03,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:03,780 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:03,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242501748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:03,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:03,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-05-02 13:28:03,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665153377] [2021-05-02 13:28:03,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:28:03,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:03,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:28:03,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:28:03,782 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:04,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:04,356 INFO L93 Difference]: Finished difference Result 82 states and 100 transitions. [2021-05-02 13:28:04,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:28:04,357 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 38 [2021-05-02 13:28:04,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:04,357 INFO L225 Difference]: With dead ends: 82 [2021-05-02 13:28:04,358 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:28:04,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 425.8ms TimeCoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:28:04,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:28:04,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2021-05-02 13:28:04,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 63 states have internal predecessors, (74), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 13:28:04,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 91 transitions. [2021-05-02 13:28:04,367 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 91 transitions. Word has length 38 [2021-05-02 13:28:04,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:04,367 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 91 transitions. [2021-05-02 13:28:04,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:04,367 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 91 transitions. [2021-05-02 13:28:04,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:28:04,368 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:04,368 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:04,591 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:28:04,591 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:04,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:04,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1229776654, now seen corresponding path program 4 times [2021-05-02 13:28:04,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:04,592 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021852380] [2021-05-02 13:28:04,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:04,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:04,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:04,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:04,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:04,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:04,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 13:28:04,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:04,671 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:04,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:04,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021852380] [2021-05-02 13:28:04,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021852380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:04,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660080528] [2021-05-02 13:28:04,672 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:04,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:04,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:04,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:28:04,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:04,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:04,821 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:04,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660080528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:04,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:04,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-05-02 13:28:04,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85606165] [2021-05-02 13:28:04,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:28:04,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:04,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:28:04,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:28:04,822 INFO L87 Difference]: Start difference. First operand 74 states and 91 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:05,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:05,025 INFO L93 Difference]: Finished difference Result 140 states and 174 transitions. [2021-05-02 13:28:05,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:28:05,025 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 38 [2021-05-02 13:28:05,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:05,026 INFO L225 Difference]: With dead ends: 140 [2021-05-02 13:28:05,026 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 13:28:05,027 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 152.2ms TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:28:05,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 13:28:05,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2021-05-02 13:28:05,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 69 states have (on average 1.2608695652173914) internal successors, (87), 73 states have internal predecessors, (87), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 13:28:05,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 104 transitions. [2021-05-02 13:28:05,036 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 104 transitions. Word has length 38 [2021-05-02 13:28:05,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:05,036 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 104 transitions. [2021-05-02 13:28:05,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:05,037 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 104 transitions. [2021-05-02 13:28:05,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:28:05,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:05,037 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:05,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:05,260 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:05,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:05,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1473231215, now seen corresponding path program 5 times [2021-05-02 13:28:05,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:05,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730058370] [2021-05-02 13:28:05,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:05,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:05,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:05,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:05,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:05,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:05,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 13:28:05,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:05,407 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:05,408 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:05,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730058370] [2021-05-02 13:28:05,408 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730058370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:05,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457223392] [2021-05-02 13:28:05,408 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:05,473 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:05,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:05,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:28:05,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:05,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:05,659 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:05,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457223392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:05,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:05,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-05-02 13:28:05,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014693] [2021-05-02 13:28:05,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:28:05,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:05,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:28:05,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:28:05,661 INFO L87 Difference]: Start difference. First operand 84 states and 104 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:06,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:06,202 INFO L93 Difference]: Finished difference Result 92 states and 111 transitions. [2021-05-02 13:28:06,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:28:06,203 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 38 [2021-05-02 13:28:06,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:06,204 INFO L225 Difference]: With dead ends: 92 [2021-05-02 13:28:06,204 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 13:28:06,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 421.9ms TimeCoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:28:06,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 13:28:06,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2021-05-02 13:28:06,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 69 states have (on average 1.2608695652173914) internal successors, (87), 73 states have internal predecessors, (87), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-05-02 13:28:06,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2021-05-02 13:28:06,212 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 38 [2021-05-02 13:28:06,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:06,212 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2021-05-02 13:28:06,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:06,213 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2021-05-02 13:28:06,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:28:06,213 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:06,213 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:06,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:28:06,437 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:06,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:06,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1109766783, now seen corresponding path program 6 times [2021-05-02 13:28:06,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:06,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993662748] [2021-05-02 13:28:06,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:06,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:06,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:06,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:06,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:06,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:06,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:28:06,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:06,613 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:06,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:06,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993662748] [2021-05-02 13:28:06,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993662748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:06,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126027256] [2021-05-02 13:28:06,613 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:06,681 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-02 13:28:06,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:06,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:28:06,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:06,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:06,894 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:06,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126027256] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:06,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:06,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2021-05-02 13:28:06,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277478097] [2021-05-02 13:28:06,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:28:06,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:06,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:28:06,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:28:06,898 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:07,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:07,480 INFO L93 Difference]: Finished difference Result 108 states and 128 transitions. [2021-05-02 13:28:07,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:28:07,480 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-02 13:28:07,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:07,481 INFO L225 Difference]: With dead ends: 108 [2021-05-02 13:28:07,481 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 13:28:07,482 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 442.9ms TimeCoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:28:07,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 13:28:07,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 89. [2021-05-02 13:28:07,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 71 states have (on average 1.2394366197183098) internal successors, (88), 77 states have internal predecessors, (88), 8 states have call successors, (8), 5 states have call predecessors, (8), 9 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) [2021-05-02 13:28:07,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 107 transitions. [2021-05-02 13:28:07,491 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 107 transitions. Word has length 39 [2021-05-02 13:28:07,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:07,491 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 107 transitions. [2021-05-02 13:28:07,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:07,491 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 107 transitions. [2021-05-02 13:28:07,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:28:07,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:07,492 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:07,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:28:07,716 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:07,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:07,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1701022282, now seen corresponding path program 7 times [2021-05-02 13:28:07,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:07,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157403148] [2021-05-02 13:28:07,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:07,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:07,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:07,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:07,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:07,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:07,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 13:28:07,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:08,021 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:08,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:08,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157403148] [2021-05-02 13:28:08,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157403148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:08,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955714428] [2021-05-02 13:28:08,022 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:08,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:08,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:28:08,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:08,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:08,346 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:08,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955714428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:08,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:08,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 27 [2021-05-02 13:28:08,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788872927] [2021-05-02 13:28:08,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:28:08,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:08,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:28:08,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=641, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:28:08,349 INFO L87 Difference]: Start difference. First operand 89 states and 107 transitions. Second operand has 27 states, 24 states have (on average 1.625) internal successors, (39), 21 states have internal predecessors, (39), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:09,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:09,456 INFO L93 Difference]: Finished difference Result 137 states and 170 transitions. [2021-05-02 13:28:09,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:28:09,456 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 1.625) internal successors, (39), 21 states have internal predecessors, (39), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 39 [2021-05-02 13:28:09,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:09,457 INFO L225 Difference]: With dead ends: 137 [2021-05-02 13:28:09,457 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 13:28:09,458 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 981.9ms TimeCoverageRelationStatistics Valid=169, Invalid=1901, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:28:09,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 13:28:09,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 121. [2021-05-02 13:28:09,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 97 states have (on average 1.2371134020618557) internal successors, (120), 107 states have internal predecessors, (120), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (19), 8 states have call predecessors, (19), 8 states have call successors, (19) [2021-05-02 13:28:09,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 149 transitions. [2021-05-02 13:28:09,470 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 149 transitions. Word has length 39 [2021-05-02 13:28:09,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:09,470 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 149 transitions. [2021-05-02 13:28:09,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 24 states have (on average 1.625) internal successors, (39), 21 states have internal predecessors, (39), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:09,470 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 149 transitions. [2021-05-02 13:28:09,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:28:09,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:09,471 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:09,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:09,677 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:09,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:09,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1844910907, now seen corresponding path program 8 times [2021-05-02 13:28:09,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:09,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110078155] [2021-05-02 13:28:09,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:09,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:09,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:09,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:09,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:09,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:09,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:09,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:09,880 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:09,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:09,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110078155] [2021-05-02 13:28:09,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110078155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:09,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632754420] [2021-05-02 13:28:09,880 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:09,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:09,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:09,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:28:09,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:09,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:09,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:10,113 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:10,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632754420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:10,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:10,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2021-05-02 13:28:10,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232601532] [2021-05-02 13:28:10,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:28:10,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:10,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:28:10,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:28:10,116 INFO L87 Difference]: Start difference. First operand 121 states and 149 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:10,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:10,629 INFO L93 Difference]: Finished difference Result 132 states and 159 transitions. [2021-05-02 13:28:10,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:28:10,631 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-02 13:28:10,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:10,632 INFO L225 Difference]: With dead ends: 132 [2021-05-02 13:28:10,632 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 13:28:10,633 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 404.0ms TimeCoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:28:10,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 13:28:10,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-05-02 13:28:10,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 94 states have (on average 1.2340425531914894) internal successors, (116), 104 states have internal predecessors, (116), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-05-02 13:28:10,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 142 transitions. [2021-05-02 13:28:10,644 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 142 transitions. Word has length 39 [2021-05-02 13:28:10,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:10,644 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 142 transitions. [2021-05-02 13:28:10,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:10,645 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 142 transitions. [2021-05-02 13:28:10,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:28:10,645 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:10,645 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:10,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:28:10,867 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:10,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:10,868 INFO L82 PathProgramCache]: Analyzing trace with hash 172610767, now seen corresponding path program 9 times [2021-05-02 13:28:10,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:10,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138633893] [2021-05-02 13:28:10,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:10,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:10,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:10,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:10,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:10,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:10,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 13:28:10,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:11,088 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:11,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:11,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138633893] [2021-05-02 13:28:11,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138633893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:11,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762260018] [2021-05-02 13:28:11,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:11,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:28:11,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:11,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:28:11,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:11,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:11,371 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:11,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762260018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:11,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:11,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 19 [2021-05-02 13:28:11,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276599442] [2021-05-02 13:28:11,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:28:11,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:11,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:28:11,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=300, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:28:11,373 INFO L87 Difference]: Start difference. First operand 118 states and 142 transitions. Second operand has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:12,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:12,045 INFO L93 Difference]: Finished difference Result 136 states and 165 transitions. [2021-05-02 13:28:12,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:28:12,046 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 40 [2021-05-02 13:28:12,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:12,046 INFO L225 Difference]: With dead ends: 136 [2021-05-02 13:28:12,047 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 13:28:12,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 554.3ms TimeCoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:28:12,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 13:28:12,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 113. [2021-05-02 13:28:12,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 89 states have (on average 1.247191011235955) internal successors, (111), 99 states have internal predecessors, (111), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (17), 8 states have call predecessors, (17), 8 states have call successors, (17) [2021-05-02 13:28:12,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 138 transitions. [2021-05-02 13:28:12,058 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 138 transitions. Word has length 40 [2021-05-02 13:28:12,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:12,058 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 138 transitions. [2021-05-02 13:28:12,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:12,058 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 138 transitions. [2021-05-02 13:28:12,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:28:12,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:12,059 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:12,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:12,269 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:12,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:12,269 INFO L82 PathProgramCache]: Analyzing trace with hash -306897140, now seen corresponding path program 10 times [2021-05-02 13:28:12,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:12,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522108207] [2021-05-02 13:28:12,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:12,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:12,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:12,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:12,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:12,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:12,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:12,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:12,436 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:12,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:12,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522108207] [2021-05-02 13:28:12,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522108207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:12,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729500985] [2021-05-02 13:28:12,437 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:12,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:12,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:12,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:28:12,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:12,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:12,726 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:12,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729500985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:12,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:12,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 19 [2021-05-02 13:28:12,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801581944] [2021-05-02 13:28:12,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:28:12,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:12,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:28:12,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=300, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:28:12,728 INFO L87 Difference]: Start difference. First operand 113 states and 138 transitions. Second operand has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:13,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:13,450 INFO L93 Difference]: Finished difference Result 128 states and 153 transitions. [2021-05-02 13:28:13,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:28:13,450 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 40 [2021-05-02 13:28:13,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:13,451 INFO L225 Difference]: With dead ends: 128 [2021-05-02 13:28:13,451 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 13:28:13,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 500.1ms TimeCoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:28:13,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 13:28:13,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 114. [2021-05-02 13:28:13,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 90 states have (on average 1.2444444444444445) internal successors, (112), 100 states have internal predecessors, (112), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-05-02 13:28:13,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 137 transitions. [2021-05-02 13:28:13,464 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 137 transitions. Word has length 40 [2021-05-02 13:28:13,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:13,465 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 137 transitions. [2021-05-02 13:28:13,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:13,465 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 137 transitions. [2021-05-02 13:28:13,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:28:13,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:13,466 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:13,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:13,677 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:13,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:13,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1295907854, now seen corresponding path program 11 times [2021-05-02 13:28:13,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:13,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590105735] [2021-05-02 13:28:13,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:13,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:13,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:13,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:13,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:13,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:13,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 13:28:13,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:13,747 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:13,747 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:13,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590105735] [2021-05-02 13:28:13,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590105735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:13,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087495164] [2021-05-02 13:28:13,747 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:13,818 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:13,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:13,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:28:13,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:13,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:13,909 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:13,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087495164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:13,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:13,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 13:28:13,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098924219] [2021-05-02 13:28:13,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:28:13,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:13,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:28:13,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:28:13,910 INFO L87 Difference]: Start difference. First operand 114 states and 137 transitions. Second operand has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:14,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:14,163 INFO L93 Difference]: Finished difference Result 170 states and 199 transitions. [2021-05-02 13:28:14,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:28:14,163 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 40 [2021-05-02 13:28:14,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:14,164 INFO L225 Difference]: With dead ends: 170 [2021-05-02 13:28:14,164 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 13:28:14,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 187.5ms TimeCoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:28:14,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 13:28:14,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 97. [2021-05-02 13:28:14,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 85 states have internal predecessors, (97), 8 states have call successors, (8), 5 states have call predecessors, (8), 9 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-05-02 13:28:14,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 114 transitions. [2021-05-02 13:28:14,176 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 114 transitions. Word has length 40 [2021-05-02 13:28:14,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:14,176 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 114 transitions. [2021-05-02 13:28:14,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:14,176 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 114 transitions. [2021-05-02 13:28:14,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:28:14,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:14,177 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:14,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:28:14,397 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:14,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:14,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1335621997, now seen corresponding path program 12 times [2021-05-02 13:28:14,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:14,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264491360] [2021-05-02 13:28:14,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:14,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:14,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:14,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:14,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:14,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:14,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:14,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:14,470 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:14,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:14,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264491360] [2021-05-02 13:28:14,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264491360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:14,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471104234] [2021-05-02 13:28:14,470 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:14,522 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-02 13:28:14,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:14,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:28:14,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:14,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:14,623 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:14,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471104234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:14,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:14,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 13:28:14,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696850158] [2021-05-02 13:28:14,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:28:14,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:14,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:28:14,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:28:14,625 INFO L87 Difference]: Start difference. First operand 97 states and 114 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:14,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:14,889 INFO L93 Difference]: Finished difference Result 115 states and 134 transitions. [2021-05-02 13:28:14,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:28:14,891 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 40 [2021-05-02 13:28:14,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:14,891 INFO L225 Difference]: With dead ends: 115 [2021-05-02 13:28:14,892 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 13:28:14,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 201.3ms TimeCoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:28:14,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 13:28:14,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-02 13:28:14,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 82 states have (on average 1.2195121951219512) internal successors, (100), 88 states have internal predecessors, (100), 8 states have call successors, (8), 5 states have call predecessors, (8), 9 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-05-02 13:28:14,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 117 transitions. [2021-05-02 13:28:14,902 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 117 transitions. Word has length 40 [2021-05-02 13:28:14,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:14,902 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 117 transitions. [2021-05-02 13:28:14,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:14,902 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 117 transitions. [2021-05-02 13:28:14,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:28:14,909 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:14,909 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:15,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 13:28:15,125 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:15,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:15,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1943349171, now seen corresponding path program 13 times [2021-05-02 13:28:15,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:15,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230434269] [2021-05-02 13:28:15,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:15,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:15,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:15,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:15,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,498 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:15,498 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:15,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230434269] [2021-05-02 13:28:15,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230434269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:15,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883738706] [2021-05-02 13:28:15,499 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:15,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:15,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:28:15,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:15,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:15,846 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:15,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883738706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:15,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:15,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 29 [2021-05-02 13:28:15,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725583711] [2021-05-02 13:28:15,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:28:15,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:15,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:28:15,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=747, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:28:15,848 INFO L87 Difference]: Start difference. First operand 100 states and 117 transitions. Second operand has 29 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 23 states have internal predecessors, (41), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:17,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:17,134 INFO L93 Difference]: Finished difference Result 140 states and 164 transitions. [2021-05-02 13:28:17,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:28:17,135 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 23 states have internal predecessors, (41), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 41 [2021-05-02 13:28:17,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:17,136 INFO L225 Difference]: With dead ends: 140 [2021-05-02 13:28:17,136 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 13:28:17,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1103.7ms TimeCoverageRelationStatistics Valid=181, Invalid=2269, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:28:17,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 13:28:17,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 116. [2021-05-02 13:28:17,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 95 states have (on average 1.2105263157894737) internal successors, (115), 103 states have internal predecessors, (115), 9 states have call successors, (9), 5 states have call predecessors, (9), 11 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2021-05-02 13:28:17,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 136 transitions. [2021-05-02 13:28:17,148 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 136 transitions. Word has length 41 [2021-05-02 13:28:17,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:17,148 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 136 transitions. [2021-05-02 13:28:17,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 23 states have internal predecessors, (41), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:17,148 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 136 transitions. [2021-05-02 13:28:17,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:28:17,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:17,149 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:17,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:28:17,353 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:17,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:17,353 INFO L82 PathProgramCache]: Analyzing trace with hash -196254195, now seen corresponding path program 14 times [2021-05-02 13:28:17,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:17,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600246531] [2021-05-02 13:28:17,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:17,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:17,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:17,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:17,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:17,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:17,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:17,649 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:17,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600246531] [2021-05-02 13:28:17,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600246531] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067621041] [2021-05-02 13:28:17,649 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:17,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:17,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:17,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:28:17,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:17,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:17,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:18,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:18,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:18,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:18,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:18,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:18,071 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:18,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067621041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:18,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:18,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 29 [2021-05-02 13:28:18,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163873521] [2021-05-02 13:28:18,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:28:18,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:18,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:28:18,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=743, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:28:18,073 INFO L87 Difference]: Start difference. First operand 116 states and 136 transitions. Second operand has 29 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 23 states have internal predecessors, (41), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:19,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:19,012 INFO L93 Difference]: Finished difference Result 134 states and 157 transitions. [2021-05-02 13:28:19,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:28:19,013 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 23 states have internal predecessors, (41), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 41 [2021-05-02 13:28:19,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:19,013 INFO L225 Difference]: With dead ends: 134 [2021-05-02 13:28:19,013 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 13:28:19,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 1027.9ms TimeCoverageRelationStatistics Valid=183, Invalid=2073, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:28:19,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 13:28:19,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2021-05-02 13:28:19,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 112 states have internal predecessors, (124), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-05-02 13:28:19,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 149 transitions. [2021-05-02 13:28:19,027 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 149 transitions. Word has length 41 [2021-05-02 13:28:19,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:19,027 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 149 transitions. [2021-05-02 13:28:19,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 23 states have internal predecessors, (41), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:19,027 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 149 transitions. [2021-05-02 13:28:19,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:28:19,028 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:19,028 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:19,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:19,241 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:19,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:19,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1133754580, now seen corresponding path program 15 times [2021-05-02 13:28:19,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:19,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30394031] [2021-05-02 13:28:19,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:19,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:19,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:19,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:19,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:19,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:19,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:19,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:19,444 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:19,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:19,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30394031] [2021-05-02 13:28:19,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30394031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:19,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900249681] [2021-05-02 13:28:19,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:19,511 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:28:19,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:19,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:28:19,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:19,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:19,813 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:19,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900249681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:19,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:19,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 23 [2021-05-02 13:28:19,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153629791] [2021-05-02 13:28:19,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:28:19,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:19,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:28:19,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=454, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:28:19,815 INFO L87 Difference]: Start difference. First operand 126 states and 149 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:20,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:20,805 INFO L93 Difference]: Finished difference Result 152 states and 180 transitions. [2021-05-02 13:28:20,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:28:20,815 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2021-05-02 13:28:20,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:20,815 INFO L225 Difference]: With dead ends: 152 [2021-05-02 13:28:20,815 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 13:28:20,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 722.4ms TimeCoverageRelationStatistics Valid=115, Invalid=1075, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:28:20,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 13:28:20,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 129. [2021-05-02 13:28:20,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 105 states have (on average 1.2285714285714286) internal successors, (129), 115 states have internal predecessors, (129), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-05-02 13:28:20,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 154 transitions. [2021-05-02 13:28:20,829 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 154 transitions. Word has length 42 [2021-05-02 13:28:20,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:20,829 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 154 transitions. [2021-05-02 13:28:20,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:20,829 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 154 transitions. [2021-05-02 13:28:20,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:28:20,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:20,830 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:21,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 13:28:21,053 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:21,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:21,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1181369487, now seen corresponding path program 16 times [2021-05-02 13:28:21,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:21,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686565517] [2021-05-02 13:28:21,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:21,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:21,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:21,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:21,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:21,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:21,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:28:21,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:21,245 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:21,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:21,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686565517] [2021-05-02 13:28:21,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686565517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:21,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346408207] [2021-05-02 13:28:21,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:21,307 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:21,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:21,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:28:21,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:21,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:21,592 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:21,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346408207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:21,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:21,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 23 [2021-05-02 13:28:21,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518031579] [2021-05-02 13:28:21,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:28:21,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:21,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:28:21,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=454, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:28:21,595 INFO L87 Difference]: Start difference. First operand 129 states and 154 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:22,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:22,591 INFO L93 Difference]: Finished difference Result 144 states and 169 transitions. [2021-05-02 13:28:22,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:28:22,592 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2021-05-02 13:28:22,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:22,592 INFO L225 Difference]: With dead ends: 144 [2021-05-02 13:28:22,593 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 13:28:22,593 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 707.9ms TimeCoverageRelationStatistics Valid=115, Invalid=1075, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:28:22,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 13:28:22,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2021-05-02 13:28:22,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 106 states have (on average 1.2264150943396226) internal successors, (130), 116 states have internal predecessors, (130), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) [2021-05-02 13:28:22,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 154 transitions. [2021-05-02 13:28:22,606 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 154 transitions. Word has length 42 [2021-05-02 13:28:22,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:22,607 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 154 transitions. [2021-05-02 13:28:22,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:22,607 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 154 transitions. [2021-05-02 13:28:22,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:28:22,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:22,608 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:22,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:22,825 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:22,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:22,826 INFO L82 PathProgramCache]: Analyzing trace with hash -439775891, now seen corresponding path program 17 times [2021-05-02 13:28:22,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:22,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657238961] [2021-05-02 13:28:22,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:22,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:22,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:22,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:22,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:22,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:22,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:22,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:22,913 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:22,913 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:22,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657238961] [2021-05-02 13:28:22,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657238961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:22,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648342942] [2021-05-02 13:28:22,914 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:22,980 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:28:22,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:22,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:28:22,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:23,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,101 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:23,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648342942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:23,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:23,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-05-02 13:28:23,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828853043] [2021-05-02 13:28:23,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:28:23,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:23,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:28:23,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:28:23,104 INFO L87 Difference]: Start difference. First operand 130 states and 154 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:23,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:23,509 INFO L93 Difference]: Finished difference Result 186 states and 223 transitions. [2021-05-02 13:28:23,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:28:23,510 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 42 [2021-05-02 13:28:23,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:23,511 INFO L225 Difference]: With dead ends: 186 [2021-05-02 13:28:23,511 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 13:28:23,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 304.4ms TimeCoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:28:23,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 13:28:23,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 152. [2021-05-02 13:28:23,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 128 states have (on average 1.2265625) internal successors, (157), 138 states have internal predecessors, (157), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) [2021-05-02 13:28:23,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 181 transitions. [2021-05-02 13:28:23,532 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 181 transitions. Word has length 42 [2021-05-02 13:28:23,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:23,532 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 181 transitions. [2021-05-02 13:28:23,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:23,532 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 181 transitions. [2021-05-02 13:28:23,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:28:23,533 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:23,533 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:23,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 13:28:23,756 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:23,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:23,757 INFO L82 PathProgramCache]: Analyzing trace with hash -466729134, now seen corresponding path program 18 times [2021-05-02 13:28:23,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:23,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080952104] [2021-05-02 13:28:23,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:23,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:23,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:23,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:23,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:23,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:23,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:28:23,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:23,842 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:23,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:23,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080952104] [2021-05-02 13:28:23,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080952104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:23,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92354214] [2021-05-02 13:28:23,843 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:23,909 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 13:28:23,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:23,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:28:23,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:23,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:23,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:24,010 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 13:28:24,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92354214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:24,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:24,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-05-02 13:28:24,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145449662] [2021-05-02 13:28:24,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:28:24,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:24,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:28:24,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:28:24,011 INFO L87 Difference]: Start difference. First operand 152 states and 181 transitions. Second operand has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 11 states have internal predecessors, (47), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:24,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:24,363 INFO L93 Difference]: Finished difference Result 290 states and 347 transitions. [2021-05-02 13:28:24,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:28:24,363 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 11 states have internal predecessors, (47), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 42 [2021-05-02 13:28:24,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:24,365 INFO L225 Difference]: With dead ends: 290 [2021-05-02 13:28:24,365 INFO L226 Difference]: Without dead ends: 186 [2021-05-02 13:28:24,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 284.1ms TimeCoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:28:24,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-02 13:28:24,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 174. [2021-05-02 13:28:24,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 150 states have (on average 1.2266666666666666) internal successors, (184), 160 states have internal predecessors, (184), 10 states have call successors, (10), 5 states have call predecessors, (10), 13 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) [2021-05-02 13:28:24,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 208 transitions. [2021-05-02 13:28:24,385 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 208 transitions. Word has length 42 [2021-05-02 13:28:24,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:24,385 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 208 transitions. [2021-05-02 13:28:24,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 11 states have internal predecessors, (47), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:24,385 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 208 transitions. [2021-05-02 13:28:24,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:28:24,386 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:24,387 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:24,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:28:24,601 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:24,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:24,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1243243306, now seen corresponding path program 19 times [2021-05-02 13:28:24,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:24,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816810059] [2021-05-02 13:28:24,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:24,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:24,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:24,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:24,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:24,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:24,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:28:24,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:25,023 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:25,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:25,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816810059] [2021-05-02 13:28:25,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816810059] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:25,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839529750] [2021-05-02 13:28:25,023 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:25,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:25,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:28:25,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:25,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:25,352 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:25,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839529750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:25,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:25,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 31 [2021-05-02 13:28:25,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151616801] [2021-05-02 13:28:25,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:28:25,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:25,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:28:25,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=861, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:28:25,354 INFO L87 Difference]: Start difference. First operand 174 states and 208 transitions. Second operand has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 25 states have internal predecessors, (43), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:27,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:27,077 INFO L93 Difference]: Finished difference Result 224 states and 267 transitions. [2021-05-02 13:28:27,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:28:27,078 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 25 states have internal predecessors, (43), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 43 [2021-05-02 13:28:27,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:27,079 INFO L225 Difference]: With dead ends: 224 [2021-05-02 13:28:27,079 INFO L226 Difference]: Without dead ends: 218 [2021-05-02 13:28:27,081 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1261.3ms TimeCoverageRelationStatistics Valid=193, Invalid=2669, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:28:27,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-02 13:28:27,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 190. [2021-05-02 13:28:27,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 163 states have (on average 1.2208588957055215) internal successors, (199), 175 states have internal predecessors, (199), 11 states have call successors, (11), 5 states have call predecessors, (11), 15 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17) [2021-05-02 13:28:27,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 227 transitions. [2021-05-02 13:28:27,102 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 227 transitions. Word has length 43 [2021-05-02 13:28:27,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:27,102 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 227 transitions. [2021-05-02 13:28:27,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 25 states have internal predecessors, (43), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:27,102 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 227 transitions. [2021-05-02 13:28:27,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:28:27,103 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:27,103 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:27,326 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:28:27,326 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:27,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:27,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1453763067, now seen corresponding path program 20 times [2021-05-02 13:28:27,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:27,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133613159] [2021-05-02 13:28:27,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:27,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:27,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:27,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:27,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:27,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:27,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:28:27,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:27,536 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:28:27,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:27,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133613159] [2021-05-02 13:28:27,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133613159] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:27,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602033199] [2021-05-02 13:28:27,537 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:27,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:27,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:27,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:28:27,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:27,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:27,829 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:28:27,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602033199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:27,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:27,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11] total 21 [2021-05-02 13:28:27,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992738040] [2021-05-02 13:28:27,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:28:27,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:27,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:28:27,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=371, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:28:27,831 INFO L87 Difference]: Start difference. First operand 190 states and 227 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:28,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:28,552 INFO L93 Difference]: Finished difference Result 230 states and 273 transitions. [2021-05-02 13:28:28,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:28:28,557 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-02 13:28:28,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:28,558 INFO L225 Difference]: With dead ends: 230 [2021-05-02 13:28:28,558 INFO L226 Difference]: Without dead ends: 215 [2021-05-02 13:28:28,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 580.1ms TimeCoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:28:28,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-02 13:28:28,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 210. [2021-05-02 13:28:28,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 174 states have (on average 1.2011494252873562) internal successors, (209), 192 states have internal predecessors, (209), 14 states have call successors, (14), 5 states have call predecessors, (14), 21 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2021-05-02 13:28:28,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 249 transitions. [2021-05-02 13:28:28,581 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 249 transitions. Word has length 43 [2021-05-02 13:28:28,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:28,581 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 249 transitions. [2021-05-02 13:28:28,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:28,581 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 249 transitions. [2021-05-02 13:28:28,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:28:28,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:28,583 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:28,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:28:28,803 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:28,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:28,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1804610186, now seen corresponding path program 21 times [2021-05-02 13:28:28,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:28,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947800795] [2021-05-02 13:28:28,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:28,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:28,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:28,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:28,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:28,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:29,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:28:29,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:29,177 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:29,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:29,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947800795] [2021-05-02 13:28:29,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947800795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:29,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819077462] [2021-05-02 13:28:29,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:29,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:28:29,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:29,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:28:29,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:29,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:29,610 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:29,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819077462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:29,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:29,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 31 [2021-05-02 13:28:29,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817367223] [2021-05-02 13:28:29,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:28:29,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:29,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:28:29,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=857, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:28:29,612 INFO L87 Difference]: Start difference. First operand 210 states and 249 transitions. Second operand has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 25 states have internal predecessors, (43), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:30,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:30,980 INFO L93 Difference]: Finished difference Result 228 states and 271 transitions. [2021-05-02 13:28:30,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:28:30,981 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 25 states have internal predecessors, (43), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 43 [2021-05-02 13:28:30,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:30,982 INFO L225 Difference]: With dead ends: 228 [2021-05-02 13:28:30,982 INFO L226 Difference]: Without dead ends: 213 [2021-05-02 13:28:30,984 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1281.4ms TimeCoverageRelationStatistics Valid=195, Invalid=2457, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:28:30,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-02 13:28:31,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 208. [2021-05-02 13:28:31,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 172 states have (on average 1.2093023255813953) internal successors, (208), 190 states have internal predecessors, (208), 14 states have call successors, (14), 5 states have call predecessors, (14), 21 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2021-05-02 13:28:31,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 248 transitions. [2021-05-02 13:28:31,008 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 248 transitions. Word has length 43 [2021-05-02 13:28:31,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:31,009 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 248 transitions. [2021-05-02 13:28:31,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 25 states have internal predecessors, (43), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:31,009 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 248 transitions. [2021-05-02 13:28:31,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:28:31,011 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:31,011 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:31,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:31,225 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:31,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:31,225 INFO L82 PathProgramCache]: Analyzing trace with hash -2095538945, now seen corresponding path program 22 times [2021-05-02 13:28:31,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:31,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406394406] [2021-05-02 13:28:31,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:31,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:31,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:31,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:31,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:31,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:31,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:31,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:31,426 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:28:31,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:31,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406394406] [2021-05-02 13:28:31,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406394406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:31,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958155554] [2021-05-02 13:28:31,426 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:31,480 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:31,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:31,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:28:31,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:31,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:31,698 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:28:31,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958155554] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:31,698 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:31,698 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11] total 21 [2021-05-02 13:28:31,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223202830] [2021-05-02 13:28:31,698 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:28:31,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:31,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:28:31,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=371, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:28:31,699 INFO L87 Difference]: Start difference. First operand 208 states and 248 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:32,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:32,431 INFO L93 Difference]: Finished difference Result 222 states and 261 transitions. [2021-05-02 13:28:32,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:28:32,431 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-02 13:28:32,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:32,432 INFO L225 Difference]: With dead ends: 222 [2021-05-02 13:28:32,432 INFO L226 Difference]: Without dead ends: 202 [2021-05-02 13:28:32,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 551.5ms TimeCoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:28:32,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-02 13:28:32,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2021-05-02 13:28:32,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 164 states have (on average 1.2073170731707317) internal successors, (198), 182 states have internal predecessors, (198), 14 states have call successors, (14), 5 states have call predecessors, (14), 21 states have return successors, (24), 12 states have call predecessors, (24), 12 states have call successors, (24) [2021-05-02 13:28:32,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 236 transitions. [2021-05-02 13:28:32,453 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 236 transitions. Word has length 43 [2021-05-02 13:28:32,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:32,453 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 236 transitions. [2021-05-02 13:28:32,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:32,454 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 236 transitions. [2021-05-02 13:28:32,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:28:32,455 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:32,455 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:32,678 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:32,678 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:32,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:32,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1133635601, now seen corresponding path program 23 times [2021-05-02 13:28:32,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:32,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718488633] [2021-05-02 13:28:32,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:32,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:32,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:32,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:32,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:32,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:32,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:28:32,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:32,928 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:32,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:32,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718488633] [2021-05-02 13:28:32,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718488633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:32,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508953237] [2021-05-02 13:28:32,929 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:32,991 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:28:32,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:32,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:28:32,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:33,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:33,409 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:33,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508953237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:33,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:33,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2021-05-02 13:28:33,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827932533] [2021-05-02 13:28:33,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:28:33,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:33,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:28:33,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=640, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:28:33,411 INFO L87 Difference]: Start difference. First operand 200 states and 236 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:34,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:34,497 INFO L93 Difference]: Finished difference Result 244 states and 289 transitions. [2021-05-02 13:28:34,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:28:34,497 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 44 [2021-05-02 13:28:34,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:34,498 INFO L225 Difference]: With dead ends: 244 [2021-05-02 13:28:34,499 INFO L226 Difference]: Without dead ends: 230 [2021-05-02 13:28:34,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 931.3ms TimeCoverageRelationStatistics Valid=135, Invalid=1505, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:28:34,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-02 13:28:34,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 221. [2021-05-02 13:28:34,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 182 states have (on average 1.2087912087912087) internal successors, (220), 202 states have internal predecessors, (220), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (27), 13 states have call predecessors, (27), 13 states have call successors, (27) [2021-05-02 13:28:34,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 262 transitions. [2021-05-02 13:28:34,523 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 262 transitions. Word has length 44 [2021-05-02 13:28:34,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:34,523 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 262 transitions. [2021-05-02 13:28:34,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:34,523 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 262 transitions. [2021-05-02 13:28:34,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:28:34,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:34,525 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:34,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 13:28:34,748 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:34,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:34,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1915733740, now seen corresponding path program 24 times [2021-05-02 13:28:34,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:34,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767030587] [2021-05-02 13:28:34,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:34,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:34,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:34,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:34,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:34,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:34,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:34,990 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:34,990 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:34,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767030587] [2021-05-02 13:28:34,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767030587] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:34,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997700961] [2021-05-02 13:28:34,990 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:35,058 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:28:35,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:35,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:28:35,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:35,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:35,456 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:35,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997700961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:35,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:35,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2021-05-02 13:28:35,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062267821] [2021-05-02 13:28:35,457 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:28:35,457 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:35,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:28:35,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=640, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:28:35,458 INFO L87 Difference]: Start difference. First operand 221 states and 262 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:36,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:36,894 INFO L93 Difference]: Finished difference Result 236 states and 277 transitions. [2021-05-02 13:28:36,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:28:36,895 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 44 [2021-05-02 13:28:36,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:36,896 INFO L225 Difference]: With dead ends: 236 [2021-05-02 13:28:36,896 INFO L226 Difference]: Without dead ends: 224 [2021-05-02 13:28:36,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 953.3ms TimeCoverageRelationStatistics Valid=135, Invalid=1505, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:28:36,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-02 13:28:36,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 222. [2021-05-02 13:28:36,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 183 states have (on average 1.2076502732240437) internal successors, (221), 203 states have internal predecessors, (221), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (25), 13 states have call predecessors, (25), 13 states have call successors, (25) [2021-05-02 13:28:36,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 261 transitions. [2021-05-02 13:28:36,922 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 261 transitions. Word has length 44 [2021-05-02 13:28:36,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:36,922 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 261 transitions. [2021-05-02 13:28:36,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:36,922 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 261 transitions. [2021-05-02 13:28:36,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:28:36,924 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:36,924 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:37,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:37,147 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:37,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:37,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1794700818, now seen corresponding path program 25 times [2021-05-02 13:28:37,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:37,148 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069449509] [2021-05-02 13:28:37,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:37,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:37,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:37,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:37,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:37,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:37,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:28:37,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:37,238 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:37,238 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:37,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069449509] [2021-05-02 13:28:37,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069449509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:37,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716689914] [2021-05-02 13:28:37,239 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:37,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:37,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:28:37,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:37,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:37,418 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:37,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716689914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:37,418 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:37,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 13 [2021-05-02 13:28:37,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267364936] [2021-05-02 13:28:37,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:28:37,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:37,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:28:37,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:28:37,420 INFO L87 Difference]: Start difference. First operand 222 states and 261 transitions. Second operand has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:37,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:37,814 INFO L93 Difference]: Finished difference Result 339 states and 391 transitions. [2021-05-02 13:28:37,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:28:37,814 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 44 [2021-05-02 13:28:37,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:37,815 INFO L225 Difference]: With dead ends: 339 [2021-05-02 13:28:37,815 INFO L226 Difference]: Without dead ends: 215 [2021-05-02 13:28:37,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 290.9ms TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:28:37,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-02 13:28:37,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 207. [2021-05-02 13:28:37,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 174 states have (on average 1.1954022988505748) internal successors, (208), 190 states have internal predecessors, (208), 13 states have call successors, (13), 5 states have call predecessors, (13), 19 states have return successors, (19), 11 states have call predecessors, (19), 11 states have call successors, (19) [2021-05-02 13:28:37,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 240 transitions. [2021-05-02 13:28:37,839 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 240 transitions. Word has length 44 [2021-05-02 13:28:37,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:37,839 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 240 transitions. [2021-05-02 13:28:37,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:37,839 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 240 transitions. [2021-05-02 13:28:37,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:28:37,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:37,841 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:38,062 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 13:28:38,063 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:38,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:38,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1255089933, now seen corresponding path program 26 times [2021-05-02 13:28:38,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:38,063 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442609614] [2021-05-02 13:28:38,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:38,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:38,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:38,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:38,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:38,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:38,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:38,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:38,146 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:38,147 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:38,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442609614] [2021-05-02 13:28:38,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442609614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:38,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909100274] [2021-05-02 13:28:38,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:38,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:38,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:38,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:28:38,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:38,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:38,310 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:38,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909100274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:38,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:38,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 13 [2021-05-02 13:28:38,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292183093] [2021-05-02 13:28:38,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:28:38,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:38,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:28:38,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:28:38,312 INFO L87 Difference]: Start difference. First operand 207 states and 240 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:38,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:38,754 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2021-05-02 13:28:38,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:28:38,754 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-05-02 13:28:38,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:38,755 INFO L225 Difference]: With dead ends: 233 [2021-05-02 13:28:38,755 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 13:28:38,756 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 337.2ms TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:28:38,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 13:28:38,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-05-02 13:28:38,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 179 states have (on average 1.1899441340782122) internal successors, (213), 195 states have internal predecessors, (213), 13 states have call successors, (13), 5 states have call predecessors, (13), 19 states have return successors, (19), 11 states have call predecessors, (19), 11 states have call successors, (19) [2021-05-02 13:28:38,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 245 transitions. [2021-05-02 13:28:38,779 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 245 transitions. Word has length 44 [2021-05-02 13:28:38,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:38,780 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 245 transitions. [2021-05-02 13:28:38,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:38,780 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 245 transitions. [2021-05-02 13:28:38,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:28:38,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:38,782 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:39,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 13:28:39,005 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:39,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:39,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1761268627, now seen corresponding path program 27 times [2021-05-02 13:28:39,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:39,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11334772] [2021-05-02 13:28:39,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:39,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:39,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:39,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:39,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:39,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:39,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:39,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:39,439 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:39,439 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:39,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11334772] [2021-05-02 13:28:39,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11334772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:39,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776416333] [2021-05-02 13:28:39,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:39,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:28:39,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:39,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:28:39,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:39,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:39,807 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:39,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776416333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:39,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:39,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 33 [2021-05-02 13:28:39,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835699137] [2021-05-02 13:28:39,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:28:39,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:39,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:28:39,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=983, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:28:39,809 INFO L87 Difference]: Start difference. First operand 212 states and 245 transitions. Second operand has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:41,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:41,848 INFO L93 Difference]: Finished difference Result 270 states and 312 transitions. [2021-05-02 13:28:41,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:28:41,848 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 45 [2021-05-02 13:28:41,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:41,849 INFO L225 Difference]: With dead ends: 270 [2021-05-02 13:28:41,849 INFO L226 Difference]: Without dead ends: 264 [2021-05-02 13:28:41,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 1371.9ms TimeCoverageRelationStatistics Valid=205, Invalid=3101, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:28:41,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-02 13:28:41,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 228. [2021-05-02 13:28:41,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 192 states have (on average 1.1875) internal successors, (228), 210 states have internal predecessors, (228), 14 states have call successors, (14), 5 states have call predecessors, (14), 21 states have return successors, (22), 12 states have call predecessors, (22), 12 states have call successors, (22) [2021-05-02 13:28:41,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 264 transitions. [2021-05-02 13:28:41,877 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 264 transitions. Word has length 45 [2021-05-02 13:28:41,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:41,877 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 264 transitions. [2021-05-02 13:28:41,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:41,877 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 264 transitions. [2021-05-02 13:28:41,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:28:41,879 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:41,879 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:42,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 13:28:42,097 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:42,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:42,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1247111507, now seen corresponding path program 28 times [2021-05-02 13:28:42,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:42,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443467623] [2021-05-02 13:28:42,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:42,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:42,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:42,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:42,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:42,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:42,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:42,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:42,493 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:42,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:42,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443467623] [2021-05-02 13:28:42,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443467623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:42,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501794745] [2021-05-02 13:28:42,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:42,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:42,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:42,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:28:42,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:42,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:42,933 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:42,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501794745] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:42,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:42,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 33 [2021-05-02 13:28:42,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216126988] [2021-05-02 13:28:42,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:28:42,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:42,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:28:42,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=979, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:28:42,936 INFO L87 Difference]: Start difference. First operand 228 states and 264 transitions. Second operand has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:44,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:44,498 INFO L93 Difference]: Finished difference Result 234 states and 269 transitions. [2021-05-02 13:28:44,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:28:44,498 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 45 [2021-05-02 13:28:44,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:44,499 INFO L225 Difference]: With dead ends: 234 [2021-05-02 13:28:44,500 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 13:28:44,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 1321.7ms TimeCoverageRelationStatistics Valid=207, Invalid=2873, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:28:44,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 13:28:44,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-05-02 13:28:44,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 179 states have (on average 1.1899441340782122) internal successors, (213), 195 states have internal predecessors, (213), 13 states have call successors, (13), 5 states have call predecessors, (13), 19 states have return successors, (20), 11 states have call predecessors, (20), 11 states have call successors, (20) [2021-05-02 13:28:44,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 246 transitions. [2021-05-02 13:28:44,525 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 246 transitions. Word has length 45 [2021-05-02 13:28:44,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:44,525 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 246 transitions. [2021-05-02 13:28:44,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:44,525 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 246 transitions. [2021-05-02 13:28:44,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:28:44,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:44,527 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:44,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:44,749 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:44,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:44,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1602219117, now seen corresponding path program 29 times [2021-05-02 13:28:44,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:44,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036233029] [2021-05-02 13:28:44,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:44,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:44,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:44,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:44,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:44,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:44,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:44,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:45,071 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:28:45,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:45,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036233029] [2021-05-02 13:28:45,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036233029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:45,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961453505] [2021-05-02 13:28:45,071 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:45,124 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:28:45,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:45,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:28:45,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:45,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:45,544 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:28:45,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961453505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:45,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:45,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 33 [2021-05-02 13:28:45,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217098716] [2021-05-02 13:28:45,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:28:45,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:45,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:28:45,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=975, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:28:45,545 INFO L87 Difference]: Start difference. First operand 212 states and 246 transitions. Second operand has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:46,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:46,777 INFO L93 Difference]: Finished difference Result 230 states and 267 transitions. [2021-05-02 13:28:46,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:28:46,778 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 45 [2021-05-02 13:28:46,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:46,779 INFO L225 Difference]: With dead ends: 230 [2021-05-02 13:28:46,779 INFO L226 Difference]: Without dead ends: 224 [2021-05-02 13:28:46,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 1228.5ms TimeCoverageRelationStatistics Valid=209, Invalid=2653, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:28:46,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-02 13:28:46,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 222. [2021-05-02 13:28:46,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 186 states have (on average 1.1935483870967742) internal successors, (222), 204 states have internal predecessors, (222), 14 states have call successors, (14), 5 states have call predecessors, (14), 21 states have return successors, (23), 12 states have call predecessors, (23), 12 states have call successors, (23) [2021-05-02 13:28:46,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 259 transitions. [2021-05-02 13:28:46,803 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 259 transitions. Word has length 45 [2021-05-02 13:28:46,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:46,804 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 259 transitions. [2021-05-02 13:28:46,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 30 states have (on average 1.5) internal successors, (45), 27 states have internal predecessors, (45), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:46,804 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 259 transitions. [2021-05-02 13:28:46,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:28:46,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:46,805 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:47,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 13:28:47,021 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:47,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:47,021 INFO L82 PathProgramCache]: Analyzing trace with hash 215774988, now seen corresponding path program 30 times [2021-05-02 13:28:47,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:47,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238272258] [2021-05-02 13:28:47,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:47,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:47,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:47,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:47,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:47,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:47,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:47,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:47,308 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:47,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:47,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238272258] [2021-05-02 13:28:47,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238272258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:47,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140681263] [2021-05-02 13:28:47,309 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:47,374 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:28:47,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:47,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:28:47,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:47,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:47,850 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:47,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140681263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:47,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:47,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 31 [2021-05-02 13:28:47,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396262331] [2021-05-02 13:28:47,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:28:47,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:47,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:28:47,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=858, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:28:47,851 INFO L87 Difference]: Start difference. First operand 222 states and 259 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:49,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:49,607 INFO L93 Difference]: Finished difference Result 268 states and 314 transitions. [2021-05-02 13:28:49,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:28:49,608 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-05-02 13:28:49,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:49,609 INFO L225 Difference]: With dead ends: 268 [2021-05-02 13:28:49,609 INFO L226 Difference]: Without dead ends: 254 [2021-05-02 13:28:49,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1132.9ms TimeCoverageRelationStatistics Valid=155, Invalid=2007, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:28:49,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-02 13:28:49,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 245. [2021-05-02 13:28:49,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 206 states have (on average 1.1941747572815533) internal successors, (246), 226 states have internal predecessors, (246), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (26), 13 states have call predecessors, (26), 13 states have call successors, (26) [2021-05-02 13:28:49,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 287 transitions. [2021-05-02 13:28:49,639 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 287 transitions. Word has length 46 [2021-05-02 13:28:49,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:49,639 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 287 transitions. [2021-05-02 13:28:49,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:49,639 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 287 transitions. [2021-05-02 13:28:49,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:28:49,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:49,641 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:49,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:49,863 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:49,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:49,864 INFO L82 PathProgramCache]: Analyzing trace with hash 256944047, now seen corresponding path program 31 times [2021-05-02 13:28:49,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:49,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541398699] [2021-05-02 13:28:49,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:49,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:49,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:49,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:49,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:49,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:49,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:28:50,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:50,148 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:50,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:50,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541398699] [2021-05-02 13:28:50,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541398699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:50,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340994312] [2021-05-02 13:28:50,148 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:50,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:50,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:28:50,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:50,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:50,680 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:28:50,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340994312] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:50,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:50,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 31 [2021-05-02 13:28:50,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732915346] [2021-05-02 13:28:50,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:28:50,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:50,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:28:50,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=858, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:28:50,681 INFO L87 Difference]: Start difference. First operand 245 states and 287 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:52,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:52,418 INFO L93 Difference]: Finished difference Result 260 states and 302 transitions. [2021-05-02 13:28:52,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:28:52,419 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-05-02 13:28:52,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:52,420 INFO L225 Difference]: With dead ends: 260 [2021-05-02 13:28:52,420 INFO L226 Difference]: Without dead ends: 248 [2021-05-02 13:28:52,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 1121.9ms TimeCoverageRelationStatistics Valid=155, Invalid=2007, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:28:52,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-02 13:28:52,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 246. [2021-05-02 13:28:52,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 207 states have (on average 1.1932367149758454) internal successors, (247), 227 states have internal predecessors, (247), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (24), 13 states have call predecessors, (24), 13 states have call successors, (24) [2021-05-02 13:28:52,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 286 transitions. [2021-05-02 13:28:52,450 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 286 transitions. Word has length 46 [2021-05-02 13:28:52,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:52,450 INFO L480 AbstractCegarLoop]: Abstraction has 246 states and 286 transitions. [2021-05-02 13:28:52,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:28:52,450 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 286 transitions. [2021-05-02 13:28:52,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:28:52,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:52,452 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:52,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 13:28:52,669 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:52,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:52,669 INFO L82 PathProgramCache]: Analyzing trace with hash -521678067, now seen corresponding path program 32 times [2021-05-02 13:28:52,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:52,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499316307] [2021-05-02 13:28:52,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:52,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:52,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:52,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:52,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:52,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:52,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:28:52,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:52,769 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:52,769 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:52,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499316307] [2021-05-02 13:28:52,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499316307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:52,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736628994] [2021-05-02 13:28:52,770 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:52,826 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:28:52,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:52,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:28:52,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:52,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:52,952 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:52,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736628994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:52,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:52,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2021-05-02 13:28:52,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561527650] [2021-05-02 13:28:52,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:28:52,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:52,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:28:52,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:28:52,954 INFO L87 Difference]: Start difference. First operand 246 states and 286 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:53,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:53,513 INFO L93 Difference]: Finished difference Result 332 states and 391 transitions. [2021-05-02 13:28:53,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:28:53,513 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 46 [2021-05-02 13:28:53,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:53,514 INFO L225 Difference]: With dead ends: 332 [2021-05-02 13:28:53,514 INFO L226 Difference]: Without dead ends: 302 [2021-05-02 13:28:53,515 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 467.7ms TimeCoverageRelationStatistics Valid=223, Invalid=589, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:28:53,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-02 13:28:53,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 284. [2021-05-02 13:28:53,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 245 states have (on average 1.1918367346938776) internal successors, (292), 265 states have internal predecessors, (292), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (24), 13 states have call predecessors, (24), 13 states have call successors, (24) [2021-05-02 13:28:53,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 331 transitions. [2021-05-02 13:28:53,552 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 331 transitions. Word has length 46 [2021-05-02 13:28:53,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:53,552 INFO L480 AbstractCegarLoop]: Abstraction has 284 states and 331 transitions. [2021-05-02 13:28:53,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:28:53,552 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 331 transitions. [2021-05-02 13:28:53,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:28:53,554 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:53,554 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:53,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 13:28:53,757 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:53,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:53,757 INFO L82 PathProgramCache]: Analyzing trace with hash -467445298, now seen corresponding path program 33 times [2021-05-02 13:28:53,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:53,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303758537] [2021-05-02 13:28:53,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:53,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:53,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:53,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:53,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:53,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:53,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:28:53,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:53,839 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:53,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:53,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303758537] [2021-05-02 13:28:53,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303758537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:53,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745397714] [2021-05-02 13:28:53,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:53,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:28:53,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:53,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:28:53,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:53,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:53,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:54,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:54,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:54,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:54,047 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 13:28:54,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745397714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:54,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:54,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2021-05-02 13:28:54,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785638500] [2021-05-02 13:28:54,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:28:54,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:54,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:28:54,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:28:54,048 INFO L87 Difference]: Start difference. First operand 284 states and 331 transitions. Second operand has 15 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 14 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:54,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:54,643 INFO L93 Difference]: Finished difference Result 525 states and 613 transitions. [2021-05-02 13:28:54,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:28:54,643 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 14 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 46 [2021-05-02 13:28:54,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:54,645 INFO L225 Difference]: With dead ends: 525 [2021-05-02 13:28:54,645 INFO L226 Difference]: Without dead ends: 340 [2021-05-02 13:28:54,647 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 510.8ms TimeCoverageRelationStatistics Valid=223, Invalid=589, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:28:54,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-05-02 13:28:54,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 322. [2021-05-02 13:28:54,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 283 states have (on average 1.1908127208480566) internal successors, (337), 303 states have internal predecessors, (337), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (24), 13 states have call predecessors, (24), 13 states have call successors, (24) [2021-05-02 13:28:54,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 376 transitions. [2021-05-02 13:28:54,691 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 376 transitions. Word has length 46 [2021-05-02 13:28:54,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:54,691 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 376 transitions. [2021-05-02 13:28:54,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 14 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:54,691 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 376 transitions. [2021-05-02 13:28:54,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:28:54,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:54,693 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:54,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:54,909 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:54,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:54,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1644141558, now seen corresponding path program 34 times [2021-05-02 13:28:54,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:54,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120359888] [2021-05-02 13:28:54,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:54,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:54,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:54,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:54,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:54,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:55,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:28:55,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:55,479 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:55,479 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:55,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120359888] [2021-05-02 13:28:55,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120359888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:55,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368404336] [2021-05-02 13:28:55,479 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:55,558 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:28:55,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:55,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 13:28:55,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:55,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:55,878 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:28:55,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368404336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:55,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:55,879 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 35 [2021-05-02 13:28:55,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360783786] [2021-05-02 13:28:55,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:28:55,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:55,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:28:55,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1113, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:28:55,880 INFO L87 Difference]: Start difference. First operand 322 states and 376 transitions. Second operand has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:58,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:28:58,172 INFO L93 Difference]: Finished difference Result 392 states and 457 transitions. [2021-05-02 13:28:58,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:28:58,173 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 47 [2021-05-02 13:28:58,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:28:58,175 INFO L225 Difference]: With dead ends: 392 [2021-05-02 13:28:58,175 INFO L226 Difference]: Without dead ends: 386 [2021-05-02 13:28:58,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 1598.1ms TimeCoverageRelationStatistics Valid=217, Invalid=3565, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:28:58,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-05-02 13:28:58,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 338. [2021-05-02 13:28:58,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 318 states have internal predecessors, (352), 16 states have call successors, (16), 5 states have call predecessors, (16), 25 states have return successors, (27), 14 states have call predecessors, (27), 14 states have call successors, (27) [2021-05-02 13:28:58,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 395 transitions. [2021-05-02 13:28:58,222 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 395 transitions. Word has length 47 [2021-05-02 13:28:58,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:28:58,222 INFO L480 AbstractCegarLoop]: Abstraction has 338 states and 395 transitions. [2021-05-02 13:28:58,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:28:58,222 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 395 transitions. [2021-05-02 13:28:58,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:28:58,224 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:28:58,224 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:28:58,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-05-02 13:28:58,447 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:28:58,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:28:58,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1497239530, now seen corresponding path program 35 times [2021-05-02 13:28:58,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:28:58,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578387075] [2021-05-02 13:28:58,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:28:58,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:58,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:28:58,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:58,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:28:58,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:58,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:28:58,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:28:58,893 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:58,893 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:28:58,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578387075] [2021-05-02 13:28:58,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578387075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:58,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331796388] [2021-05-02 13:28:58,893 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:28:58,945 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:28:58,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:28:58,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:28:58,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:28:59,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:28:59,359 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:28:59,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331796388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:28:59,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:28:59,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 35 [2021-05-02 13:28:59,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622690436] [2021-05-02 13:28:59,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:28:59,359 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:28:59,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:28:59,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1109, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:28:59,372 INFO L87 Difference]: Start difference. First operand 338 states and 395 transitions. Second operand has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:01,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:01,290 INFO L93 Difference]: Finished difference Result 344 states and 400 transitions. [2021-05-02 13:29:01,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:29:01,291 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 47 [2021-05-02 13:29:01,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:01,292 INFO L225 Difference]: With dead ends: 344 [2021-05-02 13:29:01,292 INFO L226 Difference]: Without dead ends: 322 [2021-05-02 13:29:01,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 1457.4ms TimeCoverageRelationStatistics Valid=219, Invalid=3321, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:29:01,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-05-02 13:29:01,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 322. [2021-05-02 13:29:01,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 283 states have (on average 1.1908127208480566) internal successors, (337), 303 states have internal predecessors, (337), 15 states have call successors, (15), 5 states have call predecessors, (15), 23 states have return successors, (25), 13 states have call predecessors, (25), 13 states have call successors, (25) [2021-05-02 13:29:01,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 377 transitions. [2021-05-02 13:29:01,328 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 377 transitions. Word has length 47 [2021-05-02 13:29:01,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:01,328 INFO L480 AbstractCegarLoop]: Abstraction has 322 states and 377 transitions. [2021-05-02 13:29:01,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:01,329 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 377 transitions. [2021-05-02 13:29:01,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:29:01,330 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:01,331 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:01,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:01,545 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:01,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:01,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1271699905, now seen corresponding path program 36 times [2021-05-02 13:29:01,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:01,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095215498] [2021-05-02 13:29:01,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:01,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:01,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:01,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:01,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:01,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:01,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:29:01,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:01,803 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:29:01,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:01,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095215498] [2021-05-02 13:29:01,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095215498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:01,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638663226] [2021-05-02 13:29:01,804 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:01,867 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 13:29:01,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:01,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:29:01,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:01,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:01,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:01,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:01,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:01,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:01,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:01,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:02,178 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:29:02,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638663226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:02,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:02,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 25 [2021-05-02 13:29:02,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64252103] [2021-05-02 13:29:02,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:29:02,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:02,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:29:02,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=541, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:29:02,179 INFO L87 Difference]: Start difference. First operand 322 states and 377 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:03,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:03,385 INFO L93 Difference]: Finished difference Result 378 states and 443 transitions. [2021-05-02 13:29:03,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:29:03,386 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2021-05-02 13:29:03,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:03,388 INFO L225 Difference]: With dead ends: 378 [2021-05-02 13:29:03,388 INFO L226 Difference]: Without dead ends: 362 [2021-05-02 13:29:03,390 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 819.1ms TimeCoverageRelationStatistics Valid=127, Invalid=1205, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:29:03,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-02 13:29:03,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 357. [2021-05-02 13:29:03,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 303 states have (on average 1.174917491749175) internal successors, (356), 333 states have internal predecessors, (356), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (40), 18 states have call predecessors, (40), 18 states have call successors, (40) [2021-05-02 13:29:03,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 416 transitions. [2021-05-02 13:29:03,435 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 416 transitions. Word has length 47 [2021-05-02 13:29:03,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:03,435 INFO L480 AbstractCegarLoop]: Abstraction has 357 states and 416 transitions. [2021-05-02 13:29:03,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:03,435 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 416 transitions. [2021-05-02 13:29:03,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:29:03,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:03,438 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:03,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-05-02 13:29:03,661 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:03,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:03,661 INFO L82 PathProgramCache]: Analyzing trace with hash 83484810, now seen corresponding path program 37 times [2021-05-02 13:29:03,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:03,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580493355] [2021-05-02 13:29:03,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:03,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:03,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:03,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:03,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:03,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:03,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:29:03,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:04,110 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:29:04,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:04,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580493355] [2021-05-02 13:29:04,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580493355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:04,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356227663] [2021-05-02 13:29:04,110 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:04,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:04,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:29:04,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:04,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:04,663 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:29:04,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356227663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:04,664 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:04,664 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 35 [2021-05-02 13:29:04,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727056035] [2021-05-02 13:29:04,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:29:04,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:04,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:29:04,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1105, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:29:04,665 INFO L87 Difference]: Start difference. First operand 357 states and 416 transitions. Second operand has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:06,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:06,255 INFO L93 Difference]: Finished difference Result 375 states and 438 transitions. [2021-05-02 13:29:06,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:29:06,255 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 47 [2021-05-02 13:29:06,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:06,257 INFO L225 Difference]: With dead ends: 375 [2021-05-02 13:29:06,258 INFO L226 Difference]: Without dead ends: 359 [2021-05-02 13:29:06,259 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 1513.2ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:29:06,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-05-02 13:29:06,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 354. [2021-05-02 13:29:06,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 300 states have (on average 1.18) internal successors, (354), 330 states have internal predecessors, (354), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (40), 18 states have call predecessors, (40), 18 states have call successors, (40) [2021-05-02 13:29:06,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 414 transitions. [2021-05-02 13:29:06,303 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 414 transitions. Word has length 47 [2021-05-02 13:29:06,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:06,303 INFO L480 AbstractCegarLoop]: Abstraction has 354 states and 414 transitions. [2021-05-02 13:29:06,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 32 states have (on average 1.46875) internal successors, (47), 29 states have internal predecessors, (47), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:06,303 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 414 transitions. [2021-05-02 13:29:06,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:29:06,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:06,306 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:06,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-02 13:29:06,529 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:06,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:06,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1251929861, now seen corresponding path program 38 times [2021-05-02 13:29:06,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:06,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455895613] [2021-05-02 13:29:06,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:06,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:06,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:06,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:06,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:06,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:06,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:06,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:06,766 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:29:06,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:06,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455895613] [2021-05-02 13:29:06,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455895613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:06,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097161380] [2021-05-02 13:29:06,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:06,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:06,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:06,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:29:06,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:06,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:06,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:07,139 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:29:07,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097161380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:07,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:07,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 25 [2021-05-02 13:29:07,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194843971] [2021-05-02 13:29:07,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:29:07,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:07,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:29:07,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=541, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:29:07,140 INFO L87 Difference]: Start difference. First operand 354 states and 414 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:08,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:08,249 INFO L93 Difference]: Finished difference Result 368 states and 427 transitions. [2021-05-02 13:29:08,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:29:08,250 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2021-05-02 13:29:08,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:08,252 INFO L225 Difference]: With dead ends: 368 [2021-05-02 13:29:08,252 INFO L226 Difference]: Without dead ends: 346 [2021-05-02 13:29:08,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 781.7ms TimeCoverageRelationStatistics Valid=127, Invalid=1205, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:29:08,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-05-02 13:29:08,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 344. [2021-05-02 13:29:08,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 290 states have (on average 1.1793103448275861) internal successors, (342), 320 states have internal predecessors, (342), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (36), 18 states have call predecessors, (36), 18 states have call successors, (36) [2021-05-02 13:29:08,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 398 transitions. [2021-05-02 13:29:08,295 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 398 transitions. Word has length 47 [2021-05-02 13:29:08,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:08,295 INFO L480 AbstractCegarLoop]: Abstraction has 344 states and 398 transitions. [2021-05-02 13:29:08,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 24 states have internal predecessors, (48), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:08,295 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 398 transitions. [2021-05-02 13:29:08,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 13:29:08,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:08,297 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:08,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:08,513 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:08,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:08,513 INFO L82 PathProgramCache]: Analyzing trace with hash -448253169, now seen corresponding path program 39 times [2021-05-02 13:29:08,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:08,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085502942] [2021-05-02 13:29:08,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:08,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:08,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:08,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:08,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:08,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:08,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:29:08,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:08,852 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:08,852 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:08,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085502942] [2021-05-02 13:29:08,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085502942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:08,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43348221] [2021-05-02 13:29:08,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:08,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:29:08,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:08,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:29:08,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:08,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:08,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:08,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:08,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:09,434 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:09,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43348221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:09,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:09,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 35 [2021-05-02 13:29:09,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518947873] [2021-05-02 13:29:09,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:29:09,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:09,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:29:09,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=1108, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:29:09,435 INFO L87 Difference]: Start difference. First operand 344 states and 398 transitions. Second operand has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:11,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:11,703 INFO L93 Difference]: Finished difference Result 410 states and 477 transitions. [2021-05-02 13:29:11,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:29:11,704 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 48 [2021-05-02 13:29:11,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:11,706 INFO L225 Difference]: With dead ends: 410 [2021-05-02 13:29:11,706 INFO L226 Difference]: Without dead ends: 396 [2021-05-02 13:29:11,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 1380.8ms TimeCoverageRelationStatistics Valid=175, Invalid=2581, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:29:11,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2021-05-02 13:29:11,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 387. [2021-05-02 13:29:11,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 327 states have (on average 1.1773700305810397) internal successors, (385), 361 states have internal predecessors, (385), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (42), 20 states have call predecessors, (42), 20 states have call successors, (42) [2021-05-02 13:29:11,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 449 transitions. [2021-05-02 13:29:11,759 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 449 transitions. Word has length 48 [2021-05-02 13:29:11,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:11,759 INFO L480 AbstractCegarLoop]: Abstraction has 387 states and 449 transitions. [2021-05-02 13:29:11,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:11,760 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 449 transitions. [2021-05-02 13:29:11,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 13:29:11,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:11,763 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:11,987 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:11,987 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:11,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:11,987 INFO L82 PathProgramCache]: Analyzing trace with hash 827987660, now seen corresponding path program 40 times [2021-05-02 13:29:11,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:11,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731545897] [2021-05-02 13:29:11,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:11,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:12,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:12,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:12,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:12,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:12,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:12,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:12,343 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:12,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:12,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731545897] [2021-05-02 13:29:12,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731545897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:12,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405026717] [2021-05-02 13:29:12,343 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:12,385 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:12,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:12,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:29:12,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:12,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:12,892 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:12,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405026717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:12,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:12,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 35 [2021-05-02 13:29:12,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261905863] [2021-05-02 13:29:12,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:29:12,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:12,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:29:12,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=1108, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:29:12,894 INFO L87 Difference]: Start difference. First operand 387 states and 449 transitions. Second operand has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:14,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:14,859 INFO L93 Difference]: Finished difference Result 402 states and 464 transitions. [2021-05-02 13:29:14,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:29:14,859 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 48 [2021-05-02 13:29:14,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:14,861 INFO L225 Difference]: With dead ends: 402 [2021-05-02 13:29:14,861 INFO L226 Difference]: Without dead ends: 390 [2021-05-02 13:29:14,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 1393.6ms TimeCoverageRelationStatistics Valid=175, Invalid=2581, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:29:14,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-05-02 13:29:14,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 388. [2021-05-02 13:29:14,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 328 states have (on average 1.1768292682926829) internal successors, (386), 362 states have internal predecessors, (386), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (39), 20 states have call predecessors, (39), 20 states have call successors, (39) [2021-05-02 13:29:14,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 447 transitions. [2021-05-02 13:29:14,912 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 447 transitions. Word has length 48 [2021-05-02 13:29:14,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:14,913 INFO L480 AbstractCegarLoop]: Abstraction has 388 states and 447 transitions. [2021-05-02 13:29:14,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.7714285714285714) internal successors, (62), 34 states have internal predecessors, (62), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:14,913 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 447 transitions. [2021-05-02 13:29:14,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 13:29:14,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:14,916 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:15,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:15,129 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:15,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:15,129 INFO L82 PathProgramCache]: Analyzing trace with hash 179082418, now seen corresponding path program 41 times [2021-05-02 13:29:15,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:15,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053166162] [2021-05-02 13:29:15,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:15,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:15,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:15,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:15,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:15,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:15,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:29:15,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:15,225 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:15,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:15,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053166162] [2021-05-02 13:29:15,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053166162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:15,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824757914] [2021-05-02 13:29:15,226 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:15,274 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:29:15,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:15,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:29:15,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:15,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:15,389 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:15,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824757914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:15,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:15,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 16 [2021-05-02 13:29:15,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307208649] [2021-05-02 13:29:15,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:29:15,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:15,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:29:15,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:29:15,390 INFO L87 Difference]: Start difference. First operand 388 states and 447 transitions. Second operand has 16 states, 16 states have (on average 3.125) internal successors, (50), 15 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:16,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:16,003 INFO L93 Difference]: Finished difference Result 593 states and 672 transitions. [2021-05-02 13:29:16,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:29:16,004 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.125) internal successors, (50), 15 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 48 [2021-05-02 13:29:16,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:16,006 INFO L225 Difference]: With dead ends: 593 [2021-05-02 13:29:16,006 INFO L226 Difference]: Without dead ends: 383 [2021-05-02 13:29:16,008 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 460.8ms TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:29:16,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-05-02 13:29:16,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 375. [2021-05-02 13:29:16,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 321 states have (on average 1.1682242990654206) internal successors, (375), 351 states have internal predecessors, (375), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (33), 18 states have call predecessors, (33), 18 states have call successors, (33) [2021-05-02 13:29:16,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 428 transitions. [2021-05-02 13:29:16,059 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 428 transitions. Word has length 48 [2021-05-02 13:29:16,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:16,059 INFO L480 AbstractCegarLoop]: Abstraction has 375 states and 428 transitions. [2021-05-02 13:29:16,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.125) internal successors, (50), 15 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:16,059 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 428 transitions. [2021-05-02 13:29:16,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 13:29:16,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:16,062 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:16,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-05-02 13:29:16,277 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:16,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:16,277 INFO L82 PathProgramCache]: Analyzing trace with hash 2046793773, now seen corresponding path program 42 times [2021-05-02 13:29:16,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:16,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504388751] [2021-05-02 13:29:16,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:16,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:16,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:16,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:16,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:16,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:16,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:16,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:16,366 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:16,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:16,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504388751] [2021-05-02 13:29:16,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504388751] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:16,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563860672] [2021-05-02 13:29:16,367 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:16,417 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 13:29:16,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:16,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:29:16,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:16,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:16,537 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:16,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563860672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:16,537 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:16,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 16 [2021-05-02 13:29:16,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733841576] [2021-05-02 13:29:16,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:29:16,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:16,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:29:16,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:29:16,538 INFO L87 Difference]: Start difference. First operand 375 states and 428 transitions. Second operand has 16 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:29:17,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:17,224 INFO L93 Difference]: Finished difference Result 409 states and 468 transitions. [2021-05-02 13:29:17,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:29:17,224 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 48 [2021-05-02 13:29:17,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:17,226 INFO L225 Difference]: With dead ends: 409 [2021-05-02 13:29:17,226 INFO L226 Difference]: Without dead ends: 382 [2021-05-02 13:29:17,228 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 535.0ms TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:29:17,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-05-02 13:29:17,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 382. [2021-05-02 13:29:17,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 328 states have (on average 1.1646341463414633) internal successors, (382), 358 states have internal predecessors, (382), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (33), 18 states have call predecessors, (33), 18 states have call successors, (33) [2021-05-02 13:29:17,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 435 transitions. [2021-05-02 13:29:17,271 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 435 transitions. Word has length 48 [2021-05-02 13:29:17,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:17,271 INFO L480 AbstractCegarLoop]: Abstraction has 382 states and 435 transitions. [2021-05-02 13:29:17,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:29:17,271 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 435 transitions. [2021-05-02 13:29:17,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:29:17,273 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:17,273 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:17,474 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:17,474 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:17,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:17,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1121658739, now seen corresponding path program 43 times [2021-05-02 13:29:17,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:17,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130538075] [2021-05-02 13:29:17,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:17,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:17,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:17,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:17,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:17,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:17,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:17,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:17,985 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:29:17,985 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:17,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130538075] [2021-05-02 13:29:17,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [130538075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:17,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618905294] [2021-05-02 13:29:17,986 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:18,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:18,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:29:18,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:18,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:18,344 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:29:18,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618905294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:18,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:18,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 37 [2021-05-02 13:29:18,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614297689] [2021-05-02 13:29:18,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:29:18,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:18,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:29:18,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1251, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:29:18,345 INFO L87 Difference]: Start difference. First operand 382 states and 435 transitions. Second operand has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:21,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:21,322 INFO L93 Difference]: Finished difference Result 460 states and 524 transitions. [2021-05-02 13:29:21,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:29:21,322 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 49 [2021-05-02 13:29:21,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:21,324 INFO L225 Difference]: With dead ends: 460 [2021-05-02 13:29:21,324 INFO L226 Difference]: Without dead ends: 454 [2021-05-02 13:29:21,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 1685.2ms TimeCoverageRelationStatistics Valid=229, Invalid=4061, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:29:21,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-05-02 13:29:21,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 398. [2021-05-02 13:29:21,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 341 states have (on average 1.1642228739002933) internal successors, (397), 373 states have internal predecessors, (397), 21 states have call successors, (21), 5 states have call predecessors, (21), 35 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) [2021-05-02 13:29:21,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 454 transitions. [2021-05-02 13:29:21,368 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 454 transitions. Word has length 49 [2021-05-02 13:29:21,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:21,368 INFO L480 AbstractCegarLoop]: Abstraction has 398 states and 454 transitions. [2021-05-02 13:29:21,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:21,369 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 454 transitions. [2021-05-02 13:29:21,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:29:21,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:21,372 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:21,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:21,585 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:21,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:21,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1142562995, now seen corresponding path program 44 times [2021-05-02 13:29:21,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:21,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96521968] [2021-05-02 13:29:21,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:21,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:21,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:21,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:21,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:21,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:21,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:21,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:22,077 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:29:22,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:22,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96521968] [2021-05-02 13:29:22,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96521968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:22,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087712721] [2021-05-02 13:29:22,078 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:22,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:22,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:22,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 13:29:22,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:22,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:22,531 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:29:22,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087712721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:22,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:22,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 37 [2021-05-02 13:29:22,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730576665] [2021-05-02 13:29:22,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:29:22,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:22,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:29:22,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1247, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:29:22,532 INFO L87 Difference]: Start difference. First operand 398 states and 454 transitions. Second operand has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:24,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:24,841 INFO L93 Difference]: Finished difference Result 404 states and 459 transitions. [2021-05-02 13:29:24,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:29:24,841 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 49 [2021-05-02 13:29:24,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:24,843 INFO L225 Difference]: With dead ends: 404 [2021-05-02 13:29:24,843 INFO L226 Difference]: Without dead ends: 382 [2021-05-02 13:29:24,844 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 1637.0ms TimeCoverageRelationStatistics Valid=231, Invalid=3801, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:29:24,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-05-02 13:29:24,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 382. [2021-05-02 13:29:24,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 328 states have (on average 1.1646341463414633) internal successors, (382), 358 states have internal predecessors, (382), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (34), 18 states have call predecessors, (34), 18 states have call successors, (34) [2021-05-02 13:29:24,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 436 transitions. [2021-05-02 13:29:24,886 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 436 transitions. Word has length 49 [2021-05-02 13:29:24,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:24,886 INFO L480 AbstractCegarLoop]: Abstraction has 382 states and 436 transitions. [2021-05-02 13:29:24,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:24,887 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 436 transitions. [2021-05-02 13:29:24,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:29:24,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:24,888 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:25,089 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-05-02 13:29:25,089 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:25,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:25,089 INFO L82 PathProgramCache]: Analyzing trace with hash 690493581, now seen corresponding path program 45 times [2021-05-02 13:29:25,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:25,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759427318] [2021-05-02 13:29:25,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:25,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:25,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:25,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:25,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:25,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:25,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:25,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:25,518 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:29:25,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:25,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759427318] [2021-05-02 13:29:25,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759427318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:25,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318633623] [2021-05-02 13:29:25,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:25,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:29:25,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:25,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:29:25,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:25,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:25,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:25,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:25,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:25,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:25,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:25,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:29:26,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318633623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:26,036 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:26,036 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 37 [2021-05-02 13:29:26,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415834533] [2021-05-02 13:29:26,036 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:29:26,036 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:26,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:29:26,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1243, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:29:26,037 INFO L87 Difference]: Start difference. First operand 382 states and 436 transitions. Second operand has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:27,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:27,850 INFO L93 Difference]: Finished difference Result 388 states and 441 transitions. [2021-05-02 13:29:27,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:29:27,851 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 49 [2021-05-02 13:29:27,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:27,852 INFO L225 Difference]: With dead ends: 388 [2021-05-02 13:29:27,852 INFO L226 Difference]: Without dead ends: 364 [2021-05-02 13:29:27,856 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 1562.4ms TimeCoverageRelationStatistics Valid=233, Invalid=3549, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:29:27,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-05-02 13:29:27,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 364. [2021-05-02 13:29:27,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 313 states have (on average 1.1661341853035143) internal successors, (365), 341 states have internal predecessors, (365), 19 states have call successors, (19), 5 states have call predecessors, (19), 31 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2021-05-02 13:29:27,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 416 transitions. [2021-05-02 13:29:27,901 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 416 transitions. Word has length 49 [2021-05-02 13:29:27,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:27,901 INFO L480 AbstractCegarLoop]: Abstraction has 364 states and 416 transitions. [2021-05-02 13:29:27,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:27,902 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 416 transitions. [2021-05-02 13:29:27,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:29:27,903 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:27,903 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:28,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:28,105 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:28,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:28,105 INFO L82 PathProgramCache]: Analyzing trace with hash 375234381, now seen corresponding path program 46 times [2021-05-02 13:29:28,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:28,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301034572] [2021-05-02 13:29:28,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:28,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:28,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:28,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:28,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:28,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:28,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:28,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:28,481 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:29:28,481 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:28,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301034572] [2021-05-02 13:29:28,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301034572] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:28,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844908775] [2021-05-02 13:29:28,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:28,532 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:28,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:28,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:29:28,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:28,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:28,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:28,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:28,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:28,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:28,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:28,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:29,039 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:29:29,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844908775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:29,040 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:29,040 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 37 [2021-05-02 13:29:29,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133842440] [2021-05-02 13:29:29,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:29:29,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:29,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:29:29,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1239, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:29:29,041 INFO L87 Difference]: Start difference. First operand 364 states and 416 transitions. Second operand has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:30,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:30,421 INFO L93 Difference]: Finished difference Result 382 states and 437 transitions. [2021-05-02 13:29:30,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:29:30,431 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 49 [2021-05-02 13:29:30,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:30,433 INFO L225 Difference]: With dead ends: 382 [2021-05-02 13:29:30,433 INFO L226 Difference]: Without dead ends: 376 [2021-05-02 13:29:30,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 1493.9ms TimeCoverageRelationStatistics Valid=235, Invalid=3305, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:29:30,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-05-02 13:29:30,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 374. [2021-05-02 13:29:30,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 320 states have (on average 1.16875) internal successors, (374), 350 states have internal predecessors, (374), 20 states have call successors, (20), 5 states have call predecessors, (20), 33 states have return successors, (35), 18 states have call predecessors, (35), 18 states have call successors, (35) [2021-05-02 13:29:30,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2021-05-02 13:29:30,472 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 49 [2021-05-02 13:29:30,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:30,472 INFO L480 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2021-05-02 13:29:30,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 31 states have internal predecessors, (49), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:30,472 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2021-05-02 13:29:30,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:29:30,474 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:30,474 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:30,674 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2021-05-02 13:29:30,675 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:30,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:30,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1431154964, now seen corresponding path program 47 times [2021-05-02 13:29:30,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:30,675 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138652575] [2021-05-02 13:29:30,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:30,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:30,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:30,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:30,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:30,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:30,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:30,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:31,037 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:31,038 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:31,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138652575] [2021-05-02 13:29:31,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138652575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:31,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739728151] [2021-05-02 13:29:31,038 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:31,096 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:29:31,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:31,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:29:31,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:31,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:31,761 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:31,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739728151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:31,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:31,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21] total 39 [2021-05-02 13:29:31,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802740121] [2021-05-02 13:29:31,762 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:29:31,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:31,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:29:31,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=1390, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:29:31,762 INFO L87 Difference]: Start difference. First operand 374 states and 429 transitions. Second operand has 39 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 38 states have internal predecessors, (66), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:34,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:34,652 INFO L93 Difference]: Finished difference Result 442 states and 510 transitions. [2021-05-02 13:29:34,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:29:34,652 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 38 states have internal predecessors, (66), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2021-05-02 13:29:34,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:34,654 INFO L225 Difference]: With dead ends: 442 [2021-05-02 13:29:34,654 INFO L226 Difference]: Without dead ends: 428 [2021-05-02 13:29:34,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 1716.3ms TimeCoverageRelationStatistics Valid=195, Invalid=3227, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:29:34,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-05-02 13:29:34,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 419. [2021-05-02 13:29:34,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 359 states have (on average 1.1671309192200556) internal successors, (419), 393 states have internal predecessors, (419), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (41), 20 states have call predecessors, (41), 20 states have call successors, (41) [2021-05-02 13:29:34,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 482 transitions. [2021-05-02 13:29:34,699 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 482 transitions. Word has length 50 [2021-05-02 13:29:34,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:34,699 INFO L480 AbstractCegarLoop]: Abstraction has 419 states and 482 transitions. [2021-05-02 13:29:34,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 38 states have internal predecessors, (66), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:34,699 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 482 transitions. [2021-05-02 13:29:34,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:29:34,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:34,702 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:34,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:34,902 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:34,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:34,903 INFO L82 PathProgramCache]: Analyzing trace with hash -522394929, now seen corresponding path program 48 times [2021-05-02 13:29:34,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:34,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307382165] [2021-05-02 13:29:34,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:34,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:34,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:34,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:34,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:34,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:35,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:29:35,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:35,240 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:35,241 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:35,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307382165] [2021-05-02 13:29:35,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307382165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:35,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850678371] [2021-05-02 13:29:35,241 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:35,292 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:29:35,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:35,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:29:35,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:35,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,961 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:29:35,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850678371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:35,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:35,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21] total 39 [2021-05-02 13:29:35,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939115550] [2021-05-02 13:29:35,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:29:35,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:35,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:29:35,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=1390, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:29:35,962 INFO L87 Difference]: Start difference. First operand 419 states and 482 transitions. Second operand has 39 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 38 states have internal predecessors, (66), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:38,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:38,659 INFO L93 Difference]: Finished difference Result 434 states and 497 transitions. [2021-05-02 13:29:38,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:29:38,660 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 38 states have internal predecessors, (66), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2021-05-02 13:29:38,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:38,662 INFO L225 Difference]: With dead ends: 434 [2021-05-02 13:29:38,662 INFO L226 Difference]: Without dead ends: 422 [2021-05-02 13:29:38,664 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1669.5ms TimeCoverageRelationStatistics Valid=195, Invalid=3227, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:29:38,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2021-05-02 13:29:38,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 420. [2021-05-02 13:29:38,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 360 states have (on average 1.1666666666666667) internal successors, (420), 394 states have internal predecessors, (420), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (38), 20 states have call predecessors, (38), 20 states have call successors, (38) [2021-05-02 13:29:38,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 480 transitions. [2021-05-02 13:29:38,709 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 480 transitions. Word has length 50 [2021-05-02 13:29:38,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:38,710 INFO L480 AbstractCegarLoop]: Abstraction has 420 states and 480 transitions. [2021-05-02 13:29:38,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 38 states have internal predecessors, (66), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:38,710 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 480 transitions. [2021-05-02 13:29:38,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:29:38,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:38,712 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:38,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-05-02 13:29:38,914 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:38,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:38,914 INFO L82 PathProgramCache]: Analyzing trace with hash 96500781, now seen corresponding path program 49 times [2021-05-02 13:29:38,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:38,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027640913] [2021-05-02 13:29:38,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:38,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:38,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:38,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:38,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:38,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:38,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:38,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:39,035 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:39,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:39,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027640913] [2021-05-02 13:29:39,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027640913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:39,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421001348] [2021-05-02 13:29:39,036 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:39,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:39,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:29:39,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:39,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,282 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:39,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421001348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:39,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:39,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 18 [2021-05-02 13:29:39,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884399118] [2021-05-02 13:29:39,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:29:39,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:39,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:29:39,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:29:39,283 INFO L87 Difference]: Start difference. First operand 420 states and 480 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:29:40,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:40,230 INFO L93 Difference]: Finished difference Result 540 states and 625 transitions. [2021-05-02 13:29:40,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:29:40,231 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 50 [2021-05-02 13:29:40,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:40,232 INFO L225 Difference]: With dead ends: 540 [2021-05-02 13:29:40,232 INFO L226 Difference]: Without dead ends: 502 [2021-05-02 13:29:40,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 817.7ms TimeCoverageRelationStatistics Valid=372, Invalid=1034, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:29:40,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-02 13:29:40,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 478. [2021-05-02 13:29:40,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 418 states have (on average 1.1650717703349283) internal successors, (487), 452 states have internal predecessors, (487), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (38), 20 states have call predecessors, (38), 20 states have call successors, (38) [2021-05-02 13:29:40,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 547 transitions. [2021-05-02 13:29:40,296 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 547 transitions. Word has length 50 [2021-05-02 13:29:40,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:40,296 INFO L480 AbstractCegarLoop]: Abstraction has 478 states and 547 transitions. [2021-05-02 13:29:40,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:29:40,296 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 547 transitions. [2021-05-02 13:29:40,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:29:40,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:40,299 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:40,499 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:40,500 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:40,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:40,500 INFO L82 PathProgramCache]: Analyzing trace with hash -2133989358, now seen corresponding path program 50 times [2021-05-02 13:29:40,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:40,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253856335] [2021-05-02 13:29:40,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:40,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:40,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:40,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:40,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:40,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:40,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:29:40,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:40,599 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:40,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253856335] [2021-05-02 13:29:40,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253856335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:40,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194814288] [2021-05-02 13:29:40,599 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:40,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:40,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:40,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:29:40,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:40,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,800 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:29:40,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194814288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:40,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:40,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 18 [2021-05-02 13:29:40,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832151848] [2021-05-02 13:29:40,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:29:40,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:40,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:29:40,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:29:40,801 INFO L87 Difference]: Start difference. First operand 478 states and 547 transitions. Second operand has 18 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 17 states have internal predecessors, (53), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:41,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:41,770 INFO L93 Difference]: Finished difference Result 857 states and 980 transitions. [2021-05-02 13:29:41,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:29:41,770 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 17 states have internal predecessors, (53), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 50 [2021-05-02 13:29:41,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:41,777 INFO L225 Difference]: With dead ends: 857 [2021-05-02 13:29:41,777 INFO L226 Difference]: Without dead ends: 560 [2021-05-02 13:29:41,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 780.9ms TimeCoverageRelationStatistics Valid=372, Invalid=1034, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:29:41,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2021-05-02 13:29:41,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 536. [2021-05-02 13:29:41,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 476 states have (on average 1.1638655462184875) internal successors, (554), 510 states have internal predecessors, (554), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (38), 20 states have call predecessors, (38), 20 states have call successors, (38) [2021-05-02 13:29:41,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 614 transitions. [2021-05-02 13:29:41,871 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 614 transitions. Word has length 50 [2021-05-02 13:29:41,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:41,871 INFO L480 AbstractCegarLoop]: Abstraction has 536 states and 614 transitions. [2021-05-02 13:29:41,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 17 states have internal predecessors, (53), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:41,871 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 614 transitions. [2021-05-02 13:29:41,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:29:41,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:41,873 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:42,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:42,074 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:42,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:42,074 INFO L82 PathProgramCache]: Analyzing trace with hash -33846038, now seen corresponding path program 51 times [2021-05-02 13:29:42,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:42,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271590599] [2021-05-02 13:29:42,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:42,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:42,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:42,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:42,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:42,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:42,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:29:42,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:42,728 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:29:42,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:42,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271590599] [2021-05-02 13:29:42,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271590599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:42,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418251788] [2021-05-02 13:29:42,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:42,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:29:42,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:42,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:29:42,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:42,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:42,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,110 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:29:43,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418251788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:43,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:43,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 39 [2021-05-02 13:29:43,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009502359] [2021-05-02 13:29:43,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:29:43,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:43,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:29:43,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1397, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:29:43,111 INFO L87 Difference]: Start difference. First operand 536 states and 614 transitions. Second operand has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:46,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:46,597 INFO L93 Difference]: Finished difference Result 628 states and 719 transitions. [2021-05-02 13:29:46,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:29:46,598 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-05-02 13:29:46,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:46,601 INFO L225 Difference]: With dead ends: 628 [2021-05-02 13:29:46,601 INFO L226 Difference]: Without dead ends: 622 [2021-05-02 13:29:46,602 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 1957.8ms TimeCoverageRelationStatistics Valid=241, Invalid=4589, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:29:46,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-05-02 13:29:46,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 552. [2021-05-02 13:29:46,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 552 states, 489 states have (on average 1.16359918200409) internal successors, (569), 525 states have internal predecessors, (569), 23 states have call successors, (23), 5 states have call predecessors, (23), 39 states have return successors, (41), 21 states have call predecessors, (41), 21 states have call successors, (41) [2021-05-02 13:29:46,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 633 transitions. [2021-05-02 13:29:46,668 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 633 transitions. Word has length 51 [2021-05-02 13:29:46,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:46,668 INFO L480 AbstractCegarLoop]: Abstraction has 552 states and 633 transitions. [2021-05-02 13:29:46,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:46,668 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 633 transitions. [2021-05-02 13:29:46,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:29:46,670 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:46,670 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:46,872 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,52 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:46,873 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:46,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:46,873 INFO L82 PathProgramCache]: Analyzing trace with hash 2139086154, now seen corresponding path program 52 times [2021-05-02 13:29:46,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:46,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532497262] [2021-05-02 13:29:46,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:46,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:46,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:46,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:46,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:46,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:47,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:29:47,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:47,508 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:29:47,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:47,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532497262] [2021-05-02 13:29:47,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532497262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:47,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339277100] [2021-05-02 13:29:47,508 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:47,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:47,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:47,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:29:47,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:47,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:47,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,095 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:29:48,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339277100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:48,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:48,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 39 [2021-05-02 13:29:48,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058680035] [2021-05-02 13:29:48,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:29:48,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:48,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:29:48,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1393, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:29:48,096 INFO L87 Difference]: Start difference. First operand 552 states and 633 transitions. Second operand has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:50,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:50,951 INFO L93 Difference]: Finished difference Result 558 states and 638 transitions. [2021-05-02 13:29:50,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:29:50,952 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-05-02 13:29:50,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:50,954 INFO L225 Difference]: With dead ends: 558 [2021-05-02 13:29:50,954 INFO L226 Difference]: Without dead ends: 536 [2021-05-02 13:29:50,956 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 2027.4ms TimeCoverageRelationStatistics Valid=243, Invalid=4313, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:29:50,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-05-02 13:29:51,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 536. [2021-05-02 13:29:51,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 476 states have (on average 1.1638655462184875) internal successors, (554), 510 states have internal predecessors, (554), 22 states have call successors, (22), 5 states have call predecessors, (22), 37 states have return successors, (39), 20 states have call predecessors, (39), 20 states have call successors, (39) [2021-05-02 13:29:51,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 615 transitions. [2021-05-02 13:29:51,029 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 615 transitions. Word has length 51 [2021-05-02 13:29:51,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:51,030 INFO L480 AbstractCegarLoop]: Abstraction has 536 states and 615 transitions. [2021-05-02 13:29:51,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:51,030 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 615 transitions. [2021-05-02 13:29:51,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:29:51,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:51,033 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:51,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:51,248 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:51,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:51,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1318950550, now seen corresponding path program 53 times [2021-05-02 13:29:51,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:51,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577967732] [2021-05-02 13:29:51,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:51,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:51,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:51,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:51,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:51,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:51,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:29:51,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:51,801 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:29:51,801 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:51,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577967732] [2021-05-02 13:29:51,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577967732] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:51,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698264679] [2021-05-02 13:29:51,801 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:51,853 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:29:51,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:51,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 13:29:51,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:52,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:52,363 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:29:52,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698264679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:52,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:52,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 39 [2021-05-02 13:29:52,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016344788] [2021-05-02 13:29:52,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:29:52,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:52,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:29:52,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1389, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:29:52,365 INFO L87 Difference]: Start difference. First operand 536 states and 615 transitions. Second operand has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:54,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:54,547 INFO L93 Difference]: Finished difference Result 542 states and 620 transitions. [2021-05-02 13:29:54,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:29:54,547 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-05-02 13:29:54,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:54,549 INFO L225 Difference]: With dead ends: 542 [2021-05-02 13:29:54,549 INFO L226 Difference]: Without dead ends: 518 [2021-05-02 13:29:54,551 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1855.6ms TimeCoverageRelationStatistics Valid=245, Invalid=4045, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:29:54,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-05-02 13:29:54,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 518. [2021-05-02 13:29:54,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 518 states, 461 states have (on average 1.1648590021691974) internal successors, (537), 493 states have internal predecessors, (537), 21 states have call successors, (21), 5 states have call predecessors, (21), 35 states have return successors, (37), 19 states have call predecessors, (37), 19 states have call successors, (37) [2021-05-02 13:29:54,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 518 states to 518 states and 595 transitions. [2021-05-02 13:29:54,641 INFO L78 Accepts]: Start accepts. Automaton has 518 states and 595 transitions. Word has length 51 [2021-05-02 13:29:54,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:54,641 INFO L480 AbstractCegarLoop]: Abstraction has 518 states and 595 transitions. [2021-05-02 13:29:54,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:29:54,641 INFO L276 IsEmpty]: Start isEmpty. Operand 518 states and 595 transitions. [2021-05-02 13:29:54,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:29:54,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:54,643 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:54,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2021-05-02 13:29:54,844 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:54,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:54,844 INFO L82 PathProgramCache]: Analyzing trace with hash -774418501, now seen corresponding path program 54 times [2021-05-02 13:29:54,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:54,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613267586] [2021-05-02 13:29:54,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:54,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:54,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:54,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:54,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:54,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:54,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:29:54,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:55,111 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 13:29:55,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:55,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613267586] [2021-05-02 13:29:55,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613267586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:55,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788538099] [2021-05-02 13:29:55,111 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:55,163 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:29:55,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:55,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:29:55,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:55,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:55,544 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 13:29:55,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788538099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:55,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:55,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 29 [2021-05-02 13:29:55,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346887853] [2021-05-02 13:29:55,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:29:55,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:55,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:29:55,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=743, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:29:55,546 INFO L87 Difference]: Start difference. First operand 518 states and 595 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:57,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:57,277 INFO L93 Difference]: Finished difference Result 590 states and 681 transitions. [2021-05-02 13:29:57,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:29:57,278 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 51 [2021-05-02 13:29:57,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:57,282 INFO L225 Difference]: With dead ends: 590 [2021-05-02 13:29:57,282 INFO L226 Difference]: Without dead ends: 573 [2021-05-02 13:29:57,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 991.0ms TimeCoverageRelationStatistics Valid=147, Invalid=1659, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:29:57,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-02 13:29:57,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 568. [2021-05-02 13:29:57,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 568 states, 490 states have (on average 1.153061224489796) internal successors, (565), 536 states have internal predecessors, (565), 28 states have call successors, (28), 5 states have call predecessors, (28), 49 states have return successors, (58), 26 states have call predecessors, (58), 26 states have call successors, (58) [2021-05-02 13:29:57,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 568 states to 568 states and 651 transitions. [2021-05-02 13:29:57,348 INFO L78 Accepts]: Start accepts. Automaton has 568 states and 651 transitions. Word has length 51 [2021-05-02 13:29:57,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:57,348 INFO L480 AbstractCegarLoop]: Abstraction has 568 states and 651 transitions. [2021-05-02 13:29:57,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:29:57,348 INFO L276 IsEmpty]: Start isEmpty. Operand 568 states and 651 transitions. [2021-05-02 13:29:57,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:29:57,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:57,351 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:57,551 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-05-02 13:29:57,552 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:57,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:57,552 INFO L82 PathProgramCache]: Analyzing trace with hash -103251766, now seen corresponding path program 55 times [2021-05-02 13:29:57,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:57,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298517947] [2021-05-02 13:29:57,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:57,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:57,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:29:57,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:57,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:29:57,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:57,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:29:57,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:58,055 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:29:58,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:58,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298517947] [2021-05-02 13:29:58,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298517947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:58,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714418720] [2021-05-02 13:29:58,056 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:58,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:58,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:29:58,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:58,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:58,708 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:29:58,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714418720] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:58,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:29:58,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 39 [2021-05-02 13:29:58,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415536235] [2021-05-02 13:29:58,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:29:58,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:58,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:29:58,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1385, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:29:58,710 INFO L87 Difference]: Start difference. First operand 568 states and 651 transitions. Second operand has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:00,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:00,513 INFO L93 Difference]: Finished difference Result 586 states and 673 transitions. [2021-05-02 13:30:00,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:30:00,514 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-05-02 13:30:00,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:00,516 INFO L225 Difference]: With dead ends: 586 [2021-05-02 13:30:00,516 INFO L226 Difference]: Without dead ends: 569 [2021-05-02 13:30:00,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1816.5ms TimeCoverageRelationStatistics Valid=247, Invalid=3785, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:30:00,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-02 13:30:00,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 564. [2021-05-02 13:30:00,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 564 states, 486 states have (on average 1.1563786008230452) internal successors, (562), 532 states have internal predecessors, (562), 28 states have call successors, (28), 5 states have call predecessors, (28), 49 states have return successors, (58), 26 states have call predecessors, (58), 26 states have call successors, (58) [2021-05-02 13:30:00,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 564 states to 564 states and 648 transitions. [2021-05-02 13:30:00,595 INFO L78 Accepts]: Start accepts. Automaton has 564 states and 648 transitions. Word has length 51 [2021-05-02 13:30:00,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:00,596 INFO L480 AbstractCegarLoop]: Abstraction has 564 states and 648 transitions. [2021-05-02 13:30:00,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 33 states have internal predecessors, (51), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:00,596 INFO L276 IsEmpty]: Start isEmpty. Operand 564 states and 648 transitions. [2021-05-02 13:30:00,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:30:00,600 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:00,600 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:00,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2021-05-02 13:30:00,823 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:00,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:00,824 INFO L82 PathProgramCache]: Analyzing trace with hash -2133704513, now seen corresponding path program 56 times [2021-05-02 13:30:00,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:00,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234197170] [2021-05-02 13:30:00,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:00,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:00,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:00,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:00,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:00,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:00,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:00,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:01,148 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 13:30:01,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:01,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234197170] [2021-05-02 13:30:01,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234197170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:01,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576535163] [2021-05-02 13:30:01,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:01,215 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:30:01,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:01,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:30:01,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:01,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:01,709 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 13:30:01,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576535163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:01,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:01,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 29 [2021-05-02 13:30:01,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518618597] [2021-05-02 13:30:01,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:30:01,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:01,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:30:01,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=743, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:30:01,710 INFO L87 Difference]: Start difference. First operand 564 states and 648 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:03,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:03,240 INFO L93 Difference]: Finished difference Result 578 states and 661 transitions. [2021-05-02 13:30:03,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:30:03,241 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 51 [2021-05-02 13:30:03,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:03,243 INFO L225 Difference]: With dead ends: 578 [2021-05-02 13:30:03,243 INFO L226 Difference]: Without dead ends: 554 [2021-05-02 13:30:03,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 1199.3ms TimeCoverageRelationStatistics Valid=147, Invalid=1659, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:30:03,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-05-02 13:30:03,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 552. [2021-05-02 13:30:03,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 552 states, 474 states have (on average 1.1561181434599157) internal successors, (548), 520 states have internal predecessors, (548), 28 states have call successors, (28), 5 states have call predecessors, (28), 49 states have return successors, (52), 26 states have call predecessors, (52), 26 states have call successors, (52) [2021-05-02 13:30:03,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 628 transitions. [2021-05-02 13:30:03,320 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 628 transitions. Word has length 51 [2021-05-02 13:30:03,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:03,320 INFO L480 AbstractCegarLoop]: Abstraction has 552 states and 628 transitions. [2021-05-02 13:30:03,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:03,320 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 628 transitions. [2021-05-02 13:30:03,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:30:03,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:03,322 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:03,523 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-05-02 13:30:03,523 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:03,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:03,523 INFO L82 PathProgramCache]: Analyzing trace with hash -2068699601, now seen corresponding path program 57 times [2021-05-02 13:30:03,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:03,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267195828] [2021-05-02 13:30:03,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:03,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:03,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:03,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:03,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:03,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:03,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:30:03,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:04,032 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:04,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:04,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267195828] [2021-05-02 13:30:04,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267195828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:04,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17220473] [2021-05-02 13:30:04,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:04,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:30:04,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:04,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:30:04,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:04,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:04,960 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:04,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17220473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:04,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:04,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23] total 43 [2021-05-02 13:30:04,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835423969] [2021-05-02 13:30:04,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:30:04,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:04,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:30:04,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1704, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:30:04,961 INFO L87 Difference]: Start difference. First operand 552 states and 628 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:08,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:08,709 INFO L93 Difference]: Finished difference Result 642 states and 735 transitions. [2021-05-02 13:30:08,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:30:08,709 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 52 [2021-05-02 13:30:08,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:08,713 INFO L225 Difference]: With dead ends: 642 [2021-05-02 13:30:08,713 INFO L226 Difference]: Without dead ends: 628 [2021-05-02 13:30:08,716 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 2272.4ms TimeCoverageRelationStatistics Valid=215, Invalid=3945, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:30:08,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-05-02 13:30:08,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 619. [2021-05-02 13:30:08,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 532 states have (on average 1.1541353383458646) internal successors, (614), 584 states have internal predecessors, (614), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (61), 29 states have call predecessors, (61), 29 states have call successors, (61) [2021-05-02 13:30:08,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 706 transitions. [2021-05-02 13:30:08,832 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 706 transitions. Word has length 52 [2021-05-02 13:30:08,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:08,832 INFO L480 AbstractCegarLoop]: Abstraction has 619 states and 706 transitions. [2021-05-02 13:30:08,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:08,833 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 706 transitions. [2021-05-02 13:30:08,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:30:08,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:08,837 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:09,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:09,053 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:09,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:09,053 INFO L82 PathProgramCache]: Analyzing trace with hash 333057708, now seen corresponding path program 58 times [2021-05-02 13:30:09,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:09,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943035351] [2021-05-02 13:30:09,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:09,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:09,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:09,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:09,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:09,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:09,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:09,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:09,486 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:09,486 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:09,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943035351] [2021-05-02 13:30:09,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943035351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:09,487 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469729969] [2021-05-02 13:30:09,487 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:09,531 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:30:09,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:09,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:30:09,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:09,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:09,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:10,366 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:10,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469729969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:10,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:10,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23] total 43 [2021-05-02 13:30:10,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049214531] [2021-05-02 13:30:10,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:30:10,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:10,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:30:10,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1704, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:30:10,367 INFO L87 Difference]: Start difference. First operand 619 states and 706 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:14,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:14,097 INFO L93 Difference]: Finished difference Result 634 states and 721 transitions. [2021-05-02 13:30:14,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:30:14,098 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 52 [2021-05-02 13:30:14,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:14,101 INFO L225 Difference]: With dead ends: 634 [2021-05-02 13:30:14,101 INFO L226 Difference]: Without dead ends: 622 [2021-05-02 13:30:14,103 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 2167.1ms TimeCoverageRelationStatistics Valid=215, Invalid=3945, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:30:14,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-05-02 13:30:14,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 620. [2021-05-02 13:30:14,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 620 states, 533 states have (on average 1.1538461538461537) internal successors, (615), 585 states have internal predecessors, (615), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (57), 29 states have call predecessors, (57), 29 states have call successors, (57) [2021-05-02 13:30:14,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 703 transitions. [2021-05-02 13:30:14,177 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 703 transitions. Word has length 52 [2021-05-02 13:30:14,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:14,177 INFO L480 AbstractCegarLoop]: Abstraction has 620 states and 703 transitions. [2021-05-02 13:30:14,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:14,177 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 703 transitions. [2021-05-02 13:30:14,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:30:14,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:14,181 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:14,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-05-02 13:30:14,404 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:14,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:14,404 INFO L82 PathProgramCache]: Analyzing trace with hash -765588306, now seen corresponding path program 59 times [2021-05-02 13:30:14,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:14,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639344730] [2021-05-02 13:30:14,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:14,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:14,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:14,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:14,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:14,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:14,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:30:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:14,537 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:14,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:14,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639344730] [2021-05-02 13:30:14,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639344730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:14,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775726289] [2021-05-02 13:30:14,537 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:14,593 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:30:14,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:14,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:30:14,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:14,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,758 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:14,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775726289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:14,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:14,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 19 [2021-05-02 13:30:14,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88398334] [2021-05-02 13:30:14,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:30:14,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:14,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:30:14,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:30:14,759 INFO L87 Difference]: Start difference. First operand 620 states and 703 transitions. Second operand has 19 states, 19 states have (on average 2.789473684210526) internal successors, (53), 18 states have internal predecessors, (53), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:15,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:15,714 INFO L93 Difference]: Finished difference Result 944 states and 1054 transitions. [2021-05-02 13:30:15,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:30:15,715 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.789473684210526) internal successors, (53), 18 states have internal predecessors, (53), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 52 [2021-05-02 13:30:15,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:15,720 INFO L225 Difference]: With dead ends: 944 [2021-05-02 13:30:15,720 INFO L226 Difference]: Without dead ends: 617 [2021-05-02 13:30:15,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 739.1ms TimeCoverageRelationStatistics Valid=494, Invalid=1066, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:30:15,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2021-05-02 13:30:15,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 609. [2021-05-02 13:30:15,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 609 states, 528 states have (on average 1.1477272727272727) internal successors, (606), 576 states have internal predecessors, (606), 29 states have call successors, (29), 5 states have call predecessors, (29), 51 states have return successors, (51), 27 states have call predecessors, (51), 27 states have call successors, (51) [2021-05-02 13:30:15,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 609 states to 609 states and 686 transitions. [2021-05-02 13:30:15,797 INFO L78 Accepts]: Start accepts. Automaton has 609 states and 686 transitions. Word has length 52 [2021-05-02 13:30:15,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:15,797 INFO L480 AbstractCegarLoop]: Abstraction has 609 states and 686 transitions. [2021-05-02 13:30:15,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.789473684210526) internal successors, (53), 18 states have internal predecessors, (53), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:15,797 INFO L276 IsEmpty]: Start isEmpty. Operand 609 states and 686 transitions. [2021-05-02 13:30:15,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:30:15,799 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:15,799 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:16,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:16,000 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:16,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:16,000 INFO L82 PathProgramCache]: Analyzing trace with hash 295087821, now seen corresponding path program 60 times [2021-05-02 13:30:16,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:16,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019684552] [2021-05-02 13:30:16,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:16,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:16,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:16,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:16,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:16,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:16,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:16,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:16,129 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:16,129 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:16,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019684552] [2021-05-02 13:30:16,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019684552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:16,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527300898] [2021-05-02 13:30:16,129 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:16,182 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:30:16,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:16,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:30:16,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:16,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:16,401 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:16,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527300898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:16,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:16,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 19 [2021-05-02 13:30:16,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080361068] [2021-05-02 13:30:16,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:30:16,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:16,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:30:16,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:30:16,402 INFO L87 Difference]: Start difference. First operand 609 states and 686 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:30:17,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:17,335 INFO L93 Difference]: Finished difference Result 651 states and 736 transitions. [2021-05-02 13:30:17,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:30:17,336 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 52 [2021-05-02 13:30:17,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:17,338 INFO L225 Difference]: With dead ends: 651 [2021-05-02 13:30:17,338 INFO L226 Difference]: Without dead ends: 618 [2021-05-02 13:30:17,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 800.9ms TimeCoverageRelationStatistics Valid=494, Invalid=1066, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:30:17,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2021-05-02 13:30:17,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 618. [2021-05-02 13:30:17,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 618 states, 537 states have (on average 1.1452513966480447) internal successors, (615), 585 states have internal predecessors, (615), 29 states have call successors, (29), 5 states have call predecessors, (29), 51 states have return successors, (51), 27 states have call predecessors, (51), 27 states have call successors, (51) [2021-05-02 13:30:17,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 618 states to 618 states and 695 transitions. [2021-05-02 13:30:17,420 INFO L78 Accepts]: Start accepts. Automaton has 618 states and 695 transitions. Word has length 52 [2021-05-02 13:30:17,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:17,420 INFO L480 AbstractCegarLoop]: Abstraction has 618 states and 695 transitions. [2021-05-02 13:30:17,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:30:17,420 INFO L276 IsEmpty]: Start isEmpty. Operand 618 states and 695 transitions. [2021-05-02 13:30:17,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:30:17,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:17,424 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:17,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable109 [2021-05-02 13:30:17,641 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:17,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:17,641 INFO L82 PathProgramCache]: Analyzing trace with hash 715381933, now seen corresponding path program 61 times [2021-05-02 13:30:17,642 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:17,642 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249019470] [2021-05-02 13:30:17,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:17,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:17,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:17,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:17,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:17,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:18,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:18,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:18,491 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:30:18,491 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:18,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249019470] [2021-05-02 13:30:18,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249019470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:18,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112358633] [2021-05-02 13:30:18,491 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:18,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:18,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 13:30:18,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:18,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,920 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:30:18,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112358633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:18,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:18,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 41 [2021-05-02 13:30:18,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055663226] [2021-05-02 13:30:18,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:18,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:18,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:18,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1551, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:18,922 INFO L87 Difference]: Start difference. First operand 618 states and 695 transitions. Second operand has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:23,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:23,229 INFO L93 Difference]: Finished difference Result 718 states and 808 transitions. [2021-05-02 13:30:23,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:30:23,230 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-05-02 13:30:23,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:23,233 INFO L225 Difference]: With dead ends: 718 [2021-05-02 13:30:23,234 INFO L226 Difference]: Without dead ends: 712 [2021-05-02 13:30:23,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 2406.9ms TimeCoverageRelationStatistics Valid=253, Invalid=5149, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:30:23,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 712 states. [2021-05-02 13:30:23,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 712 to 634. [2021-05-02 13:30:23,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 634 states, 550 states have (on average 1.1454545454545455) internal successors, (630), 600 states have internal predecessors, (630), 30 states have call successors, (30), 5 states have call predecessors, (30), 53 states have return successors, (54), 28 states have call predecessors, (54), 28 states have call successors, (54) [2021-05-02 13:30:23,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 634 states to 634 states and 714 transitions. [2021-05-02 13:30:23,317 INFO L78 Accepts]: Start accepts. Automaton has 634 states and 714 transitions. Word has length 53 [2021-05-02 13:30:23,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:23,317 INFO L480 AbstractCegarLoop]: Abstraction has 634 states and 714 transitions. [2021-05-02 13:30:23,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:23,318 INFO L276 IsEmpty]: Start isEmpty. Operand 634 states and 714 transitions. [2021-05-02 13:30:23,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:30:23,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:23,322 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:23,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:23,530 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:23,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:23,530 INFO L82 PathProgramCache]: Analyzing trace with hash -839303187, now seen corresponding path program 62 times [2021-05-02 13:30:23,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:23,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780277244] [2021-05-02 13:30:23,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:23,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:23,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:23,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:23,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:23,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:23,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:23,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:24,217 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:30:24,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:24,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780277244] [2021-05-02 13:30:24,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780277244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:24,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739807833] [2021-05-02 13:30:24,217 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:24,269 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:30:24,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:24,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:30:24,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:24,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:24,800 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:30:24,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739807833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:24,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:24,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 41 [2021-05-02 13:30:24,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108126035] [2021-05-02 13:30:24,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:24,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:24,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:24,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1547, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:24,801 INFO L87 Difference]: Start difference. First operand 634 states and 714 transitions. Second operand has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:28,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:28,700 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2021-05-02 13:30:28,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:30:28,701 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-05-02 13:30:28,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:28,703 INFO L225 Difference]: With dead ends: 640 [2021-05-02 13:30:28,703 INFO L226 Difference]: Without dead ends: 618 [2021-05-02 13:30:28,706 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 2358.6ms TimeCoverageRelationStatistics Valid=255, Invalid=4857, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:30:28,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2021-05-02 13:30:28,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 618. [2021-05-02 13:30:28,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 618 states, 537 states have (on average 1.1452513966480447) internal successors, (615), 585 states have internal predecessors, (615), 29 states have call successors, (29), 5 states have call predecessors, (29), 51 states have return successors, (52), 27 states have call predecessors, (52), 27 states have call successors, (52) [2021-05-02 13:30:28,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 618 states to 618 states and 696 transitions. [2021-05-02 13:30:28,809 INFO L78 Accepts]: Start accepts. Automaton has 618 states and 696 transitions. Word has length 53 [2021-05-02 13:30:28,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:28,809 INFO L480 AbstractCegarLoop]: Abstraction has 618 states and 696 transitions. [2021-05-02 13:30:28,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:28,809 INFO L276 IsEmpty]: Start isEmpty. Operand 618 states and 696 transitions. [2021-05-02 13:30:28,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:30:28,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:28,823 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:29,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2021-05-02 13:30:29,024 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:29,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:29,025 INFO L82 PathProgramCache]: Analyzing trace with hash 886283437, now seen corresponding path program 63 times [2021-05-02 13:30:29,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:29,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4663657] [2021-05-02 13:30:29,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:29,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:29,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:29,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:29,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:29,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:29,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:29,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:29,647 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:30:29,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:29,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4663657] [2021-05-02 13:30:29,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4663657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:29,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021855364] [2021-05-02 13:30:29,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:29,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:30:29,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:29,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:30:29,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:29,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:29,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:30,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:30,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:30,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:30,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:30,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:30,279 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:30:30,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021855364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:30,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:30,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 41 [2021-05-02 13:30:30,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593699424] [2021-05-02 13:30:30,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:30,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:30,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:30,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1543, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:30,280 INFO L87 Difference]: Start difference. First operand 618 states and 696 transitions. Second operand has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:33,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:33,415 INFO L93 Difference]: Finished difference Result 624 states and 701 transitions. [2021-05-02 13:30:33,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:30:33,416 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-05-02 13:30:33,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:33,419 INFO L225 Difference]: With dead ends: 624 [2021-05-02 13:30:33,419 INFO L226 Difference]: Without dead ends: 600 [2021-05-02 13:30:33,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 2237.5ms TimeCoverageRelationStatistics Valid=257, Invalid=4573, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:30:33,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2021-05-02 13:30:33,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 600. [2021-05-02 13:30:33,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 522 states have (on average 1.1455938697318007) internal successors, (598), 568 states have internal predecessors, (598), 28 states have call successors, (28), 5 states have call predecessors, (28), 49 states have return successors, (50), 26 states have call predecessors, (50), 26 states have call successors, (50) [2021-05-02 13:30:33,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 676 transitions. [2021-05-02 13:30:33,512 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 676 transitions. Word has length 53 [2021-05-02 13:30:33,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:33,512 INFO L480 AbstractCegarLoop]: Abstraction has 600 states and 676 transitions. [2021-05-02 13:30:33,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:33,512 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 676 transitions. [2021-05-02 13:30:33,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:30:33,514 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:33,514 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:33,715 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:33,715 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:33,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:33,715 INFO L82 PathProgramCache]: Analyzing trace with hash -537493523, now seen corresponding path program 64 times [2021-05-02 13:30:33,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:33,716 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202978815] [2021-05-02 13:30:33,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:33,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:33,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:33,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:33,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:33,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:33,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:33,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:34,364 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:30:34,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:34,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202978815] [2021-05-02 13:30:34,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202978815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:34,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585243368] [2021-05-02 13:30:34,365 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:34,442 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:30:34,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:34,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 13:30:34,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:34,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:34,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:35,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:35,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:35,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:35,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:35,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:35,132 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:30:35,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585243368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:35,132 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:35,132 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 41 [2021-05-02 13:30:35,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559235422] [2021-05-02 13:30:35,133 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:35,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:35,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:35,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1539, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:35,133 INFO L87 Difference]: Start difference. First operand 600 states and 676 transitions. Second operand has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:37,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:37,480 INFO L93 Difference]: Finished difference Result 606 states and 681 transitions. [2021-05-02 13:30:37,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:30:37,481 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-05-02 13:30:37,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:37,483 INFO L225 Difference]: With dead ends: 606 [2021-05-02 13:30:37,483 INFO L226 Difference]: Without dead ends: 580 [2021-05-02 13:30:37,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 2168.4ms TimeCoverageRelationStatistics Valid=259, Invalid=4297, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:30:37,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-02 13:30:37,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-05-02 13:30:37,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 505 states have (on average 1.1465346534653464) internal successors, (579), 549 states have internal predecessors, (579), 27 states have call successors, (27), 5 states have call predecessors, (27), 47 states have return successors, (48), 25 states have call predecessors, (48), 25 states have call successors, (48) [2021-05-02 13:30:37,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 654 transitions. [2021-05-02 13:30:37,562 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 654 transitions. Word has length 53 [2021-05-02 13:30:37,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:37,562 INFO L480 AbstractCegarLoop]: Abstraction has 580 states and 654 transitions. [2021-05-02 13:30:37,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:37,562 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 654 transitions. [2021-05-02 13:30:37,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:30:37,564 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:37,564 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:37,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:37,765 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:37,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:37,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1906924717, now seen corresponding path program 65 times [2021-05-02 13:30:37,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:37,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780535914] [2021-05-02 13:30:37,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:37,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:37,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:37,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:37,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:37,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:38,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:38,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:38,266 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:30:38,267 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:38,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780535914] [2021-05-02 13:30:38,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780535914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:38,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027707749] [2021-05-02 13:30:38,267 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:38,329 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:30:38,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:38,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:30:38,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:38,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:39,054 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:30:39,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027707749] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:39,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:39,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 41 [2021-05-02 13:30:39,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467457878] [2021-05-02 13:30:39,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:39,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:39,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:39,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1535, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:39,056 INFO L87 Difference]: Start difference. First operand 580 states and 654 transitions. Second operand has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:40,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:40,845 INFO L93 Difference]: Finished difference Result 598 states and 675 transitions. [2021-05-02 13:30:40,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:30:40,846 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-05-02 13:30:40,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:40,850 INFO L225 Difference]: With dead ends: 598 [2021-05-02 13:30:40,850 INFO L226 Difference]: Without dead ends: 592 [2021-05-02 13:30:40,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 2038.9ms TimeCoverageRelationStatistics Valid=261, Invalid=4029, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:30:40,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-02 13:30:40,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 590. [2021-05-02 13:30:40,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 590 states, 512 states have (on average 1.1484375) internal successors, (588), 558 states have internal predecessors, (588), 28 states have call successors, (28), 5 states have call predecessors, (28), 49 states have return successors, (51), 26 states have call predecessors, (51), 26 states have call successors, (51) [2021-05-02 13:30:40,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 590 states to 590 states and 667 transitions. [2021-05-02 13:30:40,956 INFO L78 Accepts]: Start accepts. Automaton has 590 states and 667 transitions. Word has length 53 [2021-05-02 13:30:40,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:40,956 INFO L480 AbstractCegarLoop]: Abstraction has 590 states and 667 transitions. [2021-05-02 13:30:40,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 38 states have (on average 1.394736842105263) internal successors, (53), 35 states have internal predecessors, (53), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:40,956 INFO L276 IsEmpty]: Start isEmpty. Operand 590 states and 667 transitions. [2021-05-02 13:30:40,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:30:40,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:40,958 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:41,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2021-05-02 13:30:41,159 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:41,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:41,159 INFO L82 PathProgramCache]: Analyzing trace with hash -317468980, now seen corresponding path program 66 times [2021-05-02 13:30:41,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:41,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521798138] [2021-05-02 13:30:41,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:41,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:41,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:41,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:41,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:41,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:41,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:41,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:41,757 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:41,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:41,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521798138] [2021-05-02 13:30:41,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521798138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:41,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364951046] [2021-05-02 13:30:41,760 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:41,816 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-05-02 13:30:41,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:41,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:30:41,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:41,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:41,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:42,851 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:42,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364951046] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:42,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:42,852 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 25] total 47 [2021-05-02 13:30:42,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037289728] [2021-05-02 13:30:42,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:30:42,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:42,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:30:42,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=2050, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:30:42,853 INFO L87 Difference]: Start difference. First operand 590 states and 667 transitions. Second operand has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 46 states have internal predecessors, (74), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:47,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:47,623 INFO L93 Difference]: Finished difference Result 682 states and 776 transitions. [2021-05-02 13:30:47,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:30:47,623 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 46 states have internal predecessors, (74), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 54 [2021-05-02 13:30:47,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:47,628 INFO L225 Difference]: With dead ends: 682 [2021-05-02 13:30:47,628 INFO L226 Difference]: Without dead ends: 668 [2021-05-02 13:30:47,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 2678.4ms TimeCoverageRelationStatistics Valid=235, Invalid=4735, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 13:30:47,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-05-02 13:30:47,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 659. [2021-05-02 13:30:47,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 659 states, 572 states have (on average 1.1468531468531469) internal successors, (656), 624 states have internal predecessors, (656), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (60), 29 states have call predecessors, (60), 29 states have call successors, (60) [2021-05-02 13:30:47,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 659 states to 659 states and 747 transitions. [2021-05-02 13:30:47,726 INFO L78 Accepts]: Start accepts. Automaton has 659 states and 747 transitions. Word has length 54 [2021-05-02 13:30:47,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:47,726 INFO L480 AbstractCegarLoop]: Abstraction has 659 states and 747 transitions. [2021-05-02 13:30:47,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 46 states have internal predecessors, (74), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:47,726 INFO L276 IsEmpty]: Start isEmpty. Operand 659 states and 747 transitions. [2021-05-02 13:30:47,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:30:47,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:47,729 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:47,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2021-05-02 13:30:47,929 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:47,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:47,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1122563567, now seen corresponding path program 67 times [2021-05-02 13:30:47,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:47,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415082645] [2021-05-02 13:30:47,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:47,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:47,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:47,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:47,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:47,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:48,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:30:48,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:48,501 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:48,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:48,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415082645] [2021-05-02 13:30:48,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415082645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:48,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995484031] [2021-05-02 13:30:48,502 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:48,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:48,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:30:48,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:48,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:48,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:49,613 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:30:49,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995484031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:49,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:49,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 25] total 47 [2021-05-02 13:30:49,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508064441] [2021-05-02 13:30:49,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:30:49,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:49,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:30:49,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=2050, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:30:49,615 INFO L87 Difference]: Start difference. First operand 659 states and 747 transitions. Second operand has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 46 states have internal predecessors, (74), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:54,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:54,246 INFO L93 Difference]: Finished difference Result 674 states and 762 transitions. [2021-05-02 13:30:54,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:30:54,247 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 46 states have internal predecessors, (74), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 54 [2021-05-02 13:30:54,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:54,249 INFO L225 Difference]: With dead ends: 674 [2021-05-02 13:30:54,249 INFO L226 Difference]: Without dead ends: 662 [2021-05-02 13:30:54,251 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 2684.3ms TimeCoverageRelationStatistics Valid=235, Invalid=4735, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 13:30:54,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-05-02 13:30:54,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 660. [2021-05-02 13:30:54,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 660 states, 573 states have (on average 1.1465968586387434) internal successors, (657), 625 states have internal predecessors, (657), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (56), 29 states have call predecessors, (56), 29 states have call successors, (56) [2021-05-02 13:30:54,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 660 states to 660 states and 744 transitions. [2021-05-02 13:30:54,374 INFO L78 Accepts]: Start accepts. Automaton has 660 states and 744 transitions. Word has length 54 [2021-05-02 13:30:54,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:54,375 INFO L480 AbstractCegarLoop]: Abstraction has 660 states and 744 transitions. [2021-05-02 13:30:54,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.574468085106383) internal successors, (74), 46 states have internal predecessors, (74), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:30:54,375 INFO L276 IsEmpty]: Start isEmpty. Operand 660 states and 744 transitions. [2021-05-02 13:30:54,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:30:54,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:54,379 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:54,596 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:54,597 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:54,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:54,597 INFO L82 PathProgramCache]: Analyzing trace with hash 334260941, now seen corresponding path program 68 times [2021-05-02 13:30:54,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:54,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387567073] [2021-05-02 13:30:54,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:54,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:54,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:54,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:54,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:54,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:54,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:30:54,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:54,767 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:54,767 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:54,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387567073] [2021-05-02 13:30:54,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387567073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:54,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996356394] [2021-05-02 13:30:54,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:54,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:30:54,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:54,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:30:54,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:54,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:54,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:55,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:55,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:55,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:55,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:55,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:55,050 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:55,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996356394] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:55,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:55,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 21 [2021-05-02 13:30:55,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402645040] [2021-05-02 13:30:55,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:30:55,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:55,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:30:55,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:30:55,052 INFO L87 Difference]: Start difference. First operand 660 states and 744 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:30:56,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:56,490 INFO L93 Difference]: Finished difference Result 818 states and 933 transitions. [2021-05-02 13:30:56,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:30:56,491 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 54 [2021-05-02 13:30:56,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:56,495 INFO L225 Difference]: With dead ends: 818 [2021-05-02 13:30:56,495 INFO L226 Difference]: Without dead ends: 772 [2021-05-02 13:30:56,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1264.9ms TimeCoverageRelationStatistics Valid=579, Invalid=1677, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:30:56,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-05-02 13:30:56,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 742. [2021-05-02 13:30:56,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 742 states, 655 states have (on average 1.1450381679389312) internal successors, (750), 707 states have internal predecessors, (750), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (56), 29 states have call predecessors, (56), 29 states have call successors, (56) [2021-05-02 13:30:56,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 742 states to 742 states and 837 transitions. [2021-05-02 13:30:56,631 INFO L78 Accepts]: Start accepts. Automaton has 742 states and 837 transitions. Word has length 54 [2021-05-02 13:30:56,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:56,631 INFO L480 AbstractCegarLoop]: Abstraction has 742 states and 837 transitions. [2021-05-02 13:30:56,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:30:56,631 INFO L276 IsEmpty]: Start isEmpty. Operand 742 states and 837 transitions. [2021-05-02 13:30:56,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:30:56,634 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:56,634 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:56,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable127 [2021-05-02 13:30:56,837 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:56,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:56,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1144517490, now seen corresponding path program 69 times [2021-05-02 13:30:56,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:56,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018031296] [2021-05-02 13:30:56,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:56,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:56,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:56,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:56,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:56,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:56,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:30:56,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:56,976 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:56,976 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:56,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018031296] [2021-05-02 13:30:56,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018031296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:56,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005394741] [2021-05-02 13:30:56,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:57,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:30:57,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:57,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:30:57,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:57,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:57,241 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 13:30:57,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005394741] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:57,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:30:57,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 21 [2021-05-02 13:30:57,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256625269] [2021-05-02 13:30:57,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:30:57,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:57,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:30:57,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:30:57,242 INFO L87 Difference]: Start difference. First operand 742 states and 837 transitions. Second operand has 21 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 20 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:58,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:58,730 INFO L93 Difference]: Finished difference Result 1298 states and 1460 transitions. [2021-05-02 13:30:58,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:30:58,731 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 20 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 54 [2021-05-02 13:30:58,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:58,738 INFO L225 Difference]: With dead ends: 1298 [2021-05-02 13:30:58,738 INFO L226 Difference]: Without dead ends: 854 [2021-05-02 13:30:58,741 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1244.1ms TimeCoverageRelationStatistics Valid=579, Invalid=1677, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:30:58,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 854 states. [2021-05-02 13:30:58,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 854 to 824. [2021-05-02 13:30:58,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 824 states, 737 states have (on average 1.1438263229308006) internal successors, (843), 789 states have internal predecessors, (843), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (56), 29 states have call predecessors, (56), 29 states have call successors, (56) [2021-05-02 13:30:58,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 824 states to 824 states and 930 transitions. [2021-05-02 13:30:58,863 INFO L78 Accepts]: Start accepts. Automaton has 824 states and 930 transitions. Word has length 54 [2021-05-02 13:30:58,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:58,863 INFO L480 AbstractCegarLoop]: Abstraction has 824 states and 930 transitions. [2021-05-02 13:30:58,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 20 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:30:58,863 INFO L276 IsEmpty]: Start isEmpty. Operand 824 states and 930 transitions. [2021-05-02 13:30:58,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:30:58,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:58,867 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:59,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:59,067 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:59,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:59,068 INFO L82 PathProgramCache]: Analyzing trace with hash -579740214, now seen corresponding path program 70 times [2021-05-02 13:30:59,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:59,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425009355] [2021-05-02 13:30:59,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:59,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:59,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:30:59,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:59,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:30:59,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:59,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:30:59,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:59,981 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:30:59,981 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:59,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425009355] [2021-05-02 13:30:59,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425009355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:59,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102394176] [2021-05-02 13:30:59,981 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:00,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:31:00,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:00,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:31:00,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:00,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:00,452 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:31:00,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102394176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:00,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:00,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 43 [2021-05-02 13:31:00,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232392387] [2021-05-02 13:31:00,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:00,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:00,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:00,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1713, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:00,453 INFO L87 Difference]: Start difference. First operand 824 states and 930 transitions. Second operand has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:05,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:05,727 INFO L93 Difference]: Finished difference Result 940 states and 1061 transitions. [2021-05-02 13:31:05,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:31:05,728 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 55 [2021-05-02 13:31:05,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:05,732 INFO L225 Difference]: With dead ends: 940 [2021-05-02 13:31:05,732 INFO L226 Difference]: Without dead ends: 934 [2021-05-02 13:31:05,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 2733.1ms TimeCoverageRelationStatistics Valid=265, Invalid=5741, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:31:05,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 934 states. [2021-05-02 13:31:05,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 934 to 840. [2021-05-02 13:31:05,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 840 states, 750 states have (on average 1.144) internal successors, (858), 804 states have internal predecessors, (858), 32 states have call successors, (32), 5 states have call predecessors, (32), 57 states have return successors, (59), 30 states have call predecessors, (59), 30 states have call successors, (59) [2021-05-02 13:31:05,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 840 states to 840 states and 949 transitions. [2021-05-02 13:31:05,857 INFO L78 Accepts]: Start accepts. Automaton has 840 states and 949 transitions. Word has length 55 [2021-05-02 13:31:05,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:05,857 INFO L480 AbstractCegarLoop]: Abstraction has 840 states and 949 transitions. [2021-05-02 13:31:05,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:05,857 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states and 949 transitions. [2021-05-02 13:31:05,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:31:05,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:05,861 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:06,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2021-05-02 13:31:06,062 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:06,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:06,062 INFO L82 PathProgramCache]: Analyzing trace with hash -2028236118, now seen corresponding path program 71 times [2021-05-02 13:31:06,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:06,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085504782] [2021-05-02 13:31:06,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:06,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:06,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:06,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:06,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:06,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:06,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:31:06,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:06,901 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:31:06,902 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:06,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085504782] [2021-05-02 13:31:06,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085504782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:06,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511819301] [2021-05-02 13:31:06,902 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:06,957 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:31:06,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:06,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 13:31:06,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:07,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:07,550 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:31:07,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511819301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:07,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:07,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 43 [2021-05-02 13:31:07,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036139151] [2021-05-02 13:31:07,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:07,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:07,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:07,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1709, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:07,551 INFO L87 Difference]: Start difference. First operand 840 states and 949 transitions. Second operand has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:11,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:11,955 INFO L93 Difference]: Finished difference Result 846 states and 954 transitions. [2021-05-02 13:31:11,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:31:11,956 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 55 [2021-05-02 13:31:11,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:11,958 INFO L225 Difference]: With dead ends: 846 [2021-05-02 13:31:11,958 INFO L226 Difference]: Without dead ends: 824 [2021-05-02 13:31:11,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 2688.1ms TimeCoverageRelationStatistics Valid=267, Invalid=5433, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:31:11,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 824 states. [2021-05-02 13:31:12,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 824 to 824. [2021-05-02 13:31:12,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 824 states, 737 states have (on average 1.1438263229308006) internal successors, (843), 789 states have internal predecessors, (843), 31 states have call successors, (31), 5 states have call predecessors, (31), 55 states have return successors, (57), 29 states have call predecessors, (57), 29 states have call successors, (57) [2021-05-02 13:31:12,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 824 states to 824 states and 931 transitions. [2021-05-02 13:31:12,128 INFO L78 Accepts]: Start accepts. Automaton has 824 states and 931 transitions. Word has length 55 [2021-05-02 13:31:12,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:12,128 INFO L480 AbstractCegarLoop]: Abstraction has 824 states and 931 transitions. [2021-05-02 13:31:12,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:12,128 INFO L276 IsEmpty]: Start isEmpty. Operand 824 states and 931 transitions. [2021-05-02 13:31:12,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:31:12,134 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:12,134 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:12,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:12,349 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:12,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:12,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1858987446, now seen corresponding path program 72 times [2021-05-02 13:31:12,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:12,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095726577] [2021-05-02 13:31:12,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:12,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:12,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:12,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:12,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:12,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:12,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:31:12,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:13,105 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:31:13,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:13,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095726577] [2021-05-02 13:31:13,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095726577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:13,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053794176] [2021-05-02 13:31:13,106 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:13,172 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:31:13,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:13,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:31:13,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:13,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:13,824 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:31:13,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053794176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:13,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:13,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 43 [2021-05-02 13:31:13,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122473023] [2021-05-02 13:31:13,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:13,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:13,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:13,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1705, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:13,826 INFO L87 Difference]: Start difference. First operand 824 states and 931 transitions. Second operand has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:17,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:17,580 INFO L93 Difference]: Finished difference Result 830 states and 936 transitions. [2021-05-02 13:31:17,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:31:17,581 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 55 [2021-05-02 13:31:17,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:17,584 INFO L225 Difference]: With dead ends: 830 [2021-05-02 13:31:17,584 INFO L226 Difference]: Without dead ends: 806 [2021-05-02 13:31:17,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 2559.4ms TimeCoverageRelationStatistics Valid=269, Invalid=5133, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:31:17,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 806 states. [2021-05-02 13:31:17,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 806 to 806. [2021-05-02 13:31:17,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 806 states, 722 states have (on average 1.1440443213296398) internal successors, (826), 772 states have internal predecessors, (826), 30 states have call successors, (30), 5 states have call predecessors, (30), 53 states have return successors, (55), 28 states have call predecessors, (55), 28 states have call successors, (55) [2021-05-02 13:31:17,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 806 states to 806 states and 911 transitions. [2021-05-02 13:31:17,703 INFO L78 Accepts]: Start accepts. Automaton has 806 states and 911 transitions. Word has length 55 [2021-05-02 13:31:17,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:17,703 INFO L480 AbstractCegarLoop]: Abstraction has 806 states and 911 transitions. [2021-05-02 13:31:17,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:17,703 INFO L276 IsEmpty]: Start isEmpty. Operand 806 states and 911 transitions. [2021-05-02 13:31:17,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:31:17,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:17,706 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:17,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2021-05-02 13:31:17,907 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:17,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:17,907 INFO L82 PathProgramCache]: Analyzing trace with hash 2070730282, now seen corresponding path program 73 times [2021-05-02 13:31:17,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:17,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902840925] [2021-05-02 13:31:17,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:17,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:17,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:17,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:17,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:17,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:18,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:31:18,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:18,634 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:31:18,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:18,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902840925] [2021-05-02 13:31:18,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902840925] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:18,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652566152] [2021-05-02 13:31:18,634 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:18,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:18,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:31:18,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:18,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:19,461 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:31:19,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652566152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:19,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:19,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 43 [2021-05-02 13:31:19,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823097272] [2021-05-02 13:31:19,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:19,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:19,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:19,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1701, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:19,462 INFO L87 Difference]: Start difference. First operand 806 states and 911 transitions. Second operand has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:22,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:22,514 INFO L93 Difference]: Finished difference Result 812 states and 916 transitions. [2021-05-02 13:31:22,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:31:22,515 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 55 [2021-05-02 13:31:22,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:22,518 INFO L225 Difference]: With dead ends: 812 [2021-05-02 13:31:22,518 INFO L226 Difference]: Without dead ends: 786 [2021-05-02 13:31:22,521 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 2534.7ms TimeCoverageRelationStatistics Valid=271, Invalid=4841, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:31:22,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 786 states. [2021-05-02 13:31:22,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 786 to 786. [2021-05-02 13:31:22,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 786 states, 705 states have (on average 1.1446808510638298) internal successors, (807), 753 states have internal predecessors, (807), 29 states have call successors, (29), 5 states have call predecessors, (29), 51 states have return successors, (53), 27 states have call predecessors, (53), 27 states have call successors, (53) [2021-05-02 13:31:22,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 786 states to 786 states and 889 transitions. [2021-05-02 13:31:22,636 INFO L78 Accepts]: Start accepts. Automaton has 786 states and 889 transitions. Word has length 55 [2021-05-02 13:31:22,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:22,636 INFO L480 AbstractCegarLoop]: Abstraction has 786 states and 889 transitions. [2021-05-02 13:31:22,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:22,636 INFO L276 IsEmpty]: Start isEmpty. Operand 786 states and 889 transitions. [2021-05-02 13:31:22,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:31:22,640 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:22,640 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:22,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:22,840 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:22,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:22,841 INFO L82 PathProgramCache]: Analyzing trace with hash -827352577, now seen corresponding path program 74 times [2021-05-02 13:31:22,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:22,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923893100] [2021-05-02 13:31:22,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:22,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:22,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:22,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:22,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:22,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:22,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:31:23,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:23,209 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:31:23,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:23,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923893100] [2021-05-02 13:31:23,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [923893100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:23,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922186416] [2021-05-02 13:31:23,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:23,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:31:23,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:23,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:31:23,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:23,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:23,849 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-02 13:31:23,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922186416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:23,849 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:23,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17] total 33 [2021-05-02 13:31:23,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330481114] [2021-05-02 13:31:23,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:31:23,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:23,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:31:23,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=977, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:31:23,850 INFO L87 Difference]: Start difference. First operand 786 states and 889 transitions. Second operand has 33 states, 33 states have (on average 1.696969696969697) internal successors, (56), 32 states have internal predecessors, (56), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:26,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:26,159 INFO L93 Difference]: Finished difference Result 874 states and 995 transitions. [2021-05-02 13:31:26,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:31:26,160 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.696969696969697) internal successors, (56), 32 states have internal predecessors, (56), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2021-05-02 13:31:26,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:26,168 INFO L225 Difference]: With dead ends: 874 [2021-05-02 13:31:26,169 INFO L226 Difference]: Without dead ends: 856 [2021-05-02 13:31:26,173 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 1485.9ms TimeCoverageRelationStatistics Valid=167, Invalid=2185, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:31:26,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 856 states. [2021-05-02 13:31:26,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 856 to 851. [2021-05-02 13:31:26,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 851 states, 743 states have (on average 1.135935397039031) internal successors, (844), 809 states have internal predecessors, (844), 38 states have call successors, (38), 5 states have call predecessors, (38), 69 states have return successors, (80), 36 states have call predecessors, (80), 36 states have call successors, (80) [2021-05-02 13:31:26,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 851 states to 851 states and 962 transitions. [2021-05-02 13:31:26,330 INFO L78 Accepts]: Start accepts. Automaton has 851 states and 962 transitions. Word has length 55 [2021-05-02 13:31:26,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:26,330 INFO L480 AbstractCegarLoop]: Abstraction has 851 states and 962 transitions. [2021-05-02 13:31:26,330 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.696969696969697) internal successors, (56), 32 states have internal predecessors, (56), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:26,330 INFO L276 IsEmpty]: Start isEmpty. Operand 851 states and 962 transitions. [2021-05-02 13:31:26,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:31:26,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:26,334 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:26,535 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141,75 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:26,535 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:26,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:26,535 INFO L82 PathProgramCache]: Analyzing trace with hash -704555318, now seen corresponding path program 75 times [2021-05-02 13:31:26,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:26,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327223139] [2021-05-02 13:31:26,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:26,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:26,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:26,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:26,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:26,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:26,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:31:26,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:27,176 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:31:27,176 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:27,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327223139] [2021-05-02 13:31:27,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327223139] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:27,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773480038] [2021-05-02 13:31:27,176 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:27,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:31:27,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:27,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 13:31:27,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:27,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:28,047 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:31:28,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773480038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:28,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:28,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 43 [2021-05-02 13:31:28,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554661528] [2021-05-02 13:31:28,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:28,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:28,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:28,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1697, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:28,048 INFO L87 Difference]: Start difference. First operand 851 states and 962 transitions. Second operand has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:30,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:30,452 INFO L93 Difference]: Finished difference Result 869 states and 984 transitions. [2021-05-02 13:31:30,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:31:30,453 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 55 [2021-05-02 13:31:30,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:30,459 INFO L225 Difference]: With dead ends: 869 [2021-05-02 13:31:30,459 INFO L226 Difference]: Without dead ends: 851 [2021-05-02 13:31:30,463 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 2398.3ms TimeCoverageRelationStatistics Valid=273, Invalid=4557, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:31:30,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 851 states. [2021-05-02 13:31:30,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 851 to 846. [2021-05-02 13:31:30,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 738 states have (on average 1.1382113821138211) internal successors, (840), 804 states have internal predecessors, (840), 38 states have call successors, (38), 5 states have call predecessors, (38), 69 states have return successors, (80), 36 states have call predecessors, (80), 36 states have call successors, (80) [2021-05-02 13:31:30,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 958 transitions. [2021-05-02 13:31:30,613 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 958 transitions. Word has length 55 [2021-05-02 13:31:30,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:30,613 INFO L480 AbstractCegarLoop]: Abstraction has 846 states and 958 transitions. [2021-05-02 13:31:30,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 40 states have (on average 1.375) internal successors, (55), 37 states have internal predecessors, (55), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:30,614 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 958 transitions. [2021-05-02 13:31:30,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:31:30,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:30,618 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:30,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:30,822 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:30,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:30,822 INFO L82 PathProgramCache]: Analyzing trace with hash -77183301, now seen corresponding path program 76 times [2021-05-02 13:31:30,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:30,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885669600] [2021-05-02 13:31:30,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:30,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:30,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:30,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:30,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:30,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:30,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:31:30,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:31,180 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:31:31,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:31,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885669600] [2021-05-02 13:31:31,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885669600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:31,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687830938] [2021-05-02 13:31:31,180 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:31,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:31:31,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:31,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:31:31,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:31,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:31,871 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-02 13:31:31,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687830938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:31,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:31,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17] total 33 [2021-05-02 13:31:31,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096754220] [2021-05-02 13:31:31,872 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:31:31,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:31,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:31:31,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=977, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:31:31,872 INFO L87 Difference]: Start difference. First operand 846 states and 958 transitions. Second operand has 33 states, 33 states have (on average 1.696969696969697) internal successors, (56), 32 states have internal predecessors, (56), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:34,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:34,111 INFO L93 Difference]: Finished difference Result 860 states and 971 transitions. [2021-05-02 13:31:34,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:31:34,113 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.696969696969697) internal successors, (56), 32 states have internal predecessors, (56), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2021-05-02 13:31:34,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:34,116 INFO L225 Difference]: With dead ends: 860 [2021-05-02 13:31:34,116 INFO L226 Difference]: Without dead ends: 834 [2021-05-02 13:31:34,119 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1555.8ms TimeCoverageRelationStatistics Valid=167, Invalid=2185, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:31:34,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 834 states. [2021-05-02 13:31:34,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 834 to 832. [2021-05-02 13:31:34,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 832 states, 724 states have (on average 1.138121546961326) internal successors, (824), 790 states have internal predecessors, (824), 38 states have call successors, (38), 5 states have call predecessors, (38), 69 states have return successors, (72), 36 states have call predecessors, (72), 36 states have call successors, (72) [2021-05-02 13:31:34,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 832 states to 832 states and 934 transitions. [2021-05-02 13:31:34,235 INFO L78 Accepts]: Start accepts. Automaton has 832 states and 934 transitions. Word has length 55 [2021-05-02 13:31:34,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:34,236 INFO L480 AbstractCegarLoop]: Abstraction has 832 states and 934 transitions. [2021-05-02 13:31:34,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.696969696969697) internal successors, (56), 32 states have internal predecessors, (56), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:34,236 INFO L276 IsEmpty]: Start isEmpty. Operand 832 states and 934 transitions. [2021-05-02 13:31:34,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:31:34,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:34,242 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:34,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable145 [2021-05-02 13:31:34,465 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:34,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:34,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1811549873, now seen corresponding path program 77 times [2021-05-02 13:31:34,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:34,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830663481] [2021-05-02 13:31:34,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:34,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:34,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:34,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:34,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:34,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:34,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:31:34,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:35,141 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:31:35,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:35,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830663481] [2021-05-02 13:31:35,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830663481] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:35,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133492162] [2021-05-02 13:31:35,142 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:35,196 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 13:31:35,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:35,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:31:35,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:35,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:35,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:36,494 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:31:36,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133492162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:36,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:36,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27] total 51 [2021-05-02 13:31:36,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607175091] [2021-05-02 13:31:36,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:31:36,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:36,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:31:36,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2428, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:31:36,495 INFO L87 Difference]: Start difference. First operand 832 states and 934 transitions. Second operand has 51 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 50 states have internal predecessors, (78), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:43,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:43,432 INFO L93 Difference]: Finished difference Result 948 states and 1071 transitions. [2021-05-02 13:31:43,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:31:43,433 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 50 states have internal predecessors, (78), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 56 [2021-05-02 13:31:43,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:43,439 INFO L225 Difference]: With dead ends: 948 [2021-05-02 13:31:43,440 INFO L226 Difference]: Without dead ends: 934 [2021-05-02 13:31:43,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 3351.9ms TimeCoverageRelationStatistics Valid=255, Invalid=5597, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 13:31:43,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 934 states. [2021-05-02 13:31:43,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 934 to 925. [2021-05-02 13:31:43,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 925 states, 805 states have (on average 1.1366459627329193) internal successors, (915), 879 states have internal predecessors, (915), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (84), 40 states have call predecessors, (84), 40 states have call successors, (84) [2021-05-02 13:31:43,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 925 states to 925 states and 1041 transitions. [2021-05-02 13:31:43,598 INFO L78 Accepts]: Start accepts. Automaton has 925 states and 1041 transitions. Word has length 56 [2021-05-02 13:31:43,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:43,599 INFO L480 AbstractCegarLoop]: Abstraction has 925 states and 1041 transitions. [2021-05-02 13:31:43,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 50 states have internal predecessors, (78), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:43,599 INFO L276 IsEmpty]: Start isEmpty. Operand 925 states and 1041 transitions. [2021-05-02 13:31:43,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:31:43,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:43,603 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:43,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable146 [2021-05-02 13:31:43,804 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:43,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:43,804 INFO L82 PathProgramCache]: Analyzing trace with hash -120213876, now seen corresponding path program 78 times [2021-05-02 13:31:43,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:43,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178922887] [2021-05-02 13:31:43,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:43,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:43,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:43,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:43,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:43,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:44,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:31:44,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:44,487 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:31:44,487 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:44,487 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178922887] [2021-05-02 13:31:44,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178922887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:44,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580729818] [2021-05-02 13:31:44,488 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:44,545 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 13:31:44,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:44,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:31:44,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:44,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:44,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:45,995 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:31:45,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580729818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:45,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:45,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27] total 51 [2021-05-02 13:31:45,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958977188] [2021-05-02 13:31:45,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:31:45,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:45,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:31:45,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2428, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:31:45,996 INFO L87 Difference]: Start difference. First operand 925 states and 1041 transitions. Second operand has 51 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 50 states have internal predecessors, (78), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:53,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:53,662 INFO L93 Difference]: Finished difference Result 940 states and 1056 transitions. [2021-05-02 13:31:53,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:31:53,664 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 50 states have internal predecessors, (78), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 56 [2021-05-02 13:31:53,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:53,667 INFO L225 Difference]: With dead ends: 940 [2021-05-02 13:31:53,667 INFO L226 Difference]: Without dead ends: 928 [2021-05-02 13:31:53,670 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 3550.8ms TimeCoverageRelationStatistics Valid=255, Invalid=5597, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 13:31:53,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 928 states. [2021-05-02 13:31:53,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 928 to 926. [2021-05-02 13:31:53,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 926 states, 806 states have (on average 1.1364764267990075) internal successors, (916), 880 states have internal predecessors, (916), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (79), 40 states have call predecessors, (79), 40 states have call successors, (79) [2021-05-02 13:31:53,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 1037 transitions. [2021-05-02 13:31:53,806 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 1037 transitions. Word has length 56 [2021-05-02 13:31:53,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:53,806 INFO L480 AbstractCegarLoop]: Abstraction has 926 states and 1037 transitions. [2021-05-02 13:31:53,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 50 states have internal predecessors, (78), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:31:53,806 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 1037 transitions. [2021-05-02 13:31:53,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:31:53,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:53,811 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:54,011 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable147 [2021-05-02 13:31:54,011 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:54,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:54,012 INFO L82 PathProgramCache]: Analyzing trace with hash -2099731086, now seen corresponding path program 79 times [2021-05-02 13:31:54,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:54,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239030290] [2021-05-02 13:31:54,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:54,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:54,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:54,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:54,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:54,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:54,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:31:54,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:54,193 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:31:54,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:54,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239030290] [2021-05-02 13:31:54,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239030290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:54,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374760158] [2021-05-02 13:31:54,194 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:54,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:54,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:31:54,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:54,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:54,496 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:31:54,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374760158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:54,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:54,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 22 [2021-05-02 13:31:54,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826683102] [2021-05-02 13:31:54,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:31:54,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:54,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:31:54,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=307, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:31:54,497 INFO L87 Difference]: Start difference. First operand 926 states and 1037 transitions. Second operand has 22 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 21 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:56,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:56,062 INFO L93 Difference]: Finished difference Result 1404 states and 1549 transitions. [2021-05-02 13:31:56,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:31:56,063 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 21 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 56 [2021-05-02 13:31:56,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:56,070 INFO L225 Difference]: With dead ends: 1404 [2021-05-02 13:31:56,070 INFO L226 Difference]: Without dead ends: 925 [2021-05-02 13:31:56,075 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1201.8ms TimeCoverageRelationStatistics Valid=764, Invalid=1686, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:31:56,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 925 states. [2021-05-02 13:31:56,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 925 to 917. [2021-05-02 13:31:56,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 803 states have (on average 1.13200498132005) internal successors, (909), 873 states have internal predecessors, (909), 40 states have call successors, (40), 5 states have call predecessors, (40), 73 states have return successors, (73), 38 states have call predecessors, (73), 38 states have call successors, (73) [2021-05-02 13:31:56,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 1022 transitions. [2021-05-02 13:31:56,213 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 1022 transitions. Word has length 56 [2021-05-02 13:31:56,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:56,213 INFO L480 AbstractCegarLoop]: Abstraction has 917 states and 1022 transitions. [2021-05-02 13:31:56,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 21 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:31:56,214 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 1022 transitions. [2021-05-02 13:31:56,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:31:56,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:56,218 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:56,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:56,418 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:56,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:56,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1863657747, now seen corresponding path program 80 times [2021-05-02 13:31:56,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:56,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165242228] [2021-05-02 13:31:56,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:56,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:56,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:56,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:56,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:56,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:56,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:31:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:56,597 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:31:56,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:56,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165242228] [2021-05-02 13:31:56,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165242228] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:56,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236930500] [2021-05-02 13:31:56,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:56,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:31:56,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:56,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:31:56,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:56,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:56,915 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:31:56,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236930500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:56,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:31:56,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 22 [2021-05-02 13:31:56,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570328582] [2021-05-02 13:31:56,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:31:56,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:56,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:31:56,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=307, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:31:56,917 INFO L87 Difference]: Start difference. First operand 917 states and 1022 transitions. Second operand has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:31:58,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:58,460 INFO L93 Difference]: Finished difference Result 967 states and 1082 transitions. [2021-05-02 13:31:58,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:31:58,461 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 56 [2021-05-02 13:31:58,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:58,465 INFO L225 Difference]: With dead ends: 967 [2021-05-02 13:31:58,465 INFO L226 Difference]: Without dead ends: 928 [2021-05-02 13:31:58,469 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 1247.6ms TimeCoverageRelationStatistics Valid=764, Invalid=1686, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:31:58,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 928 states. [2021-05-02 13:31:58,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 928 to 928. [2021-05-02 13:31:58,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 928 states, 814 states have (on average 1.1302211302211302) internal successors, (920), 884 states have internal predecessors, (920), 40 states have call successors, (40), 5 states have call predecessors, (40), 73 states have return successors, (73), 38 states have call predecessors, (73), 38 states have call successors, (73) [2021-05-02 13:31:58,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 928 states to 928 states and 1033 transitions. [2021-05-02 13:31:58,615 INFO L78 Accepts]: Start accepts. Automaton has 928 states and 1033 transitions. Word has length 56 [2021-05-02 13:31:58,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:58,615 INFO L480 AbstractCegarLoop]: Abstraction has 928 states and 1033 transitions. [2021-05-02 13:31:58,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:31:58,615 INFO L276 IsEmpty]: Start isEmpty. Operand 928 states and 1033 transitions. [2021-05-02 13:31:58,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:31:58,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:58,619 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:58,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable149 [2021-05-02 13:31:58,820 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:58,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:58,820 INFO L82 PathProgramCache]: Analyzing trace with hash -451135283, now seen corresponding path program 81 times [2021-05-02 13:31:58,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:58,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325062245] [2021-05-02 13:31:58,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:58,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:58,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:31:58,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:58,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:31:58,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:59,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:31:59,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:59,972 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:31:59,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:59,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325062245] [2021-05-02 13:31:59,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325062245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:59,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782264786] [2021-05-02 13:31:59,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:00,030 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 13:32:00,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:00,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 13:32:00,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:00,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:00,554 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:32:00,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782264786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:00,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:00,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 45 [2021-05-02 13:32:00,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326431017] [2021-05-02 13:32:00,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:32:00,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:00,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:32:00,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1883, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:32:00,555 INFO L87 Difference]: Start difference. First operand 928 states and 1033 transitions. Second operand has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:07,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:07,845 INFO L93 Difference]: Finished difference Result 1052 states and 1172 transitions. [2021-05-02 13:32:07,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:32:07,846 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:32:07,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:07,852 INFO L225 Difference]: With dead ends: 1052 [2021-05-02 13:32:07,853 INFO L226 Difference]: Without dead ends: 1046 [2021-05-02 13:32:07,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 3452.7ms TimeCoverageRelationStatistics Valid=277, Invalid=6365, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:32:07,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1046 states. [2021-05-02 13:32:08,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1046 to 944. [2021-05-02 13:32:08,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 944 states, 827 states have (on average 1.1305925030229746) internal successors, (935), 899 states have internal predecessors, (935), 41 states have call successors, (41), 5 states have call predecessors, (41), 75 states have return successors, (76), 39 states have call predecessors, (76), 39 states have call successors, (76) [2021-05-02 13:32:08,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 944 states to 944 states and 1052 transitions. [2021-05-02 13:32:08,011 INFO L78 Accepts]: Start accepts. Automaton has 944 states and 1052 transitions. Word has length 57 [2021-05-02 13:32:08,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:08,011 INFO L480 AbstractCegarLoop]: Abstraction has 944 states and 1052 transitions. [2021-05-02 13:32:08,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:08,011 INFO L276 IsEmpty]: Start isEmpty. Operand 944 states and 1052 transitions. [2021-05-02 13:32:08,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:32:08,015 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:08,016 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:08,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:08,216 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:08,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:08,216 INFO L82 PathProgramCache]: Analyzing trace with hash -866207603, now seen corresponding path program 82 times [2021-05-02 13:32:08,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:08,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575792381] [2021-05-02 13:32:08,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:08,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:08,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:08,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:08,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:08,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:08,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:32:08,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:09,359 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:32:09,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:09,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575792381] [2021-05-02 13:32:09,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575792381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:09,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094232233] [2021-05-02 13:32:09,360 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:09,414 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:32:09,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:09,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:32:09,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:09,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:09,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:10,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:10,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:10,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:10,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:10,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:10,164 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:32:10,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094232233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:10,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:10,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 45 [2021-05-02 13:32:10,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901769166] [2021-05-02 13:32:10,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:32:10,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:10,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:32:10,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1879, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:32:10,165 INFO L87 Difference]: Start difference. First operand 944 states and 1052 transitions. Second operand has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:16,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:16,541 INFO L93 Difference]: Finished difference Result 950 states and 1057 transitions. [2021-05-02 13:32:16,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:32:16,543 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:32:16,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:16,546 INFO L225 Difference]: With dead ends: 950 [2021-05-02 13:32:16,546 INFO L226 Difference]: Without dead ends: 928 [2021-05-02 13:32:16,551 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 887 ImplicationChecksByTransitivity, 3507.2ms TimeCoverageRelationStatistics Valid=279, Invalid=6041, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 13:32:16,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 928 states. [2021-05-02 13:32:16,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 928 to 928. [2021-05-02 13:32:16,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 928 states, 814 states have (on average 1.1302211302211302) internal successors, (920), 884 states have internal predecessors, (920), 40 states have call successors, (40), 5 states have call predecessors, (40), 73 states have return successors, (74), 38 states have call predecessors, (74), 38 states have call successors, (74) [2021-05-02 13:32:16,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 928 states to 928 states and 1034 transitions. [2021-05-02 13:32:16,735 INFO L78 Accepts]: Start accepts. Automaton has 928 states and 1034 transitions. Word has length 57 [2021-05-02 13:32:16,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:16,735 INFO L480 AbstractCegarLoop]: Abstraction has 928 states and 1034 transitions. [2021-05-02 13:32:16,735 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:16,735 INFO L276 IsEmpty]: Start isEmpty. Operand 928 states and 1034 transitions. [2021-05-02 13:32:16,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:32:16,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:16,740 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:16,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,83 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:16,940 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:16,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:16,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1830582477, now seen corresponding path program 83 times [2021-05-02 13:32:16,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:16,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929716605] [2021-05-02 13:32:16,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:16,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:17,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:17,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:17,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:17,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:17,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:32:17,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:32:17,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:17,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929716605] [2021-05-02 13:32:17,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929716605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:17,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255822460] [2021-05-02 13:32:17,983 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:18,037 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:32:18,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:18,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 13:32:18,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:18,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:18,907 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:32:18,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255822460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:18,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:18,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 45 [2021-05-02 13:32:18,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48337493] [2021-05-02 13:32:18,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:32:18,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:18,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:32:18,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1875, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:32:18,908 INFO L87 Difference]: Start difference. First operand 928 states and 1034 transitions. Second operand has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:24,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:24,308 INFO L93 Difference]: Finished difference Result 934 states and 1039 transitions. [2021-05-02 13:32:24,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:32:24,310 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:32:24,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:24,314 INFO L225 Difference]: With dead ends: 934 [2021-05-02 13:32:24,314 INFO L226 Difference]: Without dead ends: 910 [2021-05-02 13:32:24,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 887 ImplicationChecksByTransitivity, 3380.2ms TimeCoverageRelationStatistics Valid=281, Invalid=5725, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:32:24,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 910 states. [2021-05-02 13:32:24,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 910 to 910. [2021-05-02 13:32:24,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 910 states, 799 states have (on average 1.130162703379224) internal successors, (903), 867 states have internal predecessors, (903), 39 states have call successors, (39), 5 states have call predecessors, (39), 71 states have return successors, (72), 37 states have call predecessors, (72), 37 states have call successors, (72) [2021-05-02 13:32:24,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 910 states to 910 states and 1014 transitions. [2021-05-02 13:32:24,478 INFO L78 Accepts]: Start accepts. Automaton has 910 states and 1014 transitions. Word has length 57 [2021-05-02 13:32:24,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:24,478 INFO L480 AbstractCegarLoop]: Abstraction has 910 states and 1014 transitions. [2021-05-02 13:32:24,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:24,478 INFO L276 IsEmpty]: Start isEmpty. Operand 910 states and 1014 transitions. [2021-05-02 13:32:24,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:32:24,482 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:24,482 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:24,683 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable156 [2021-05-02 13:32:24,683 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:24,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:24,683 INFO L82 PathProgramCache]: Analyzing trace with hash -381847411, now seen corresponding path program 84 times [2021-05-02 13:32:24,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:24,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190430050] [2021-05-02 13:32:24,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:24,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:24,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:24,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:24,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:24,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:25,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:32:25,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:25,615 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:32:25,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:25,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190430050] [2021-05-02 13:32:25,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190430050] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:25,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409731452] [2021-05-02 13:32:25,616 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:25,673 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:32:25,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:25,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:32:25,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:26,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:26,651 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:32:26,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409731452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:26,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:26,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 45 [2021-05-02 13:32:26,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554018863] [2021-05-02 13:32:26,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:32:26,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:26,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:32:26,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1871, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:32:26,652 INFO L87 Difference]: Start difference. First operand 910 states and 1014 transitions. Second operand has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:31,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:31,436 INFO L93 Difference]: Finished difference Result 916 states and 1019 transitions. [2021-05-02 13:32:31,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:32:31,437 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:32:31,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:31,440 INFO L225 Difference]: With dead ends: 916 [2021-05-02 13:32:31,440 INFO L226 Difference]: Without dead ends: 890 [2021-05-02 13:32:31,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 887 ImplicationChecksByTransitivity, 3270.4ms TimeCoverageRelationStatistics Valid=283, Invalid=5417, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:32:31,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2021-05-02 13:32:31,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 890. [2021-05-02 13:32:31,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 890 states, 782 states have (on average 1.1304347826086956) internal successors, (884), 848 states have internal predecessors, (884), 38 states have call successors, (38), 5 states have call predecessors, (38), 69 states have return successors, (70), 36 states have call predecessors, (70), 36 states have call successors, (70) [2021-05-02 13:32:31,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 890 states to 890 states and 992 transitions. [2021-05-02 13:32:31,596 INFO L78 Accepts]: Start accepts. Automaton has 890 states and 992 transitions. Word has length 57 [2021-05-02 13:32:31,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:31,596 INFO L480 AbstractCegarLoop]: Abstraction has 890 states and 992 transitions. [2021-05-02 13:32:31,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:31,596 INFO L276 IsEmpty]: Start isEmpty. Operand 890 states and 992 transitions. [2021-05-02 13:32:31,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:32:31,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:31,601 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:31,801 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable159 [2021-05-02 13:32:31,801 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:31,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:31,801 INFO L82 PathProgramCache]: Analyzing trace with hash -799098675, now seen corresponding path program 85 times [2021-05-02 13:32:31,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:31,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851391882] [2021-05-02 13:32:31,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:31,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:31,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:31,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:31,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:31,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:32,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:32:32,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:32,640 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:32:32,640 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:32,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851391882] [2021-05-02 13:32:32,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851391882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:32,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417911922] [2021-05-02 13:32:32,641 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:32,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:32,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:32:32,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:33,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:33,775 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:32:33,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417911922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:33,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:33,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 45 [2021-05-02 13:32:33,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983433378] [2021-05-02 13:32:33,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:32:33,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:33,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:32:33,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1867, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:32:33,777 INFO L87 Difference]: Start difference. First operand 890 states and 992 transitions. Second operand has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:37,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:37,490 INFO L93 Difference]: Finished difference Result 896 states and 997 transitions. [2021-05-02 13:32:37,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:32:37,492 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:32:37,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:37,495 INFO L225 Difference]: With dead ends: 896 [2021-05-02 13:32:37,495 INFO L226 Difference]: Without dead ends: 868 [2021-05-02 13:32:37,498 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 887 ImplicationChecksByTransitivity, 3202.7ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:32:37,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 868 states. [2021-05-02 13:32:37,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 868 to 868. [2021-05-02 13:32:37,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 868 states, 763 states have (on average 1.1310615989515072) internal successors, (863), 827 states have internal predecessors, (863), 37 states have call successors, (37), 5 states have call predecessors, (37), 67 states have return successors, (68), 35 states have call predecessors, (68), 35 states have call successors, (68) [2021-05-02 13:32:37,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 868 states to 868 states and 968 transitions. [2021-05-02 13:32:37,637 INFO L78 Accepts]: Start accepts. Automaton has 868 states and 968 transitions. Word has length 57 [2021-05-02 13:32:37,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:37,637 INFO L480 AbstractCegarLoop]: Abstraction has 868 states and 968 transitions. [2021-05-02 13:32:37,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:37,638 INFO L276 IsEmpty]: Start isEmpty. Operand 868 states and 968 transitions. [2021-05-02 13:32:37,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:32:37,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:37,644 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:37,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable162,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:37,857 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:37,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:37,857 INFO L82 PathProgramCache]: Analyzing trace with hash -589678451, now seen corresponding path program 86 times [2021-05-02 13:32:37,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:37,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550730152] [2021-05-02 13:32:37,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:37,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:37,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:37,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:37,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:37,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:38,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:32:38,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:38,640 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:32:38,640 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:38,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550730152] [2021-05-02 13:32:38,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550730152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:38,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353491898] [2021-05-02 13:32:38,640 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:38,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:32:38,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:38,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 13:32:38,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:39,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,878 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:32:39,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353491898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:39,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:39,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 45 [2021-05-02 13:32:39,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332948125] [2021-05-02 13:32:39,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:32:39,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:39,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:32:39,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1863, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:32:39,879 INFO L87 Difference]: Start difference. First operand 868 states and 968 transitions. Second operand has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:42,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:42,575 INFO L93 Difference]: Finished difference Result 886 states and 989 transitions. [2021-05-02 13:32:42,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:32:42,577 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:32:42,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:42,581 INFO L225 Difference]: With dead ends: 886 [2021-05-02 13:32:42,581 INFO L226 Difference]: Without dead ends: 880 [2021-05-02 13:32:42,584 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 887 ImplicationChecksByTransitivity, 3124.4ms TimeCoverageRelationStatistics Valid=287, Invalid=4825, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:32:42,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 880 states. [2021-05-02 13:32:42,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 880 to 878. [2021-05-02 13:32:42,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 878 states, 770 states have (on average 1.1324675324675324) internal successors, (872), 836 states have internal predecessors, (872), 38 states have call successors, (38), 5 states have call predecessors, (38), 69 states have return successors, (71), 36 states have call predecessors, (71), 36 states have call successors, (71) [2021-05-02 13:32:42,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 878 states to 878 states and 981 transitions. [2021-05-02 13:32:42,731 INFO L78 Accepts]: Start accepts. Automaton has 878 states and 981 transitions. Word has length 57 [2021-05-02 13:32:42,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:42,731 INFO L480 AbstractCegarLoop]: Abstraction has 878 states and 981 transitions. [2021-05-02 13:32:42,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 39 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:32:42,732 INFO L276 IsEmpty]: Start isEmpty. Operand 878 states and 981 transitions. [2021-05-02 13:32:42,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:32:42,736 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:42,736 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:42,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable165 [2021-05-02 13:32:42,941 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:42,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:42,941 INFO L82 PathProgramCache]: Analyzing trace with hash -2119764308, now seen corresponding path program 87 times [2021-05-02 13:32:42,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:42,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409651235] [2021-05-02 13:32:42,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:42,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:42,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:42,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:42,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:42,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:43,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:32:43,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:43,849 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:32:43,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:43,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409651235] [2021-05-02 13:32:43,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409651235] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:43,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344134498] [2021-05-02 13:32:43,849 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:43,907 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 13:32:43,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:43,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:32:43,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:43,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:43,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:44,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:45,727 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:32:45,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344134498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:45,728 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:45,728 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 29] total 55 [2021-05-02 13:32:45,728 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569871938] [2021-05-02 13:32:45,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 13:32:45,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:45,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 13:32:45,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2838, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:32:45,729 INFO L87 Difference]: Start difference. First operand 878 states and 981 transitions. Second operand has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 54 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:32:55,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:55,480 INFO L93 Difference]: Finished difference Result 996 states and 1120 transitions. [2021-05-02 13:32:55,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:32:55,482 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 54 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 58 [2021-05-02 13:32:55,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:55,489 INFO L225 Difference]: With dead ends: 996 [2021-05-02 13:32:55,489 INFO L226 Difference]: Without dead ends: 982 [2021-05-02 13:32:55,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 712 ImplicationChecksByTransitivity, 4689.8ms TimeCoverageRelationStatistics Valid=275, Invalid=6531, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 13:32:55,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 982 states. [2021-05-02 13:32:55,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 982 to 973. [2021-05-02 13:32:55,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 973 states, 853 states have (on average 1.1313012895662369) internal successors, (965), 927 states have internal predecessors, (965), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (83), 40 states have call predecessors, (83), 40 states have call successors, (83) [2021-05-02 13:32:55,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 973 states to 973 states and 1090 transitions. [2021-05-02 13:32:55,671 INFO L78 Accepts]: Start accepts. Automaton has 973 states and 1090 transitions. Word has length 58 [2021-05-02 13:32:55,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:55,671 INFO L480 AbstractCegarLoop]: Abstraction has 973 states and 1090 transitions. [2021-05-02 13:32:55,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 54 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:32:55,672 INFO L276 IsEmpty]: Start isEmpty. Operand 973 states and 1090 transitions. [2021-05-02 13:32:55,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:32:55,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:55,677 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:55,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable168 [2021-05-02 13:32:55,877 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:55,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:55,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1227955953, now seen corresponding path program 88 times [2021-05-02 13:32:55,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:55,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924374858] [2021-05-02 13:32:55,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:55,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:55,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:32:55,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:55,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:32:55,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:56,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:32:56,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:56,925 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:32:56,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:56,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924374858] [2021-05-02 13:32:56,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924374858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:56,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879312870] [2021-05-02 13:32:56,925 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:56,973 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:32:56,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:56,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:32:56,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:57,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:57,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:58,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:59,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:59,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:59,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:59,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:59,104 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:32:59,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879312870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:59,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:32:59,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 29] total 55 [2021-05-02 13:32:59,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602678804] [2021-05-02 13:32:59,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 13:32:59,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:59,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 13:32:59,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2838, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:32:59,105 INFO L87 Difference]: Start difference. First operand 973 states and 1090 transitions. Second operand has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 54 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:33:08,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:08,299 INFO L93 Difference]: Finished difference Result 988 states and 1105 transitions. [2021-05-02 13:33:08,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:33:08,301 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 54 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 58 [2021-05-02 13:33:08,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:08,304 INFO L225 Difference]: With dead ends: 988 [2021-05-02 13:33:08,304 INFO L226 Difference]: Without dead ends: 976 [2021-05-02 13:33:08,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 726 ImplicationChecksByTransitivity, 5336.2ms TimeCoverageRelationStatistics Valid=275, Invalid=6531, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 13:33:08,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 976 states. [2021-05-02 13:33:08,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 976 to 974. [2021-05-02 13:33:08,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 974 states, 854 states have (on average 1.1311475409836065) internal successors, (966), 928 states have internal predecessors, (966), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (78), 40 states have call predecessors, (78), 40 states have call successors, (78) [2021-05-02 13:33:08,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 974 states to 974 states and 1086 transitions. [2021-05-02 13:33:08,466 INFO L78 Accepts]: Start accepts. Automaton has 974 states and 1086 transitions. Word has length 58 [2021-05-02 13:33:08,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:08,466 INFO L480 AbstractCegarLoop]: Abstraction has 974 states and 1086 transitions. [2021-05-02 13:33:08,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 54 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:33:08,466 INFO L276 IsEmpty]: Start isEmpty. Operand 974 states and 1086 transitions. [2021-05-02 13:33:08,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:33:08,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:08,471 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:08,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable169 [2021-05-02 13:33:08,673 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:08,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:08,673 INFO L82 PathProgramCache]: Analyzing trace with hash 248974061, now seen corresponding path program 89 times [2021-05-02 13:33:08,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:08,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939212742] [2021-05-02 13:33:08,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:08,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:08,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:08,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:08,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:33:08,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:08,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:33:08,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:08,982 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:33:08,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:08,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939212742] [2021-05-02 13:33:08,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939212742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:08,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781778891] [2021-05-02 13:33:08,983 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:09,129 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:33:09,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:09,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:33:09,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:09,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:09,543 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:33:09,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781778891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:09,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:09,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 24 [2021-05-02 13:33:09,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100021677] [2021-05-02 13:33:09,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:33:09,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:09,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:33:09,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:33:09,544 INFO L87 Difference]: Start difference. First operand 974 states and 1086 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:33:12,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:12,218 INFO L93 Difference]: Finished difference Result 1174 states and 1323 transitions. [2021-05-02 13:33:12,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:33:12,220 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 58 [2021-05-02 13:33:12,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:12,225 INFO L225 Difference]: With dead ends: 1174 [2021-05-02 13:33:12,225 INFO L226 Difference]: Without dead ends: 1120 [2021-05-02 13:33:12,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 2417.5ms TimeCoverageRelationStatistics Valid=856, Invalid=2566, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:33:12,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1120 states. [2021-05-02 13:33:12,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1120 to 1084. [2021-05-02 13:33:12,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1084 states, 964 states have (on average 1.129668049792531) internal successors, (1089), 1038 states have internal predecessors, (1089), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (78), 40 states have call predecessors, (78), 40 states have call successors, (78) [2021-05-02 13:33:12,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1084 states to 1084 states and 1209 transitions. [2021-05-02 13:33:12,443 INFO L78 Accepts]: Start accepts. Automaton has 1084 states and 1209 transitions. Word has length 58 [2021-05-02 13:33:12,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:12,443 INFO L480 AbstractCegarLoop]: Abstraction has 1084 states and 1209 transitions. [2021-05-02 13:33:12,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:33:12,443 INFO L276 IsEmpty]: Start isEmpty. Operand 1084 states and 1209 transitions. [2021-05-02 13:33:12,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:33:12,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:12,449 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:12,649 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:12,650 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:12,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:12,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1022687022, now seen corresponding path program 90 times [2021-05-02 13:33:12,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:12,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438424714] [2021-05-02 13:33:12,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:12,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:12,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:12,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:12,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:33:12,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:12,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:33:12,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:12,905 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:33:12,905 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:12,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438424714] [2021-05-02 13:33:12,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438424714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:12,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74221095] [2021-05-02 13:33:12,906 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:12,965 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:33:12,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:12,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:33:12,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:12,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:12,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:12,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:13,337 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-02 13:33:13,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74221095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:13,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:13,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 24 [2021-05-02 13:33:13,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457925610] [2021-05-02 13:33:13,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:33:13,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:13,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:33:13,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:33:13,338 INFO L87 Difference]: Start difference. First operand 1084 states and 1209 transitions. Second operand has 24 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 states have internal predecessors, (59), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:15,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:15,935 INFO L93 Difference]: Finished difference Result 1860 states and 2065 transitions. [2021-05-02 13:33:15,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:33:15,937 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 states have internal predecessors, (59), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 58 [2021-05-02 13:33:15,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:15,951 INFO L225 Difference]: With dead ends: 1860 [2021-05-02 13:33:15,951 INFO L226 Difference]: Without dead ends: 1230 [2021-05-02 13:33:15,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 2363.9ms TimeCoverageRelationStatistics Valid=856, Invalid=2566, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:33:15,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1230 states. [2021-05-02 13:33:16,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1230 to 1194. [2021-05-02 13:33:16,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1194 states, 1074 states have (on average 1.1284916201117319) internal successors, (1212), 1148 states have internal predecessors, (1212), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (78), 40 states have call predecessors, (78), 40 states have call successors, (78) [2021-05-02 13:33:16,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1194 states to 1194 states and 1332 transitions. [2021-05-02 13:33:16,192 INFO L78 Accepts]: Start accepts. Automaton has 1194 states and 1332 transitions. Word has length 58 [2021-05-02 13:33:16,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:16,192 INFO L480 AbstractCegarLoop]: Abstraction has 1194 states and 1332 transitions. [2021-05-02 13:33:16,192 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 states have internal predecessors, (59), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:16,192 INFO L276 IsEmpty]: Start isEmpty. Operand 1194 states and 1332 transitions. [2021-05-02 13:33:16,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:33:16,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:16,198 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:16,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171,91 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:16,399 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:16,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:16,399 INFO L82 PathProgramCache]: Analyzing trace with hash -431401302, now seen corresponding path program 91 times [2021-05-02 13:33:16,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:16,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430929671] [2021-05-02 13:33:16,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:16,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:16,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:16,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:16,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:33:16,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:17,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:33:17,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:18,009 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 158 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:33:18,009 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:18,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430929671] [2021-05-02 13:33:18,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430929671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:18,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675767763] [2021-05-02 13:33:18,010 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:18,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:18,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 13:33:18,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:18,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:18,813 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 158 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:33:18,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675767763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:18,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:18,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 47 [2021-05-02 13:33:18,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685618538] [2021-05-02 13:33:18,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:33:18,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:18,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:33:18,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2061, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:33:18,815 INFO L87 Difference]: Start difference. First operand 1194 states and 1332 transitions. Second operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:29,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:29,269 INFO L93 Difference]: Finished difference Result 1336 states and 1491 transitions. [2021-05-02 13:33:29,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 13:33:29,271 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 59 [2021-05-02 13:33:29,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:29,278 INFO L225 Difference]: With dead ends: 1336 [2021-05-02 13:33:29,278 INFO L226 Difference]: Without dead ends: 1330 [2021-05-02 13:33:29,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 4700.5ms TimeCoverageRelationStatistics Valid=289, Invalid=7021, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 13:33:29,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1330 states. [2021-05-02 13:33:29,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1330 to 1210. [2021-05-02 13:33:29,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1210 states, 1087 states have (on average 1.1287948482060717) internal successors, (1227), 1163 states have internal predecessors, (1227), 43 states have call successors, (43), 5 states have call predecessors, (43), 79 states have return successors, (81), 41 states have call predecessors, (81), 41 states have call successors, (81) [2021-05-02 13:33:29,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1210 states to 1210 states and 1351 transitions. [2021-05-02 13:33:29,526 INFO L78 Accepts]: Start accepts. Automaton has 1210 states and 1351 transitions. Word has length 59 [2021-05-02 13:33:29,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:29,526 INFO L480 AbstractCegarLoop]: Abstraction has 1210 states and 1351 transitions. [2021-05-02 13:33:29,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:29,526 INFO L276 IsEmpty]: Start isEmpty. Operand 1210 states and 1351 transitions. [2021-05-02 13:33:29,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:33:29,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:29,532 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:29,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable172 [2021-05-02 13:33:29,733 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:29,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:29,733 INFO L82 PathProgramCache]: Analyzing trace with hash -279498742, now seen corresponding path program 92 times [2021-05-02 13:33:29,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:29,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402174762] [2021-05-02 13:33:29,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:29,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:29,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:29,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:29,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:33:29,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:30,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:33:30,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:31,258 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 116 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:33:31,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:31,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402174762] [2021-05-02 13:33:31,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402174762] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:31,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315189960] [2021-05-02 13:33:31,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:31,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:31,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:31,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 13:33:31,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:31,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:31,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:32,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:32,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:32,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:32,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:32,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:32,309 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 116 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:33:32,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315189960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:32,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:32,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 47 [2021-05-02 13:33:32,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464638200] [2021-05-02 13:33:32,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:33:32,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:32,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:33:32,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2057, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:33:32,311 INFO L87 Difference]: Start difference. First operand 1210 states and 1351 transitions. Second operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:41,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:41,265 INFO L93 Difference]: Finished difference Result 1216 states and 1356 transitions. [2021-05-02 13:33:41,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:33:41,267 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 59 [2021-05-02 13:33:41,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:41,272 INFO L225 Difference]: With dead ends: 1216 [2021-05-02 13:33:41,272 INFO L226 Difference]: Without dead ends: 1194 [2021-05-02 13:33:41,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 4769.6ms TimeCoverageRelationStatistics Valid=291, Invalid=6681, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:33:41,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1194 states. [2021-05-02 13:33:41,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1194 to 1194. [2021-05-02 13:33:41,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1194 states, 1074 states have (on average 1.1284916201117319) internal successors, (1212), 1148 states have internal predecessors, (1212), 42 states have call successors, (42), 5 states have call predecessors, (42), 77 states have return successors, (79), 40 states have call predecessors, (79), 40 states have call successors, (79) [2021-05-02 13:33:41,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1194 states to 1194 states and 1333 transitions. [2021-05-02 13:33:41,495 INFO L78 Accepts]: Start accepts. Automaton has 1194 states and 1333 transitions. Word has length 59 [2021-05-02 13:33:41,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:41,496 INFO L480 AbstractCegarLoop]: Abstraction has 1194 states and 1333 transitions. [2021-05-02 13:33:41,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:41,496 INFO L276 IsEmpty]: Start isEmpty. Operand 1194 states and 1333 transitions. [2021-05-02 13:33:41,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:33:41,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:41,502 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:41,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:41,703 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:41,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:41,703 INFO L82 PathProgramCache]: Analyzing trace with hash -2125532374, now seen corresponding path program 93 times [2021-05-02 13:33:41,703 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:41,703 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089672779] [2021-05-02 13:33:41,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:41,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:41,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:41,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:41,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:33:41,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:42,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:33:42,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:43,131 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:33:43,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:43,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089672779] [2021-05-02 13:33:43,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089672779] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:43,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056284026] [2021-05-02 13:33:43,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:43,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:33:43,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:43,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:33:43,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:43,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:43,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:44,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:44,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:44,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:44,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:44,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:44,379 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:33:44,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056284026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:44,380 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:44,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 47 [2021-05-02 13:33:44,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74350143] [2021-05-02 13:33:44,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:33:44,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:44,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:33:44,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2053, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:33:44,381 INFO L87 Difference]: Start difference. First operand 1194 states and 1333 transitions. Second operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:52,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:52,456 INFO L93 Difference]: Finished difference Result 1200 states and 1338 transitions. [2021-05-02 13:33:52,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:33:52,458 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 59 [2021-05-02 13:33:52,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:52,463 INFO L225 Difference]: With dead ends: 1200 [2021-05-02 13:33:52,463 INFO L226 Difference]: Without dead ends: 1176 [2021-05-02 13:33:52,471 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 4789.0ms TimeCoverageRelationStatistics Valid=293, Invalid=6349, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:33:52,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1176 states. [2021-05-02 13:33:52,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1176 to 1176. [2021-05-02 13:33:52,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1176 states, 1059 states have (on average 1.1284230406043436) internal successors, (1195), 1131 states have internal predecessors, (1195), 41 states have call successors, (41), 5 states have call predecessors, (41), 75 states have return successors, (77), 39 states have call predecessors, (77), 39 states have call successors, (77) [2021-05-02 13:33:52,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1176 states to 1176 states and 1313 transitions. [2021-05-02 13:33:52,741 INFO L78 Accepts]: Start accepts. Automaton has 1176 states and 1313 transitions. Word has length 59 [2021-05-02 13:33:52,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:52,741 INFO L480 AbstractCegarLoop]: Abstraction has 1176 states and 1313 transitions. [2021-05-02 13:33:52,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:33:52,741 INFO L276 IsEmpty]: Start isEmpty. Operand 1176 states and 1313 transitions. [2021-05-02 13:33:52,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:33:52,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:52,747 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:52,947 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable178 [2021-05-02 13:33:52,948 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:52,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:52,948 INFO L82 PathProgramCache]: Analyzing trace with hash 565515146, now seen corresponding path program 94 times [2021-05-02 13:33:52,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:52,948 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012545188] [2021-05-02 13:33:52,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:52,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:53,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:33:53,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:53,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:33:53,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:53,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:33:53,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:54,456 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:33:54,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:54,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012545188] [2021-05-02 13:33:54,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012545188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:54,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361049618] [2021-05-02 13:33:54,457 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:54,517 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:33:54,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:54,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 13:33:54,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:55,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:55,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:56,013 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:33:56,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361049618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:56,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:33:56,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 47 [2021-05-02 13:33:56,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631841617] [2021-05-02 13:33:56,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:33:56,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:56,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:33:56,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=2049, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:33:56,015 INFO L87 Difference]: Start difference. First operand 1176 states and 1313 transitions. Second operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:34:04,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:04,073 INFO L93 Difference]: Finished difference Result 1182 states and 1318 transitions. [2021-05-02 13:34:04,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:34:04,076 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 59 [2021-05-02 13:34:04,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:04,080 INFO L225 Difference]: With dead ends: 1182 [2021-05-02 13:34:04,080 INFO L226 Difference]: Without dead ends: 1156 [2021-05-02 13:34:04,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 5066.4ms TimeCoverageRelationStatistics Valid=295, Invalid=6025, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 13:34:04,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-05-02 13:34:04,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 1156. [2021-05-02 13:34:04,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1156 states, 1042 states have (on average 1.128598848368522) internal successors, (1176), 1112 states have internal predecessors, (1176), 40 states have call successors, (40), 5 states have call predecessors, (40), 73 states have return successors, (75), 38 states have call predecessors, (75), 38 states have call successors, (75) [2021-05-02 13:34:04,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1156 states to 1156 states and 1291 transitions. [2021-05-02 13:34:04,315 INFO L78 Accepts]: Start accepts. Automaton has 1156 states and 1291 transitions. Word has length 59 [2021-05-02 13:34:04,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:04,315 INFO L480 AbstractCegarLoop]: Abstraction has 1156 states and 1291 transitions. [2021-05-02 13:34:04,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:34:04,315 INFO L276 IsEmpty]: Start isEmpty. Operand 1156 states and 1291 transitions. [2021-05-02 13:34:04,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:34:04,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:04,321 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:04,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable181,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:04,521 INFO L428 AbstractCegarLoop]: === Iteration 105 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:04,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:04,522 INFO L82 PathProgramCache]: Analyzing trace with hash -532705366, now seen corresponding path program 95 times [2021-05-02 13:34:04,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:04,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348442523] [2021-05-02 13:34:04,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:04,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:04,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:04,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:04,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:34:04,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:05,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:34:05,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:05,926 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:34:05,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:05,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348442523] [2021-05-02 13:34:05,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348442523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:05,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893883241] [2021-05-02 13:34:05,927 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:05,983 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:34:05,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:05,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:34:05,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:06,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:06,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:07,604 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:34:07,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893883241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:07,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:07,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 47 [2021-05-02 13:34:07,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917934407] [2021-05-02 13:34:07,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:34:07,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:07,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:34:07,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=2045, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:34:07,605 INFO L87 Difference]: Start difference. First operand 1156 states and 1291 transitions. Second operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:34:13,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:13,458 INFO L93 Difference]: Finished difference Result 1162 states and 1296 transitions. [2021-05-02 13:34:13,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:34:13,460 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 59 [2021-05-02 13:34:13,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:13,464 INFO L225 Difference]: With dead ends: 1162 [2021-05-02 13:34:13,465 INFO L226 Difference]: Without dead ends: 1134 [2021-05-02 13:34:13,470 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 4896.1ms TimeCoverageRelationStatistics Valid=297, Invalid=5709, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:34:13,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1134 states. [2021-05-02 13:34:13,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1134 to 1134. [2021-05-02 13:34:13,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1134 states, 1023 states have (on average 1.1290322580645162) internal successors, (1155), 1091 states have internal predecessors, (1155), 39 states have call successors, (39), 5 states have call predecessors, (39), 71 states have return successors, (73), 37 states have call predecessors, (73), 37 states have call successors, (73) [2021-05-02 13:34:13,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1134 states to 1134 states and 1267 transitions. [2021-05-02 13:34:13,691 INFO L78 Accepts]: Start accepts. Automaton has 1134 states and 1267 transitions. Word has length 59 [2021-05-02 13:34:13,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:13,691 INFO L480 AbstractCegarLoop]: Abstraction has 1134 states and 1267 transitions. [2021-05-02 13:34:13,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:34:13,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1134 states and 1267 transitions. [2021-05-02 13:34:13,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:34:13,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:13,697 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:13,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable184,96 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:13,897 INFO L428 AbstractCegarLoop]: === Iteration 106 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:13,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:13,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1671481989, now seen corresponding path program 96 times [2021-05-02 13:34:13,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:13,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192211770] [2021-05-02 13:34:13,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:13,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:13,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:13,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:13,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:34:13,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:14,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:34:14,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:14,640 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:34:14,640 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:14,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192211770] [2021-05-02 13:34:14,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192211770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:14,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602684550] [2021-05-02 13:34:14,641 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:14,697 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:34:14,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:14,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:34:14,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:14,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:14,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:15,943 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 13:34:15,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602684550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:15,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:15,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 19] total 37 [2021-05-02 13:34:15,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418068818] [2021-05-02 13:34:15,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:34:15,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:15,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:34:15,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1243, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:34:15,944 INFO L87 Difference]: Start difference. First operand 1134 states and 1267 transitions. Second operand has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:34:22,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:22,239 INFO L93 Difference]: Finished difference Result 1238 states and 1393 transitions. [2021-05-02 13:34:22,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:34:22,242 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 59 [2021-05-02 13:34:22,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:22,257 INFO L225 Difference]: With dead ends: 1238 [2021-05-02 13:34:22,257 INFO L226 Difference]: Without dead ends: 1219 [2021-05-02 13:34:22,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 3081.0ms TimeCoverageRelationStatistics Valid=187, Invalid=2783, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:34:22,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1219 states. [2021-05-02 13:34:22,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1219 to 1214. [2021-05-02 13:34:22,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1214 states, 1070 states have (on average 1.122429906542056) internal successors, (1201), 1160 states have internal predecessors, (1201), 50 states have call successors, (50), 5 states have call predecessors, (50), 93 states have return successors, (106), 48 states have call predecessors, (106), 48 states have call successors, (106) [2021-05-02 13:34:22,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1214 states to 1214 states and 1357 transitions. [2021-05-02 13:34:22,558 INFO L78 Accepts]: Start accepts. Automaton has 1214 states and 1357 transitions. Word has length 59 [2021-05-02 13:34:22,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:22,558 INFO L480 AbstractCegarLoop]: Abstraction has 1214 states and 1357 transitions. [2021-05-02 13:34:22,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:34:22,558 INFO L276 IsEmpty]: Start isEmpty. Operand 1214 states and 1357 transitions. [2021-05-02 13:34:22,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:34:22,564 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:22,565 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:22,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable187 [2021-05-02 13:34:22,765 INFO L428 AbstractCegarLoop]: === Iteration 107 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:22,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:22,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1489237770, now seen corresponding path program 97 times [2021-05-02 13:34:22,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:22,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801574417] [2021-05-02 13:34:22,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:22,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:22,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:22,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:22,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:34:22,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:23,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:34:23,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:24,111 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:34:24,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:24,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801574417] [2021-05-02 13:34:24,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801574417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:24,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913348962] [2021-05-02 13:34:24,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:24,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:24,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:34:24,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:24,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:24,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:25,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:25,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:25,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:25,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:25,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:25,989 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:34:25,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913348962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:25,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:25,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 47 [2021-05-02 13:34:25,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239825544] [2021-05-02 13:34:25,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:34:25,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:25,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:34:25,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=2041, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:34:25,990 INFO L87 Difference]: Start difference. First operand 1214 states and 1357 transitions. Second operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:34:30,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:30,671 INFO L93 Difference]: Finished difference Result 1232 states and 1379 transitions. [2021-05-02 13:34:30,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:34:30,673 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 59 [2021-05-02 13:34:30,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:30,681 INFO L225 Difference]: With dead ends: 1232 [2021-05-02 13:34:30,681 INFO L226 Difference]: Without dead ends: 1213 [2021-05-02 13:34:30,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 4946.2ms TimeCoverageRelationStatistics Valid=299, Invalid=5401, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:34:30,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2021-05-02 13:34:30,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1208. [2021-05-02 13:34:30,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1208 states, 1064 states have (on average 1.1240601503759398) internal successors, (1196), 1154 states have internal predecessors, (1196), 50 states have call successors, (50), 5 states have call predecessors, (50), 93 states have return successors, (106), 48 states have call predecessors, (106), 48 states have call successors, (106) [2021-05-02 13:34:30,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1208 states to 1208 states and 1352 transitions. [2021-05-02 13:34:30,936 INFO L78 Accepts]: Start accepts. Automaton has 1208 states and 1352 transitions. Word has length 59 [2021-05-02 13:34:30,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:30,937 INFO L480 AbstractCegarLoop]: Abstraction has 1208 states and 1352 transitions. [2021-05-02 13:34:30,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 41 states have internal predecessors, (59), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:34:30,937 INFO L276 IsEmpty]: Start isEmpty. Operand 1208 states and 1352 transitions. [2021-05-02 13:34:30,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:34:30,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:30,944 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable188 [2021-05-02 13:34:31,145 INFO L428 AbstractCegarLoop]: === Iteration 108 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,146 INFO L82 PathProgramCache]: Analyzing trace with hash 930505855, now seen corresponding path program 98 times [2021-05-02 13:34:31,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133392507] [2021-05-02 13:34:31,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:34:31,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:34:31,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,830 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:34:31,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133392507] [2021-05-02 13:34:31,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133392507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:31,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763842586] [2021-05-02 13:34:31,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:31,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:34:31,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:31,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:34:31,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:31,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:31,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,097 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 13:34:33,097 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763842586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:33,097 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:33,097 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 19] total 37 [2021-05-02 13:34:33,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949863619] [2021-05-02 13:34:33,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:34:33,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:33,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:34:33,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1243, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:34:33,098 INFO L87 Difference]: Start difference. First operand 1208 states and 1352 transitions. Second operand has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:34:38,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:38,223 INFO L93 Difference]: Finished difference Result 1222 states and 1365 transitions. [2021-05-02 13:34:38,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:34:38,226 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 59 [2021-05-02 13:34:38,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:38,231 INFO L225 Difference]: With dead ends: 1222 [2021-05-02 13:34:38,231 INFO L226 Difference]: Without dead ends: 1194 [2021-05-02 13:34:38,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 2916.7ms TimeCoverageRelationStatistics Valid=187, Invalid=2783, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:34:38,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1194 states. [2021-05-02 13:34:38,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1194 to 1192. [2021-05-02 13:34:38,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1192 states, 1048 states have (on average 1.1240458015267176) internal successors, (1178), 1138 states have internal predecessors, (1178), 50 states have call successors, (50), 5 states have call predecessors, (50), 93 states have return successors, (96), 48 states have call predecessors, (96), 48 states have call successors, (96) [2021-05-02 13:34:38,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1192 states to 1192 states and 1324 transitions. [2021-05-02 13:34:38,466 INFO L78 Accepts]: Start accepts. Automaton has 1192 states and 1324 transitions. Word has length 59 [2021-05-02 13:34:38,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:38,466 INFO L480 AbstractCegarLoop]: Abstraction has 1192 states and 1324 transitions. [2021-05-02 13:34:38,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:34:38,466 INFO L276 IsEmpty]: Start isEmpty. Operand 1192 states and 1324 transitions. [2021-05-02 13:34:38,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:34:38,473 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:38,473 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:38,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191,99 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:38,674 INFO L428 AbstractCegarLoop]: === Iteration 109 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:38,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:38,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1508010897, now seen corresponding path program 99 times [2021-05-02 13:34:38,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:38,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985325558] [2021-05-02 13:34:38,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:38,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:38,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:38,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:38,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:34:38,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:39,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:34:39,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:40,145 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:34:40,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:40,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985325558] [2021-05-02 13:34:40,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985325558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:40,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660705904] [2021-05-02 13:34:40,146 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:40,207 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 13:34:40,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:40,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 13:34:40,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:40,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:40,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,478 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:34:43,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660705904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:43,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:43,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 31] total 59 [2021-05-02 13:34:43,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989604237] [2021-05-02 13:34:43,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 13:34:43,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:43,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 13:34:43,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=3280, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:34:43,480 INFO L87 Difference]: Start difference. First operand 1192 states and 1324 transitions. Second operand has 59 states, 59 states have (on average 1.4576271186440677) internal successors, (86), 58 states have internal predecessors, (86), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:35:01,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:01,861 INFO L93 Difference]: Finished difference Result 1336 states and 1493 transitions. [2021-05-02 13:35:01,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:35:01,864 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.4576271186440677) internal successors, (86), 58 states have internal predecessors, (86), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-05-02 13:35:01,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:01,882 INFO L225 Difference]: With dead ends: 1336 [2021-05-02 13:35:01,882 INFO L226 Difference]: Without dead ends: 1322 [2021-05-02 13:35:01,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 7971.2ms TimeCoverageRelationStatistics Valid=295, Invalid=7537, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 13:35:01,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2021-05-02 13:35:02,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1313. [2021-05-02 13:35:02,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1313 states, 1154 states have (on average 1.123050259965338) internal successors, (1296), 1254 states have internal predecessors, (1296), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (111), 53 states have call predecessors, (111), 53 states have call successors, (111) [2021-05-02 13:35:02,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1313 states to 1313 states and 1462 transitions. [2021-05-02 13:35:02,226 INFO L78 Accepts]: Start accepts. Automaton has 1313 states and 1462 transitions. Word has length 60 [2021-05-02 13:35:02,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:02,226 INFO L480 AbstractCegarLoop]: Abstraction has 1313 states and 1462 transitions. [2021-05-02 13:35:02,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.4576271186440677) internal successors, (86), 58 states have internal predecessors, (86), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:35:02,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1313 states and 1462 transitions. [2021-05-02 13:35:02,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:35:02,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:02,239 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:02,446 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable192 [2021-05-02 13:35:02,446 INFO L428 AbstractCegarLoop]: === Iteration 110 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:02,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:02,447 INFO L82 PathProgramCache]: Analyzing trace with hash 368244332, now seen corresponding path program 100 times [2021-05-02 13:35:02,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:02,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560082557] [2021-05-02 13:35:02,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:02,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:02,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:02,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:02,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:35:02,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:03,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:35:03,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:04,184 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:35:04,184 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:04,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560082557] [2021-05-02 13:35:04,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560082557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:04,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814572029] [2021-05-02 13:35:04,184 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:04,235 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:35:04,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:04,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 13:35:04,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:04,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:05,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:06,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:07,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:08,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:08,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:08,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:08,066 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:35:08,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1814572029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:08,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:08,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 31] total 59 [2021-05-02 13:35:08,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582828511] [2021-05-02 13:35:08,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 13:35:08,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:08,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 13:35:08,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=3280, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:35:08,067 INFO L87 Difference]: Start difference. First operand 1313 states and 1462 transitions. Second operand has 59 states, 59 states have (on average 1.4576271186440677) internal successors, (86), 58 states have internal predecessors, (86), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:35:29,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:29,397 INFO L93 Difference]: Finished difference Result 1328 states and 1477 transitions. [2021-05-02 13:35:29,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:35:29,400 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.4576271186440677) internal successors, (86), 58 states have internal predecessors, (86), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-05-02 13:35:29,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:29,405 INFO L225 Difference]: With dead ends: 1328 [2021-05-02 13:35:29,405 INFO L226 Difference]: Without dead ends: 1316 [2021-05-02 13:35:29,413 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 838 ImplicationChecksByTransitivity, 9130.4ms TimeCoverageRelationStatistics Valid=295, Invalid=7537, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 13:35:29,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1316 states. [2021-05-02 13:35:29,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1316 to 1314. [2021-05-02 13:35:29,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1314 states, 1155 states have (on average 1.122943722943723) internal successors, (1297), 1255 states have internal predecessors, (1297), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (105), 53 states have call predecessors, (105), 53 states have call successors, (105) [2021-05-02 13:35:29,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1314 states to 1314 states and 1457 transitions. [2021-05-02 13:35:29,682 INFO L78 Accepts]: Start accepts. Automaton has 1314 states and 1457 transitions. Word has length 60 [2021-05-02 13:35:29,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:29,682 INFO L480 AbstractCegarLoop]: Abstraction has 1314 states and 1457 transitions. [2021-05-02 13:35:29,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.4576271186440677) internal successors, (86), 58 states have internal predecessors, (86), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:35:29,682 INFO L276 IsEmpty]: Start isEmpty. Operand 1314 states and 1457 transitions. [2021-05-02 13:35:29,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:35:29,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:29,691 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:29,891 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable193,101 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:29,891 INFO L428 AbstractCegarLoop]: === Iteration 111 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:29,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:29,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1252044946, now seen corresponding path program 101 times [2021-05-02 13:35:29,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:29,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149546336] [2021-05-02 13:35:29,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:29,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:29,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:29,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:29,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:35:29,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:30,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:35:30,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:30,235 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:35:30,235 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:30,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149546336] [2021-05-02 13:35:30,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149546336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:30,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697577843] [2021-05-02 13:35:30,236 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:30,293 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:35:30,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:30,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:35:30,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:30,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:30,871 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:35:30,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697577843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:30,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:30,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 25 [2021-05-02 13:35:30,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147773834] [2021-05-02 13:35:30,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:35:30,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:30,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:35:30,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=399, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:35:30,872 INFO L87 Difference]: Start difference. First operand 1314 states and 1457 transitions. Second operand has 25 states, 25 states have (on average 2.36) internal successors, (59), 24 states have internal predecessors, (59), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:35:34,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:34,379 INFO L93 Difference]: Finished difference Result 1985 states and 2169 transitions. [2021-05-02 13:35:34,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 13:35:34,381 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.36) internal successors, (59), 24 states have internal predecessors, (59), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 60 [2021-05-02 13:35:34,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:34,396 INFO L225 Difference]: With dead ends: 1985 [2021-05-02 13:35:34,396 INFO L226 Difference]: Without dead ends: 1315 [2021-05-02 13:35:34,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 2802.8ms TimeCoverageRelationStatistics Valid=1129, Invalid=2531, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 13:35:34,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2021-05-02 13:35:34,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1307. [2021-05-02 13:35:34,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1307 states, 1154 states have (on average 1.1195840554592722) internal successors, (1292), 1250 states have internal predecessors, (1292), 53 states have call successors, (53), 5 states have call predecessors, (53), 99 states have return successors, (99), 51 states have call predecessors, (99), 51 states have call successors, (99) [2021-05-02 13:35:34,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1307 states to 1307 states and 1444 transitions. [2021-05-02 13:35:34,676 INFO L78 Accepts]: Start accepts. Automaton has 1307 states and 1444 transitions. Word has length 60 [2021-05-02 13:35:34,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:34,676 INFO L480 AbstractCegarLoop]: Abstraction has 1307 states and 1444 transitions. [2021-05-02 13:35:34,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.36) internal successors, (59), 24 states have internal predecessors, (59), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:35:34,676 INFO L276 IsEmpty]: Start isEmpty. Operand 1307 states and 1444 transitions. [2021-05-02 13:35:34,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:35:34,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:34,684 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:34,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable194 [2021-05-02 13:35:34,884 INFO L428 AbstractCegarLoop]: === Iteration 112 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:34,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:34,884 INFO L82 PathProgramCache]: Analyzing trace with hash 476370573, now seen corresponding path program 102 times [2021-05-02 13:35:34,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:34,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124247863] [2021-05-02 13:35:34,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:34,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:34,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:34,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:34,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:35:34,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:34,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:35:34,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:35,303 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:35:35,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:35,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124247863] [2021-05-02 13:35:35,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124247863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:35,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840766587] [2021-05-02 13:35:35,304 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:35,363 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:35:35,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:35,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:35:35,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:35,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:35,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:36,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:36,075 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:35:36,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840766587] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:36,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:36,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 25 [2021-05-02 13:35:36,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307377142] [2021-05-02 13:35:36,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:35:36,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:36,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:35:36,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=399, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:35:36,076 INFO L87 Difference]: Start difference. First operand 1307 states and 1444 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:35:39,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:39,388 INFO L93 Difference]: Finished difference Result 1365 states and 1514 transitions. [2021-05-02 13:35:39,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 13:35:39,391 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 60 [2021-05-02 13:35:39,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:39,396 INFO L225 Difference]: With dead ends: 1365 [2021-05-02 13:35:39,396 INFO L226 Difference]: Without dead ends: 1320 [2021-05-02 13:35:39,404 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 3154.2ms TimeCoverageRelationStatistics Valid=1129, Invalid=2531, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 13:35:39,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-05-02 13:35:39,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1320. [2021-05-02 13:35:39,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1167 states have (on average 1.1182519280205656) internal successors, (1305), 1263 states have internal predecessors, (1305), 53 states have call successors, (53), 5 states have call predecessors, (53), 99 states have return successors, (99), 51 states have call predecessors, (99), 51 states have call successors, (99) [2021-05-02 13:35:39,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1457 transitions. [2021-05-02 13:35:39,676 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1457 transitions. Word has length 60 [2021-05-02 13:35:39,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:39,677 INFO L480 AbstractCegarLoop]: Abstraction has 1320 states and 1457 transitions. [2021-05-02 13:35:39,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:35:39,677 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1457 transitions. [2021-05-02 13:35:39,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:35:39,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:39,685 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:39,885 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable195,103 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:39,885 INFO L428 AbstractCegarLoop]: === Iteration 113 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:39,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:39,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1806167277, now seen corresponding path program 103 times [2021-05-02 13:35:39,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:39,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101949309] [2021-05-02 13:35:39,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:39,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:40,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:40,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:40,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:35:40,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:40,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:35:40,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:42,723 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:35:42,724 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:42,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101949309] [2021-05-02 13:35:42,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101949309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:42,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385087437] [2021-05-02 13:35:42,724 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:42,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:42,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 13:35:42,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:43,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:43,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:43,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:43,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:43,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:43,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:43,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:44,056 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:35:44,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385087437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:44,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:44,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 49 [2021-05-02 13:35:44,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487311878] [2021-05-02 13:35:44,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:35:44,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:44,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:35:44,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2247, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:35:44,058 INFO L87 Difference]: Start difference. First operand 1320 states and 1457 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:36:02,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:02,773 INFO L93 Difference]: Finished difference Result 1470 states and 1624 transitions. [2021-05-02 13:36:02,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 13:36:02,776 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:36:02,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:02,785 INFO L225 Difference]: With dead ends: 1470 [2021-05-02 13:36:02,785 INFO L226 Difference]: Without dead ends: 1464 [2021-05-02 13:36:02,794 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1062 ImplicationChecksByTransitivity, 8120.5ms TimeCoverageRelationStatistics Valid=301, Invalid=7709, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 13:36:02,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1464 states. [2021-05-02 13:36:03,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1464 to 1336. [2021-05-02 13:36:03,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1336 states, 1180 states have (on average 1.11864406779661) internal successors, (1320), 1278 states have internal predecessors, (1320), 54 states have call successors, (54), 5 states have call predecessors, (54), 101 states have return successors, (102), 52 states have call predecessors, (102), 52 states have call successors, (102) [2021-05-02 13:36:03,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1336 states to 1336 states and 1476 transitions. [2021-05-02 13:36:03,086 INFO L78 Accepts]: Start accepts. Automaton has 1336 states and 1476 transitions. Word has length 61 [2021-05-02 13:36:03,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:03,086 INFO L480 AbstractCegarLoop]: Abstraction has 1336 states and 1476 transitions. [2021-05-02 13:36:03,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:36:03,086 INFO L276 IsEmpty]: Start isEmpty. Operand 1336 states and 1476 transitions. [2021-05-02 13:36:03,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:36:03,095 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:03,095 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:03,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable196,104 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:36:03,306 INFO L428 AbstractCegarLoop]: === Iteration 114 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:03,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:03,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1360021805, now seen corresponding path program 104 times [2021-05-02 13:36:03,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:03,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976485443] [2021-05-02 13:36:03,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:36:03,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:03,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:36:03,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:03,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:36:03,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:04,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:36:04,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:06,210 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:36:06,210 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:36:06,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976485443] [2021-05-02 13:36:06,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976485443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:06,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800807111] [2021-05-02 13:36:06,210 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:36:06,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:36:06,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:36:06,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 13:36:06,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:36:06,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:06,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:07,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:07,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:07,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:07,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:07,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:08,090 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:36:08,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800807111] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:08,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:36:08,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 49 [2021-05-02 13:36:08,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24327785] [2021-05-02 13:36:08,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:36:08,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:36:08,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:36:08,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2243, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:36:08,091 INFO L87 Difference]: Start difference. First operand 1336 states and 1476 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:36:25,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:25,784 INFO L93 Difference]: Finished difference Result 1342 states and 1481 transitions. [2021-05-02 13:36:25,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 13:36:25,787 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:36:25,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:25,792 INFO L225 Difference]: With dead ends: 1342 [2021-05-02 13:36:25,792 INFO L226 Difference]: Without dead ends: 1320 [2021-05-02 13:36:25,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 8467.8ms TimeCoverageRelationStatistics Valid=303, Invalid=7353, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 13:36:25,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-05-02 13:36:26,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1320. [2021-05-02 13:36:26,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1167 states have (on average 1.1182519280205656) internal successors, (1305), 1263 states have internal predecessors, (1305), 53 states have call successors, (53), 5 states have call predecessors, (53), 99 states have return successors, (100), 51 states have call predecessors, (100), 51 states have call successors, (100) [2021-05-02 13:36:26,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1458 transitions. [2021-05-02 13:36:26,076 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1458 transitions. Word has length 61 [2021-05-02 13:36:26,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:26,076 INFO L480 AbstractCegarLoop]: Abstraction has 1320 states and 1458 transitions. [2021-05-02 13:36:26,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:36:26,076 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1458 transitions. [2021-05-02 13:36:26,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:36:26,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:26,084 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:26,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable199 [2021-05-02 13:36:26,285 INFO L428 AbstractCegarLoop]: === Iteration 115 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:26,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:26,285 INFO L82 PathProgramCache]: Analyzing trace with hash -165892883, now seen corresponding path program 105 times [2021-05-02 13:36:26,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:26,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444544300] [2021-05-02 13:36:26,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:36:26,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:26,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:36:26,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:26,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:36:26,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:27,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:36:27,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:28,854 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:36:28,855 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:36:28,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444544300] [2021-05-02 13:36:28,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444544300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:28,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473962669] [2021-05-02 13:36:28,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:36:28,914 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:36:28,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:36:28,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 13:36:28,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:36:29,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:29,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:30,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:30,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:30,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:30,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:30,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:30,760 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:36:30,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473962669] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:30,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:36:30,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 49 [2021-05-02 13:36:30,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21237745] [2021-05-02 13:36:30,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:36:30,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:36:30,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:36:30,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=2239, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:36:30,762 INFO L87 Difference]: Start difference. First operand 1320 states and 1458 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:36:45,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:45,082 INFO L93 Difference]: Finished difference Result 1326 states and 1463 transitions. [2021-05-02 13:36:45,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:36:45,086 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:36:45,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:45,091 INFO L225 Difference]: With dead ends: 1326 [2021-05-02 13:36:45,091 INFO L226 Difference]: Without dead ends: 1302 [2021-05-02 13:36:45,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 7583.3ms TimeCoverageRelationStatistics Valid=305, Invalid=7005, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 13:36:45,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1302 states. [2021-05-02 13:36:45,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1302 to 1302. [2021-05-02 13:36:45,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1302 states, 1152 states have (on average 1.1180555555555556) internal successors, (1288), 1246 states have internal predecessors, (1288), 52 states have call successors, (52), 5 states have call predecessors, (52), 97 states have return successors, (98), 50 states have call predecessors, (98), 50 states have call successors, (98) [2021-05-02 13:36:45,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1302 states to 1302 states and 1438 transitions. [2021-05-02 13:36:45,375 INFO L78 Accepts]: Start accepts. Automaton has 1302 states and 1438 transitions. Word has length 61 [2021-05-02 13:36:45,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:45,375 INFO L480 AbstractCegarLoop]: Abstraction has 1302 states and 1438 transitions. [2021-05-02 13:36:45,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:36:45,375 INFO L276 IsEmpty]: Start isEmpty. Operand 1302 states and 1438 transitions. [2021-05-02 13:36:45,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:36:45,382 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:45,382 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:45,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable202 [2021-05-02 13:36:45,583 INFO L428 AbstractCegarLoop]: === Iteration 116 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:45,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:45,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1490253523, now seen corresponding path program 106 times [2021-05-02 13:36:45,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:45,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174289647] [2021-05-02 13:36:45,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:36:45,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:45,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:36:45,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:45,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:36:45,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:46,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:36:46,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:48,096 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:36:48,097 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:36:48,097 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174289647] [2021-05-02 13:36:48,097 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174289647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:48,097 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471841689] [2021-05-02 13:36:48,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:36:48,153 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:36:48,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:36:48,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:36:48,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:36:49,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:49,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:50,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:50,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:50,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:50,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:50,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:50,383 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:36:50,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471841689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:50,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:36:50,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 49 [2021-05-02 13:36:50,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239764567] [2021-05-02 13:36:50,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:36:50,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:36:50,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:36:50,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=2235, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:36:50,385 INFO L87 Difference]: Start difference. First operand 1302 states and 1438 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:02,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:02,374 INFO L93 Difference]: Finished difference Result 1308 states and 1443 transitions. [2021-05-02 13:37:02,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:37:02,378 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:37:02,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:02,382 INFO L225 Difference]: With dead ends: 1308 [2021-05-02 13:37:02,382 INFO L226 Difference]: Without dead ends: 1282 [2021-05-02 13:37:02,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 7725.9ms TimeCoverageRelationStatistics Valid=307, Invalid=6665, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:37:02,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1282 states. [2021-05-02 13:37:02,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1282 to 1282. [2021-05-02 13:37:02,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1282 states, 1135 states have (on average 1.1180616740088105) internal successors, (1269), 1227 states have internal predecessors, (1269), 51 states have call successors, (51), 5 states have call predecessors, (51), 95 states have return successors, (96), 49 states have call predecessors, (96), 49 states have call successors, (96) [2021-05-02 13:37:02,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1282 states to 1282 states and 1416 transitions. [2021-05-02 13:37:02,651 INFO L78 Accepts]: Start accepts. Automaton has 1282 states and 1416 transitions. Word has length 61 [2021-05-02 13:37:02,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:02,651 INFO L480 AbstractCegarLoop]: Abstraction has 1282 states and 1416 transitions. [2021-05-02 13:37:02,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:02,651 INFO L276 IsEmpty]: Start isEmpty. Operand 1282 states and 1416 transitions. [2021-05-02 13:37:02,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:37:02,658 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:02,658 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:02,859 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable205,107 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:02,859 INFO L428 AbstractCegarLoop]: === Iteration 117 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:02,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:02,859 INFO L82 PathProgramCache]: Analyzing trace with hash 779054317, now seen corresponding path program 107 times [2021-05-02 13:37:02,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:02,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570723417] [2021-05-02 13:37:02,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:02,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:03,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:37:03,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:03,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:37:03,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:03,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:37:03,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:05,135 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:37:05,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:05,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570723417] [2021-05-02 13:37:05,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570723417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:05,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193595350] [2021-05-02 13:37:05,135 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:05,192 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:37:05,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:05,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 13:37:05,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:06,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:06,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:07,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:07,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:07,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:07,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:07,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:07,493 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:37:07,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193595350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:07,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:37:07,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 49 [2021-05-02 13:37:07,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850407867] [2021-05-02 13:37:07,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:37:07,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:07,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:37:07,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=2231, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:37:07,495 INFO L87 Difference]: Start difference. First operand 1282 states and 1416 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:17,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:17,562 INFO L93 Difference]: Finished difference Result 1288 states and 1421 transitions. [2021-05-02 13:37:17,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:37:17,567 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:37:17,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:17,574 INFO L225 Difference]: With dead ends: 1288 [2021-05-02 13:37:17,574 INFO L226 Difference]: Without dead ends: 1260 [2021-05-02 13:37:17,584 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 7233.6ms TimeCoverageRelationStatistics Valid=309, Invalid=6333, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:37:17,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1260 states. [2021-05-02 13:37:17,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1260 to 1260. [2021-05-02 13:37:17,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1260 states, 1116 states have (on average 1.118279569892473) internal successors, (1248), 1206 states have internal predecessors, (1248), 50 states have call successors, (50), 5 states have call predecessors, (50), 93 states have return successors, (94), 48 states have call predecessors, (94), 48 states have call successors, (94) [2021-05-02 13:37:17,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1260 states to 1260 states and 1392 transitions. [2021-05-02 13:37:17,857 INFO L78 Accepts]: Start accepts. Automaton has 1260 states and 1392 transitions. Word has length 61 [2021-05-02 13:37:17,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:17,858 INFO L480 AbstractCegarLoop]: Abstraction has 1260 states and 1392 transitions. [2021-05-02 13:37:17,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:17,858 INFO L276 IsEmpty]: Start isEmpty. Operand 1260 states and 1392 transitions. [2021-05-02 13:37:17,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:37:17,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:17,867 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:18,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208,108 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:18,068 INFO L428 AbstractCegarLoop]: === Iteration 118 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:18,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:18,069 INFO L82 PathProgramCache]: Analyzing trace with hash 896190765, now seen corresponding path program 108 times [2021-05-02 13:37:18,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:18,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034597844] [2021-05-02 13:37:18,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:18,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:18,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:37:18,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:18,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:37:18,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:18,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:37:18,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:19,885 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:37:19,885 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:19,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034597844] [2021-05-02 13:37:19,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034597844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:19,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942070504] [2021-05-02 13:37:19,885 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:19,943 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:37:19,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:19,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 13:37:19,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:20,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:20,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:22,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:22,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:22,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:22,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:22,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:22,225 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:37:22,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942070504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:22,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:37:22,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 49 [2021-05-02 13:37:22,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096691966] [2021-05-02 13:37:22,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:37:22,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:22,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:37:22,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2227, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:37:22,227 INFO L87 Difference]: Start difference. First operand 1260 states and 1392 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:30,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:30,052 INFO L93 Difference]: Finished difference Result 1266 states and 1397 transitions. [2021-05-02 13:37:30,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:37:30,055 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:37:30,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:30,060 INFO L225 Difference]: With dead ends: 1266 [2021-05-02 13:37:30,060 INFO L226 Difference]: Without dead ends: 1236 [2021-05-02 13:37:30,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 6666.8ms TimeCoverageRelationStatistics Valid=311, Invalid=6009, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 13:37:30,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1236 states. [2021-05-02 13:37:30,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1236 to 1236. [2021-05-02 13:37:30,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1236 states, 1095 states have (on average 1.1187214611872147) internal successors, (1225), 1183 states have internal predecessors, (1225), 49 states have call successors, (49), 5 states have call predecessors, (49), 91 states have return successors, (92), 47 states have call predecessors, (92), 47 states have call successors, (92) [2021-05-02 13:37:30,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1236 states to 1236 states and 1366 transitions. [2021-05-02 13:37:30,295 INFO L78 Accepts]: Start accepts. Automaton has 1236 states and 1366 transitions. Word has length 61 [2021-05-02 13:37:30,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:30,295 INFO L480 AbstractCegarLoop]: Abstraction has 1236 states and 1366 transitions. [2021-05-02 13:37:30,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:30,295 INFO L276 IsEmpty]: Start isEmpty. Operand 1236 states and 1366 transitions. [2021-05-02 13:37:30,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:37:30,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:30,324 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:30,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable211,109 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:30,525 INFO L428 AbstractCegarLoop]: === Iteration 119 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:30,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:30,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1063244563, now seen corresponding path program 109 times [2021-05-02 13:37:30,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:30,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107854175] [2021-05-02 13:37:30,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:30,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:30,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:37:30,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:30,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:37:30,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:31,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:37:31,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:32,396 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-05-02 13:37:32,396 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:32,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107854175] [2021-05-02 13:37:32,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107854175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:32,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407138924] [2021-05-02 13:37:32,396 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:32,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:32,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:37:32,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:33,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:33,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:35,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:35,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:35,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:35,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:35,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:35,468 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-05-02 13:37:35,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407138924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:35,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:37:35,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 49 [2021-05-02 13:37:35,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724630657] [2021-05-02 13:37:35,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:37:35,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:35,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:37:35,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=2223, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:37:35,469 INFO L87 Difference]: Start difference. First operand 1236 states and 1366 transitions. Second operand has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:42,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:42,145 INFO L93 Difference]: Finished difference Result 1254 states and 1387 transitions. [2021-05-02 13:37:42,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:37:42,148 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-05-02 13:37:42,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:42,155 INFO L225 Difference]: With dead ends: 1254 [2021-05-02 13:37:42,155 INFO L226 Difference]: Without dead ends: 1248 [2021-05-02 13:37:42,161 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 7221.7ms TimeCoverageRelationStatistics Valid=313, Invalid=5693, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:37:42,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1248 states. [2021-05-02 13:37:42,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1248 to 1246. [2021-05-02 13:37:42,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1246 states, 1102 states have (on average 1.1197822141560798) internal successors, (1234), 1192 states have internal predecessors, (1234), 50 states have call successors, (50), 5 states have call predecessors, (50), 93 states have return successors, (95), 48 states have call predecessors, (95), 48 states have call successors, (95) [2021-05-02 13:37:42,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1246 states to 1246 states and 1379 transitions. [2021-05-02 13:37:42,414 INFO L78 Accepts]: Start accepts. Automaton has 1246 states and 1379 transitions. Word has length 61 [2021-05-02 13:37:42,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:42,415 INFO L480 AbstractCegarLoop]: Abstraction has 1246 states and 1379 transitions. [2021-05-02 13:37:42,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 46 states have (on average 1.326086956521739) internal successors, (61), 43 states have internal predecessors, (61), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:37:42,415 INFO L276 IsEmpty]: Start isEmpty. Operand 1246 states and 1379 transitions. [2021-05-02 13:37:42,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:37:42,422 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:42,422 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:42,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable214 [2021-05-02 13:37:42,622 INFO L428 AbstractCegarLoop]: === Iteration 120 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:42,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:42,623 INFO L82 PathProgramCache]: Analyzing trace with hash -862861684, now seen corresponding path program 110 times [2021-05-02 13:37:42,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:42,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208784859] [2021-05-02 13:37:42,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:42,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:42,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:37:42,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:42,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:37:42,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:43,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:37:43,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:44,728 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:37:44,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:44,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208784859] [2021-05-02 13:37:44,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208784859] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:44,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867892351] [2021-05-02 13:37:44,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:44,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:37:44,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:44,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:37:44,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:44,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:44,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:45,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:46,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:47,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:48,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:49,480 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:37:49,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867892351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:49,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:37:49,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 33] total 63 [2021-05-02 13:37:49,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381210340] [2021-05-02 13:37:49,481 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 13:37:49,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:49,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 13:37:49,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3754, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 13:37:49,481 INFO L87 Difference]: Start difference. First operand 1246 states and 1379 transitions. Second operand has 63 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 62 states have internal predecessors, (90), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:38:03,203 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 43 [2021-05-02 13:38:07,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:07,381 INFO L93 Difference]: Finished difference Result 1392 states and 1550 transitions. [2021-05-02 13:38:07,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:38:07,385 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 62 states have internal predecessors, (90), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 62 [2021-05-02 13:38:07,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:07,399 INFO L225 Difference]: With dead ends: 1392 [2021-05-02 13:38:07,399 INFO L226 Difference]: Without dead ends: 1378 [2021-05-02 13:38:07,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 11042.9ms TimeCoverageRelationStatistics Valid=315, Invalid=8615, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:38:07,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1378 states. [2021-05-02 13:38:07,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1378 to 1369. [2021-05-02 13:38:07,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1369 states, 1210 states have (on average 1.1190082644628099) internal successors, (1354), 1310 states have internal predecessors, (1354), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (110), 53 states have call predecessors, (110), 53 states have call successors, (110) [2021-05-02 13:38:07,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1369 states to 1369 states and 1519 transitions. [2021-05-02 13:38:07,756 INFO L78 Accepts]: Start accepts. Automaton has 1369 states and 1519 transitions. Word has length 62 [2021-05-02 13:38:07,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:07,757 INFO L480 AbstractCegarLoop]: Abstraction has 1369 states and 1519 transitions. [2021-05-02 13:38:07,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 62 states have internal predecessors, (90), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:38:07,757 INFO L276 IsEmpty]: Start isEmpty. Operand 1369 states and 1519 transitions. [2021-05-02 13:38:07,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:38:07,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:07,765 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:07,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable217 [2021-05-02 13:38:07,966 INFO L428 AbstractCegarLoop]: === Iteration 121 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:07,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:07,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1466475567, now seen corresponding path program 111 times [2021-05-02 13:38:07,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:07,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643710808] [2021-05-02 13:38:07,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:07,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:08,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:38:08,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:08,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:38:08,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:08,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:38:08,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:10,270 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:38:10,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:10,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643710808] [2021-05-02 13:38:10,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643710808] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:10,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966240616] [2021-05-02 13:38:10,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:10,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 13:38:10,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:10,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:38:10,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:10,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:10,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:11,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:12,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:13,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:14,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:15,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:15,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:15,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:15,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:15,392 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:38:15,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966240616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:15,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:38:15,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 33] total 63 [2021-05-02 13:38:15,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194262436] [2021-05-02 13:38:15,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 13:38:15,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:15,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 13:38:15,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3754, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 13:38:15,394 INFO L87 Difference]: Start difference. First operand 1369 states and 1519 transitions. Second operand has 63 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 62 states have internal predecessors, (90), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:38:22,807 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 43 [2021-05-02 13:38:45,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:45,028 INFO L93 Difference]: Finished difference Result 1384 states and 1534 transitions. [2021-05-02 13:38:45,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:38:45,032 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 62 states have internal predecessors, (90), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 62 [2021-05-02 13:38:45,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:45,041 INFO L225 Difference]: With dead ends: 1384 [2021-05-02 13:38:45,041 INFO L226 Difference]: Without dead ends: 1372 [2021-05-02 13:38:45,049 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 11971.4ms TimeCoverageRelationStatistics Valid=315, Invalid=8615, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:38:45,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1372 states. [2021-05-02 13:38:45,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1372 to 1370. [2021-05-02 13:38:45,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1370 states, 1211 states have (on average 1.1189099917423617) internal successors, (1355), 1311 states have internal predecessors, (1355), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (104), 53 states have call predecessors, (104), 53 states have call successors, (104) [2021-05-02 13:38:45,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1370 states to 1370 states and 1514 transitions. [2021-05-02 13:38:45,339 INFO L78 Accepts]: Start accepts. Automaton has 1370 states and 1514 transitions. Word has length 62 [2021-05-02 13:38:45,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:45,339 INFO L480 AbstractCegarLoop]: Abstraction has 1370 states and 1514 transitions. [2021-05-02 13:38:45,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 62 states have internal predecessors, (90), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:38:45,340 INFO L276 IsEmpty]: Start isEmpty. Operand 1370 states and 1514 transitions. [2021-05-02 13:38:45,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:38:45,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:45,348 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:45,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable218 [2021-05-02 13:38:45,549 INFO L428 AbstractCegarLoop]: === Iteration 122 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:45,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:45,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1546673523, now seen corresponding path program 112 times [2021-05-02 13:38:45,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:45,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69358564] [2021-05-02 13:38:45,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:45,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:45,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:38:45,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:45,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:38:45,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:45,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:38:45,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:46,057 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:38:46,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:46,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69358564] [2021-05-02 13:38:46,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69358564] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:46,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364166419] [2021-05-02 13:38:46,057 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:46,107 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:38:46,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:46,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:38:46,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:46,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:46,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:47,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:47,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:47,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:47,095 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:38:47,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364166419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:47,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:38:47,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 27 [2021-05-02 13:38:47,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545770711] [2021-05-02 13:38:47,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:38:47,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:47,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:38:47,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:38:47,097 INFO L87 Difference]: Start difference. First operand 1370 states and 1514 transitions. Second operand has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:38:50,504 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 37 [2021-05-02 13:38:51,166 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 37 [2021-05-02 13:38:51,574 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2021-05-02 13:38:51,735 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:51,899 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:52,056 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:52,207 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:52,358 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:52,502 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:53,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:53,008 INFO L93 Difference]: Finished difference Result 1616 states and 1803 transitions. [2021-05-02 13:38:53,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:38:53,012 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 62 [2021-05-02 13:38:53,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:53,020 INFO L225 Difference]: With dead ends: 1616 [2021-05-02 13:38:53,020 INFO L226 Difference]: Without dead ends: 1554 [2021-05-02 13:38:53,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 5565.5ms TimeCoverageRelationStatistics Valid=1216, Invalid=3754, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 13:38:53,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1554 states. [2021-05-02 13:38:53,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1554 to 1512. [2021-05-02 13:38:53,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1512 states, 1353 states have (on average 1.1175166297117516) internal successors, (1512), 1453 states have internal predecessors, (1512), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (104), 53 states have call predecessors, (104), 53 states have call successors, (104) [2021-05-02 13:38:53,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1671 transitions. [2021-05-02 13:38:53,394 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1671 transitions. Word has length 62 [2021-05-02 13:38:53,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:53,395 INFO L480 AbstractCegarLoop]: Abstraction has 1512 states and 1671 transitions. [2021-05-02 13:38:53,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 13:38:53,395 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1671 transitions. [2021-05-02 13:38:53,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:38:53,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:53,405 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:53,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable219,113 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:53,606 INFO L428 AbstractCegarLoop]: === Iteration 123 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:53,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:53,606 INFO L82 PathProgramCache]: Analyzing trace with hash 494600014, now seen corresponding path program 113 times [2021-05-02 13:38:53,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:53,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055441456] [2021-05-02 13:38:53,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:53,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:53,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:38:53,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:53,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:38:53,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:54,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:38:54,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:38:54,098 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:38:54,098 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:54,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055441456] [2021-05-02 13:38:54,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055441456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:54,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336169379] [2021-05-02 13:38:54,098 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:54,155 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:38:54,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:54,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:38:54,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:54,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:54,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:55,095 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:38:55,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336169379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:55,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:38:55,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 27 [2021-05-02 13:38:55,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044543384] [2021-05-02 13:38:55,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:38:55,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:55,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:38:55,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:38:55,097 INFO L87 Difference]: Start difference. First operand 1512 states and 1671 transitions. Second operand has 27 states, 27 states have (on average 2.2962962962962963) internal successors, (62), 26 states have internal predecessors, (62), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:38:56,058 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2021-05-02 13:38:56,426 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 37 [2021-05-02 13:38:57,141 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2021-05-02 13:38:57,284 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 37 [2021-05-02 13:38:57,430 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 37 [2021-05-02 13:38:57,580 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2021-05-02 13:38:57,814 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2021-05-02 13:38:57,956 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 37 [2021-05-02 13:38:58,113 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2021-05-02 13:38:59,555 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:59,704 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:38:59,857 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:39:00,021 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36 [2021-05-02 13:39:01,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:01,115 INFO L93 Difference]: Finished difference Result 2555 states and 2807 transitions. [2021-05-02 13:39:01,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:39:01,118 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.2962962962962963) internal successors, (62), 26 states have internal predecessors, (62), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 62 [2021-05-02 13:39:01,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:01,143 INFO L225 Difference]: With dead ends: 2555 [2021-05-02 13:39:01,143 INFO L226 Difference]: Without dead ends: 1696 [2021-05-02 13:39:01,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 5640.9ms TimeCoverageRelationStatistics Valid=1216, Invalid=3754, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 13:39:01,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1696 states. [2021-05-02 13:39:01,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1696 to 1654. [2021-05-02 13:39:01,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1654 states, 1495 states have (on average 1.1163879598662207) internal successors, (1669), 1595 states have internal predecessors, (1669), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (104), 53 states have call predecessors, (104), 53 states have call successors, (104) [2021-05-02 13:39:01,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1654 states to 1654 states and 1828 transitions. [2021-05-02 13:39:01,544 INFO L78 Accepts]: Start accepts. Automaton has 1654 states and 1828 transitions. Word has length 62 [2021-05-02 13:39:01,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:01,545 INFO L480 AbstractCegarLoop]: Abstraction has 1654 states and 1828 transitions. [2021-05-02 13:39:01,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.2962962962962963) internal successors, (62), 26 states have internal predecessors, (62), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:39:01,545 INFO L276 IsEmpty]: Start isEmpty. Operand 1654 states and 1828 transitions. [2021-05-02 13:39:01,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:39:01,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:01,562 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:01,770 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable220,114 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:01,770 INFO L428 AbstractCegarLoop]: === Iteration 124 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:01,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:01,771 INFO L82 PathProgramCache]: Analyzing trace with hash 1491597194, now seen corresponding path program 114 times [2021-05-02 13:39:01,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:01,771 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164420369] [2021-05-02 13:39:01,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:01,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:02,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:39:02,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:02,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:39:02,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:03,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:39:03,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:06,255 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:39:06,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:06,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164420369] [2021-05-02 13:39:06,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164420369] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:06,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758776208] [2021-05-02 13:39:06,255 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:06,321 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-02 13:39:06,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:39:06,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 86 conjunts are in the unsatisfiable core [2021-05-02 13:39:06,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:06,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:06,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:07,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:07,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:07,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:07,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:07,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:08,053 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:39:08,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758776208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:08,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:39:08,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 51 [2021-05-02 13:39:08,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915932214] [2021-05-02 13:39:08,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:39:08,054 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:08,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:39:08,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2441, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:39:08,055 INFO L87 Difference]: Start difference. First operand 1654 states and 1828 transitions. Second operand has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:39:36,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:36,019 INFO L93 Difference]: Finished difference Result 1824 states and 2017 transitions. [2021-05-02 13:39:36,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:39:36,023 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 63 [2021-05-02 13:39:36,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:36,034 INFO L225 Difference]: With dead ends: 1824 [2021-05-02 13:39:36,034 INFO L226 Difference]: Without dead ends: 1818 [2021-05-02 13:39:36,045 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1157 ImplicationChecksByTransitivity, 11538.3ms TimeCoverageRelationStatistics Valid=313, Invalid=8429, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 13:39:36,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1818 states. [2021-05-02 13:39:36,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1818 to 1670. [2021-05-02 13:39:36,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1670 states, 1508 states have (on average 1.1167108753315649) internal successors, (1684), 1610 states have internal predecessors, (1684), 56 states have call successors, (56), 5 states have call predecessors, (56), 105 states have return successors, (107), 54 states have call predecessors, (107), 54 states have call successors, (107) [2021-05-02 13:39:36,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 1847 transitions. [2021-05-02 13:39:36,427 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 1847 transitions. Word has length 63 [2021-05-02 13:39:36,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:36,427 INFO L480 AbstractCegarLoop]: Abstraction has 1670 states and 1847 transitions. [2021-05-02 13:39:36,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:39:36,427 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 1847 transitions. [2021-05-02 13:39:36,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:39:36,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:36,438 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:36,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable221,115 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:36,640 INFO L428 AbstractCegarLoop]: === Iteration 125 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:36,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:36,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1845015914, now seen corresponding path program 115 times [2021-05-02 13:39:36,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:36,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172495474] [2021-05-02 13:39:36,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:36,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:36,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:39:36,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:36,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:39:36,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:38,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:39:38,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:40,383 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:39:40,383 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:40,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172495474] [2021-05-02 13:39:40,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172495474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:40,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405234468] [2021-05-02 13:39:40,384 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:40,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:39:40,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 13:39:40,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:41,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:41,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:42,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:42,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:42,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:42,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:42,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:42,707 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:39:42,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405234468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:42,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:39:42,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 51 [2021-05-02 13:39:42,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944025998] [2021-05-02 13:39:42,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:39:42,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:42,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:39:42,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=2437, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:39:42,709 INFO L87 Difference]: Start difference. First operand 1670 states and 1847 transitions. Second operand has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:40:08,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:40:08,257 INFO L93 Difference]: Finished difference Result 1676 states and 1852 transitions. [2021-05-02 13:40:08,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 13:40:08,263 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 63 [2021-05-02 13:40:08,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:40:08,305 INFO L225 Difference]: With dead ends: 1676 [2021-05-02 13:40:08,305 INFO L226 Difference]: Without dead ends: 1654 [2021-05-02 13:40:08,320 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1160 ImplicationChecksByTransitivity, 11151.7ms TimeCoverageRelationStatistics Valid=315, Invalid=8057, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 13:40:08,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-05-02 13:40:08,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1654. [2021-05-02 13:40:08,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1654 states, 1495 states have (on average 1.1163879598662207) internal successors, (1669), 1595 states have internal predecessors, (1669), 55 states have call successors, (55), 5 states have call predecessors, (55), 103 states have return successors, (105), 53 states have call predecessors, (105), 53 states have call successors, (105) [2021-05-02 13:40:08,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1654 states to 1654 states and 1829 transitions. [2021-05-02 13:40:08,738 INFO L78 Accepts]: Start accepts. Automaton has 1654 states and 1829 transitions. Word has length 63 [2021-05-02 13:40:08,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:40:08,738 INFO L480 AbstractCegarLoop]: Abstraction has 1654 states and 1829 transitions. [2021-05-02 13:40:08,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:40:08,738 INFO L276 IsEmpty]: Start isEmpty. Operand 1654 states and 1829 transitions. [2021-05-02 13:40:08,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:40:08,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:40:08,751 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:40:08,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable224 [2021-05-02 13:40:08,951 INFO L428 AbstractCegarLoop]: === Iteration 126 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:40:08,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:40:08,952 INFO L82 PathProgramCache]: Analyzing trace with hash 891221002, now seen corresponding path program 116 times [2021-05-02 13:40:08,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:40:08,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320625612] [2021-05-02 13:40:08,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:40:08,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:09,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:40:09,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:09,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:40:09,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:10,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:40:10,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:13,194 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:40:13,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:40:13,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320625612] [2021-05-02 13:40:13,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320625612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:40:13,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800962459] [2021-05-02 13:40:13,194 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:40:13,252 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:40:13,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:40:13,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-02 13:40:13,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:40:14,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:14,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:15,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:15,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:15,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:15,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:15,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:16,318 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:40:16,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800962459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:40:16,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:40:16,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 51 [2021-05-02 13:40:16,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700643664] [2021-05-02 13:40:16,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:40:16,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:40:16,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:40:16,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=2433, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:40:16,320 INFO L87 Difference]: Start difference. First operand 1654 states and 1829 transitions. Second operand has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:40:43,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:40:43,003 INFO L93 Difference]: Finished difference Result 1660 states and 1834 transitions. [2021-05-02 13:40:43,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 13:40:43,008 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 63 [2021-05-02 13:40:43,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:40:43,020 INFO L225 Difference]: With dead ends: 1660 [2021-05-02 13:40:43,020 INFO L226 Difference]: Without dead ends: 1636 [2021-05-02 13:40:43,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1160 ImplicationChecksByTransitivity, 12528.6ms TimeCoverageRelationStatistics Valid=317, Invalid=7693, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 13:40:43,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1636 states. [2021-05-02 13:40:43,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1636 to 1636. [2021-05-02 13:40:43,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1636 states, 1480 states have (on average 1.1162162162162161) internal successors, (1652), 1578 states have internal predecessors, (1652), 54 states have call successors, (54), 5 states have call predecessors, (54), 101 states have return successors, (103), 52 states have call predecessors, (103), 52 states have call successors, (103) [2021-05-02 13:40:43,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1636 states to 1636 states and 1809 transitions. [2021-05-02 13:40:43,415 INFO L78 Accepts]: Start accepts. Automaton has 1636 states and 1809 transitions. Word has length 63 [2021-05-02 13:40:43,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:40:43,415 INFO L480 AbstractCegarLoop]: Abstraction has 1636 states and 1809 transitions. [2021-05-02 13:40:43,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:40:43,415 INFO L276 IsEmpty]: Start isEmpty. Operand 1636 states and 1809 transitions. [2021-05-02 13:40:43,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:40:43,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:40:43,427 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:40:43,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable227,117 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:40:43,627 INFO L428 AbstractCegarLoop]: === Iteration 127 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:40:43,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:40:43,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1351141142, now seen corresponding path program 117 times [2021-05-02 13:40:43,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:40:43,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134668837] [2021-05-02 13:40:43,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:40:43,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:43,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:40:43,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:43,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 13:40:43,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:45,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:40:45,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:40:47,591 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:40:47,592 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:40:47,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134668837] [2021-05-02 13:40:47,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134668837] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:40:47,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841091786] [2021-05-02 13:40:47,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:40:47,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:40:47,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:40:47,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 13:40:47,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:40:48,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:48,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:50,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:50,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:50,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:50,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:50,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:40:50,960 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:40:50,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841091786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:40:50,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:40:50,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 51 [2021-05-02 13:40:50,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917111553] [2021-05-02 13:40:50,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:40:50,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:40:50,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:40:50,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=2429, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:40:50,962 INFO L87 Difference]: Start difference. First operand 1636 states and 1809 transitions. Second operand has 51 states, 48 states have (on average 1.3125) internal successors, (63), 45 states have internal predecessors, (63), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4)