/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/nested5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 00:47:42,415 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 00:47:42,418 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 00:47:42,446 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 00:47:42,469 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 00:47:42,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 00:47:42,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 00:47:42,472 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 00:47:42,474 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 00:47:42,474 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 00:47:42,476 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 00:47:42,480 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 00:47:42,481 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 00:47:42,483 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 00:47:42,484 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 00:47:42,485 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 00:47:42,490 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 00:47:42,495 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 00:47:42,496 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 00:47:42,496 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 00:47:42,499 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 [2021-05-06 00:47:42,529 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 00:47:42,530 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 00:47:42,532 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 00:47:42,532 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 00:47:42,532 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 00:47:42,532 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 00:47:42,532 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 00:47:42,532 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 00:47:42,532 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 00:47:42,532 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 00:47:42,533 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 00:47:42,533 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 00:47:42,533 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 00:47:42,533 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 00:47:42,533 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 00:47:42,534 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 00:47:42,534 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 00:47:42,534 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 00:47:42,534 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 00:47:42,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 00:47:42,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 00:47:42,534 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 00:47:42,534 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 00:47:42,535 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 00:47:42,535 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 00:47:42,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 00:47:42,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 00:47:42,535 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 00:47:42,535 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 00:47:42,781 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 00:47:42,796 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 00:47:42,797 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 00:47:42,798 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 00:47:42,799 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 00:47:42,799 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2021-05-06 00:47:42,846 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf4aa8f82/2e2f304485914626b2ed49d40f4a7c3b/FLAG901cd46f3 [2021-05-06 00:47:43,139 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 00:47:43,139 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-2.c [2021-05-06 00:47:43,143 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf4aa8f82/2e2f304485914626b2ed49d40f4a7c3b/FLAG901cd46f3 [2021-05-06 00:47:43,579 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf4aa8f82/2e2f304485914626b2ed49d40f4a7c3b [2021-05-06 00:47:43,581 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 00:47:43,582 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 00:47:43,585 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 00:47:43,585 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 00:47:43,587 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 00:47:43,588 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,589 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5acb313a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43, skipping insertion in model container [2021-05-06 00:47:43,589 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,593 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 00:47:43,601 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 00:47:43,672 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/nested5-2.c[321,334] [2021-05-06 00:47:43,680 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 00:47:43,685 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 00:47:43,692 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/nested5-2.c[321,334] [2021-05-06 00:47:43,695 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 00:47:43,703 INFO L208 MainTranslator]: Completed translation [2021-05-06 00:47:43,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43 WrapperNode [2021-05-06 00:47:43,703 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 00:47:43,704 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 00:47:43,704 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 00:47:43,704 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 00:47:43,715 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,716 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,750 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,750 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,753 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,755 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,756 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... [2021-05-06 00:47:43,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 00:47:43,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 00:47:43,757 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 00:47:43,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 00:47:43,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 00:47:43,808 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 00:47:43,808 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 00:47:43,809 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 00:47:43,809 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 00:47:43,809 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 00:47:43,809 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 00:47:43,809 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 00:47:43,809 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 00:47:43,809 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 00:47:43,809 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 00:47:43,810 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 00:47:44,013 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 00:47:44,013 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-06 00:47:44,014 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:47:44 BoogieIcfgContainer [2021-05-06 00:47:44,014 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 00:47:44,015 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 00:47:44,015 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 00:47:44,017 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 00:47:44,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:47:43" (1/3) ... [2021-05-06 00:47:44,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d9bd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:47:44, skipping insertion in model container [2021-05-06 00:47:44,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:47:43" (2/3) ... [2021-05-06 00:47:44,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d9bd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:47:44, skipping insertion in model container [2021-05-06 00:47:44,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:47:44" (3/3) ... [2021-05-06 00:47:44,018 INFO L111 eAbstractionObserver]: Analyzing ICFG nested5-2.c [2021-05-06 00:47:44,022 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 00:47:44,024 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 00:47:44,034 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 00:47:44,057 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 00:47:44,057 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 00:47:44,057 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 00:47:44,057 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 00:47:44,057 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 00:47:44,057 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 00:47:44,057 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 00:47:44,057 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 00:47:44,088 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:47:44,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 00:47:44,091 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:44,092 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:44,092 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:44,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:44,095 INFO L82 PathProgramCache]: Analyzing trace with hash -531959740, now seen corresponding path program 1 times [2021-05-06 00:47:44,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:44,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684101969] [2021-05-06 00:47:44,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:44,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:44,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:44,296 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:44,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684101969] [2021-05-06 00:47:44,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684101969] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:47:44,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 00:47:44,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 00:47:44,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623571466] [2021-05-06 00:47:44,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 00:47:44,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:44,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 00:47:44,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 00:47:44,309 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:44,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:44,341 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2021-05-06 00:47:44,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 00:47:44,342 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2021-05-06 00:47:44,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:44,346 INFO L225 Difference]: With dead ends: 50 [2021-05-06 00:47:44,346 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 00:47:44,347 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 00:47:44,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 00:47:44,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 00:47:44,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:44,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-06 00:47:44,380 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2021-05-06 00:47:44,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:44,380 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-06 00:47:44,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:44,382 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-06 00:47:44,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 00:47:44,382 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:44,382 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:44,383 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 00:47:44,383 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:44,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:44,384 INFO L82 PathProgramCache]: Analyzing trace with hash -537500866, now seen corresponding path program 1 times [2021-05-06 00:47:44,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:44,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931911849] [2021-05-06 00:47:44,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:44,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:44,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:44,495 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:44,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931911849] [2021-05-06 00:47:44,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931911849] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:47:44,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 00:47:44,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 00:47:44,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080128291] [2021-05-06 00:47:44,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 00:47:44,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:44,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 00:47:44,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 00:47:44,498 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:44,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:44,587 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2021-05-06 00:47:44,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 00:47:44,588 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2021-05-06 00:47:44,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:44,589 INFO L225 Difference]: With dead ends: 49 [2021-05-06 00:47:44,589 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 00:47:44,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 00:47:44,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 00:47:44,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-05-06 00:47:44,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:44,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-06 00:47:44,604 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 15 [2021-05-06 00:47:44,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:44,605 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-06 00:47:44,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:44,606 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-06 00:47:44,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 00:47:44,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:44,607 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:44,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 00:47:44,607 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:44,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:44,607 INFO L82 PathProgramCache]: Analyzing trace with hash -509289700, now seen corresponding path program 1 times [2021-05-06 00:47:44,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:44,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048401344] [2021-05-06 00:47:44,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:44,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:44,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:44,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:44,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048401344] [2021-05-06 00:47:44,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048401344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:44,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439015447] [2021-05-06 00:47:44,727 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 [2021-05-06 00:47:44,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:44,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 00:47:44,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:44,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:44,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439015447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:44,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:44,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-06 00:47:44,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642460760] [2021-05-06 00:47:44,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 00:47:44,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:44,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 00:47:44,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 00:47:44,847 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:44,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:44,982 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2021-05-06 00:47:44,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 00:47:44,982 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 00:47:44,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:44,983 INFO L225 Difference]: With dead ends: 52 [2021-05-06 00:47:44,983 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 00:47:44,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 76.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 00:47:44,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 00:47:44,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-05-06 00:47:44,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:44,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-06 00:47:44,987 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-05-06 00:47:44,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:44,987 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-06 00:47:44,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:44,987 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-06 00:47:44,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 00:47:44,988 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:44,988 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:45,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 00:47:45,188 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:45,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:45,189 INFO L82 PathProgramCache]: Analyzing trace with hash 831837050, now seen corresponding path program 2 times [2021-05-06 00:47:45,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:45,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525869006] [2021-05-06 00:47:45,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:45,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:45,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:45,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:45,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:45,265 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:45,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525869006] [2021-05-06 00:47:45,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525869006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:45,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186937614] [2021-05-06 00:47:45,266 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 [2021-05-06 00:47:45,315 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:47:45,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:45,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 00:47:45,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:45,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:45,395 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:45,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186937614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:45,395 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:45,395 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 00:47:45,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689900049] [2021-05-06 00:47:45,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 00:47:45,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:45,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 00:47:45,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 00:47:45,396 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:45,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:45,519 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2021-05-06 00:47:45,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 00:47:45,519 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 00:47:45,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:45,520 INFO L225 Difference]: With dead ends: 56 [2021-05-06 00:47:45,520 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 00:47:45,520 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 90.3ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-06 00:47:45,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 00:47:45,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2021-05-06 00:47:45,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:45,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-06 00:47:45,524 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2021-05-06 00:47:45,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:45,524 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-06 00:47:45,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:45,525 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-06 00:47:45,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 00:47:45,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:45,525 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:45,736 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:45,737 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:45,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:45,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1164455000, now seen corresponding path program 3 times [2021-05-06 00:47:45,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:45,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227259301] [2021-05-06 00:47:45,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:45,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:45,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:45,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:45,806 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:45,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:45,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227259301] [2021-05-06 00:47:45,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227259301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:45,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304518796] [2021-05-06 00:47:45,806 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 [2021-05-06 00:47:45,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 00:47:45,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:45,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 00:47:45,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:45,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:45,909 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:45,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304518796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:45,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:45,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-06 00:47:45,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073342269] [2021-05-06 00:47:45,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 00:47:45,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:45,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 00:47:45,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 00:47:45,910 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:46,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:46,089 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2021-05-06 00:47:46,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 00:47:46,090 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 00:47:46,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:46,092 INFO L225 Difference]: With dead ends: 60 [2021-05-06 00:47:46,092 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 00:47:46,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 123.1ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-06 00:47:46,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 00:47:46,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-05-06 00:47:46,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:46,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-06 00:47:46,104 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 21 [2021-05-06 00:47:46,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:46,104 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-06 00:47:46,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:46,104 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-06 00:47:46,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 00:47:46,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:46,105 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:46,309 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:46,310 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:46,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:46,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1312242250, now seen corresponding path program 4 times [2021-05-06 00:47:46,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:46,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857878010] [2021-05-06 00:47:46,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:46,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:46,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:46,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:46,389 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:46,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:46,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857878010] [2021-05-06 00:47:46,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857878010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:46,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651579378] [2021-05-06 00:47:46,390 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 [2021-05-06 00:47:46,435 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:47:46,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:46,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 00:47:46,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:46,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:46,507 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:46,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651579378] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:46,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:46,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-06 00:47:46,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221966882] [2021-05-06 00:47:46,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 00:47:46,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:46,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 00:47:46,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 00:47:46,509 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:46,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:46,692 INFO L93 Difference]: Finished difference Result 64 states and 76 transitions. [2021-05-06 00:47:46,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 00:47:46,693 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 00:47:46,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:46,694 INFO L225 Difference]: With dead ends: 64 [2021-05-06 00:47:46,694 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 00:47:46,694 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 144.9ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-06 00:47:46,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 00:47:46,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2021-05-06 00:47:46,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:46,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-06 00:47:46,703 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2021-05-06 00:47:46,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:46,704 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-06 00:47:46,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:46,704 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-06 00:47:46,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 00:47:46,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:46,704 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:46,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:46,923 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:46,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:46,923 INFO L82 PathProgramCache]: Analyzing trace with hash -2006417516, now seen corresponding path program 5 times [2021-05-06 00:47:46,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:46,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20202402] [2021-05-06 00:47:46,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:46,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:47,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:47,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:47,037 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:47,039 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:47,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20202402] [2021-05-06 00:47:47,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20202402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:47,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076641244] [2021-05-06 00:47:47,039 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 [2021-05-06 00:47:47,092 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 00:47:47,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:47,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 00:47:47,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:47,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:47,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076641244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:47,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:47,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-06 00:47:47,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006282417] [2021-05-06 00:47:47,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 00:47:47,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:47,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 00:47:47,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 00:47:47,178 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:47,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:47,379 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-05-06 00:47:47,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 00:47:47,380 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-06 00:47:47,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:47,380 INFO L225 Difference]: With dead ends: 68 [2021-05-06 00:47:47,380 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 00:47:47,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 184.0ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-06 00:47:47,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 00:47:47,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2021-05-06 00:47:47,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:47,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-06 00:47:47,384 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 25 [2021-05-06 00:47:47,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:47,384 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-06 00:47:47,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:47,385 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-06 00:47:47,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 00:47:47,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:47,385 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:47,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 00:47:47,601 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:47,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:47,601 INFO L82 PathProgramCache]: Analyzing trace with hash 906050034, now seen corresponding path program 6 times [2021-05-06 00:47:47,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:47,602 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154194237] [2021-05-06 00:47:47,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:47,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:47,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:47,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:47,697 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:47,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:47,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154194237] [2021-05-06 00:47:47,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154194237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:47,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452580828] [2021-05-06 00:47:47,698 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 [2021-05-06 00:47:47,783 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 00:47:47,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:47,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 00:47:47,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:47,862 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:47,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452580828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:47,863 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:47,863 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 00:47:47,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020113691] [2021-05-06 00:47:47,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 00:47:47,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:47,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 00:47:47,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 00:47:47,865 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:48,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:48,149 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2021-05-06 00:47:48,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 00:47:48,149 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-06 00:47:48,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:48,150 INFO L225 Difference]: With dead ends: 72 [2021-05-06 00:47:48,150 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 00:47:48,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 219.9ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 00:47:48,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 00:47:48,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-06 00:47:48,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:48,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-05-06 00:47:48,153 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2021-05-06 00:47:48,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:48,154 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-05-06 00:47:48,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:48,154 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-05-06 00:47:48,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 00:47:48,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:48,154 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:48,370 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:48,371 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:48,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:48,371 INFO L82 PathProgramCache]: Analyzing trace with hash -531311408, now seen corresponding path program 7 times [2021-05-06 00:47:48,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:48,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153740286] [2021-05-06 00:47:48,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:48,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:48,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:48,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:48,480 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:48,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:48,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153740286] [2021-05-06 00:47:48,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153740286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:48,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241304539] [2021-05-06 00:47:48,480 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 [2021-05-06 00:47:48,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:48,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 00:47:48,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:48,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:48,605 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:48,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241304539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:48,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:48,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-06 00:47:48,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417373870] [2021-05-06 00:47:48,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 00:47:48,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:48,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 00:47:48,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 00:47:48,609 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:48,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:48,953 INFO L93 Difference]: Finished difference Result 76 states and 88 transitions. [2021-05-06 00:47:48,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 00:47:48,953 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 00:47:48,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:48,954 INFO L225 Difference]: With dead ends: 76 [2021-05-06 00:47:48,954 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 00:47:48,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 257.4ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-06 00:47:48,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 00:47:48,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-05-06 00:47:48,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.15625) internal successors, (37), 32 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:48,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-06 00:47:48,958 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2021-05-06 00:47:48,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:48,958 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-06 00:47:48,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:48,958 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-06 00:47:48,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 00:47:48,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:48,959 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:49,187 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:49,187 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:49,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:49,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1143812142, now seen corresponding path program 8 times [2021-05-06 00:47:49,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:49,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952164911] [2021-05-06 00:47:49,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:49,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:49,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:49,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:49,291 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:49,291 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:49,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952164911] [2021-05-06 00:47:49,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952164911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:49,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911504721] [2021-05-06 00:47:49,291 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 [2021-05-06 00:47:49,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:47:49,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:49,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 00:47:49,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:49,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:49,421 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:49,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911504721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:49,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:49,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-06 00:47:49,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928632767] [2021-05-06 00:47:49,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 00:47:49,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:49,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 00:47:49,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 00:47:49,422 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:49,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:49,761 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2021-05-06 00:47:49,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 00:47:49,761 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-06 00:47:49,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:49,762 INFO L225 Difference]: With dead ends: 80 [2021-05-06 00:47:49,762 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 00:47:49,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 259.5ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 00:47:49,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 00:47:49,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-05-06 00:47:49,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:49,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-05-06 00:47:49,766 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 31 [2021-05-06 00:47:49,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:49,766 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-05-06 00:47:49,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:49,766 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-05-06 00:47:49,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 00:47:49,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:49,767 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:49,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 00:47:49,981 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:49,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:49,981 INFO L82 PathProgramCache]: Analyzing trace with hash 324807692, now seen corresponding path program 9 times [2021-05-06 00:47:49,981 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:49,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60013112] [2021-05-06 00:47:49,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:49,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:50,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:50,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:50,092 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:50,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:50,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60013112] [2021-05-06 00:47:50,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60013112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:50,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986456403] [2021-05-06 00:47:50,092 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 [2021-05-06 00:47:50,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 00:47:50,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:50,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-06 00:47:50,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:50,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:50,268 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:50,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986456403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:50,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:50,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 00:47:50,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447970452] [2021-05-06 00:47:50,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 00:47:50,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:50,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 00:47:50,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 00:47:50,269 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:50,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:50,626 INFO L93 Difference]: Finished difference Result 84 states and 96 transitions. [2021-05-06 00:47:50,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 00:47:50,626 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 00:47:50,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:50,627 INFO L225 Difference]: With dead ends: 84 [2021-05-06 00:47:50,627 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 00:47:50,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 295.1ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 00:47:50,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 00:47:50,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-06 00:47:50,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:50,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-06 00:47:50,630 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2021-05-06 00:47:50,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:50,631 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-06 00:47:50,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:50,631 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-06 00:47:50,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 00:47:50,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:50,631 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:50,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:50,837 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:50,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:50,837 INFO L82 PathProgramCache]: Analyzing trace with hash -759453590, now seen corresponding path program 10 times [2021-05-06 00:47:50,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:50,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988452578] [2021-05-06 00:47:50,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:50,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:50,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:50,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:50,984 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:50,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:50,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988452578] [2021-05-06 00:47:50,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988452578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:50,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107018271] [2021-05-06 00:47:50,984 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 [2021-05-06 00:47:51,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:47:51,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:51,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 00:47:51,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:51,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:51,102 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:51,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107018271] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:51,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:51,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-06 00:47:51,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51240530] [2021-05-06 00:47:51,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 00:47:51,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:51,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 00:47:51,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-06 00:47:51,103 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:51,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:51,589 INFO L93 Difference]: Finished difference Result 88 states and 100 transitions. [2021-05-06 00:47:51,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 00:47:51,589 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 00:47:51,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:51,590 INFO L225 Difference]: With dead ends: 88 [2021-05-06 00:47:51,590 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 00:47:51,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 352.7ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 00:47:51,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 00:47:51,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 44. [2021-05-06 00:47:51,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:51,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-06 00:47:51,594 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 35 [2021-05-06 00:47:51,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:51,595 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-06 00:47:51,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:51,595 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-06 00:47:51,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 00:47:51,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:51,595 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:51,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:51,801 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:51,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:51,801 INFO L82 PathProgramCache]: Analyzing trace with hash 942507336, now seen corresponding path program 11 times [2021-05-06 00:47:51,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:51,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924859895] [2021-05-06 00:47:51,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:51,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:51,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:51,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:51,949 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:51,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:51,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924859895] [2021-05-06 00:47:51,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924859895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:51,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507488611] [2021-05-06 00:47:51,949 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 [2021-05-06 00:47:52,039 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 00:47:52,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:52,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 00:47:52,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:52,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:52,154 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:52,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507488611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:52,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:52,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-06 00:47:52,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446975179] [2021-05-06 00:47:52,154 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 00:47:52,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:52,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 00:47:52,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 00:47:52,155 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:52,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:52,668 INFO L93 Difference]: Finished difference Result 92 states and 104 transitions. [2021-05-06 00:47:52,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 00:47:52,668 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-06 00:47:52,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:52,669 INFO L225 Difference]: With dead ends: 92 [2021-05-06 00:47:52,669 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 00:47:52,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 423.9ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-06 00:47:52,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 00:47:52,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-06 00:47:52,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.125) internal successors, (45), 40 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:52,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-06 00:47:52,672 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 37 [2021-05-06 00:47:52,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:52,673 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-06 00:47:52,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:52,673 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-06 00:47:52,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 00:47:52,673 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:52,673 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:52,889 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 00:47:52,889 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:52,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:52,889 INFO L82 PathProgramCache]: Analyzing trace with hash 144417446, now seen corresponding path program 12 times [2021-05-06 00:47:52,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:52,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162913121] [2021-05-06 00:47:52,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:52,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:53,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,066 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:53,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:53,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162913121] [2021-05-06 00:47:53,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162913121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:53,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730943056] [2021-05-06 00:47:53,067 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 [2021-05-06 00:47:53,196 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-06 00:47:53,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:53,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 00:47:53,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:53,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:53,311 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:53,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730943056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:53,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:53,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-06 00:47:53,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298175439] [2021-05-06 00:47:53,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 00:47:53,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:53,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 00:47:53,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 00:47:53,313 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:53,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:53,866 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2021-05-06 00:47:53,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 00:47:53,867 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-06 00:47:53,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:53,867 INFO L225 Difference]: With dead ends: 96 [2021-05-06 00:47:53,867 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 00:47:53,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 465.7ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-06 00:47:53,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 00:47:53,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 48. [2021-05-06 00:47:53,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 42 states have (on average 1.119047619047619) internal successors, (47), 42 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:53,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2021-05-06 00:47:53,871 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2021-05-06 00:47:53,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:53,871 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2021-05-06 00:47:53,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:53,871 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2021-05-06 00:47:53,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 00:47:53,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:53,872 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:54,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 00:47:54,081 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:54,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:54,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1979179140, now seen corresponding path program 13 times [2021-05-06 00:47:54,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:54,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366469980] [2021-05-06 00:47:54,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:54,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:54,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:54,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:54,270 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:54,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:54,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366469980] [2021-05-06 00:47:54,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366469980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:54,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597031759] [2021-05-06 00:47:54,270 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 [2021-05-06 00:47:54,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:54,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 00:47:54,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:54,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:54,408 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:54,408 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597031759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:54,408 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:54,408 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-06 00:47:54,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345025666] [2021-05-06 00:47:54,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 00:47:54,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:54,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 00:47:54,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 00:47:54,410 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:55,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:55,005 INFO L93 Difference]: Finished difference Result 100 states and 112 transitions. [2021-05-06 00:47:55,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 00:47:55,006 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 00:47:55,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:55,006 INFO L225 Difference]: With dead ends: 100 [2021-05-06 00:47:55,006 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 00:47:55,008 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 465.3ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 00:47:55,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 00:47:55,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2021-05-06 00:47:55,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:55,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-05-06 00:47:55,016 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 41 [2021-05-06 00:47:55,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:55,016 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-05-06 00:47:55,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:55,016 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-05-06 00:47:55,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 00:47:55,018 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:55,018 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:55,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 00:47:55,225 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:55,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:55,225 INFO L82 PathProgramCache]: Analyzing trace with hash -46391582, now seen corresponding path program 14 times [2021-05-06 00:47:55,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:55,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171420970] [2021-05-06 00:47:55,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:55,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:55,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:55,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:55,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:55,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171420970] [2021-05-06 00:47:55,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171420970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:55,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990278170] [2021-05-06 00:47:55,414 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 [2021-05-06 00:47:55,458 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:47:55,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:55,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 00:47:55,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:55,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:55,529 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:55,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990278170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:55,529 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:55,530 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-06 00:47:55,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596786114] [2021-05-06 00:47:55,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 00:47:55,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:55,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 00:47:55,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-06 00:47:55,530 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:56,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:56,201 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2021-05-06 00:47:56,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 00:47:56,201 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-06 00:47:56,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:56,202 INFO L225 Difference]: With dead ends: 104 [2021-05-06 00:47:56,202 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 00:47:56,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 497.4ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:47:56,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 00:47:56,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 52. [2021-05-06 00:47:56,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:56,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-06 00:47:56,205 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 43 [2021-05-06 00:47:56,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:56,205 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-06 00:47:56,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 18 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:56,205 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-06 00:47:56,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 00:47:56,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:56,206 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:56,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:56,417 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:56,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:56,417 INFO L82 PathProgramCache]: Analyzing trace with hash -999670336, now seen corresponding path program 15 times [2021-05-06 00:47:56,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:56,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597520951] [2021-05-06 00:47:56,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:56,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:56,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:56,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:56,629 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:56,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:56,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597520951] [2021-05-06 00:47:56,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597520951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:56,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812630846] [2021-05-06 00:47:56,629 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 [2021-05-06 00:47:56,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-06 00:47:56,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:56,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 00:47:56,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:56,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:56,867 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:56,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812630846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:56,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:56,867 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-06 00:47:56,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084033354] [2021-05-06 00:47:56,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 00:47:56,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:56,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 00:47:56,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 00:47:56,868 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:57,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:57,621 INFO L93 Difference]: Finished difference Result 108 states and 120 transitions. [2021-05-06 00:47:57,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 00:47:57,621 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-06 00:47:57,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:57,621 INFO L225 Difference]: With dead ends: 108 [2021-05-06 00:47:57,621 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 00:47:57,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 561.8ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 00:47:57,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 00:47:57,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 54. [2021-05-06 00:47:57,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:57,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-05-06 00:47:57,625 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 45 [2021-05-06 00:47:57,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:57,625 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-05-06 00:47:57,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:57,625 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-05-06 00:47:57,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 00:47:57,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:57,626 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:57,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 00:47:57,829 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:57,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:57,829 INFO L82 PathProgramCache]: Analyzing trace with hash 2022448414, now seen corresponding path program 16 times [2021-05-06 00:47:57,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:57,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293089018] [2021-05-06 00:47:57,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:57,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:58,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:58,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:58,048 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:58,048 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:58,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293089018] [2021-05-06 00:47:58,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293089018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:58,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142082881] [2021-05-06 00:47:58,049 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 [2021-05-06 00:47:58,088 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:47:58,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:58,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-06 00:47:58,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:58,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:58,195 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:58,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142082881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:58,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:58,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-06 00:47:58,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230886526] [2021-05-06 00:47:58,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 00:47:58,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:58,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 00:47:58,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-06 00:47:58,196 INFO L87 Difference]: Start difference. First operand 54 states and 58 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:58,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:58,919 INFO L93 Difference]: Finished difference Result 112 states and 124 transitions. [2021-05-06 00:47:58,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 00:47:58,919 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 00:47:58,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:58,920 INFO L225 Difference]: With dead ends: 112 [2021-05-06 00:47:58,920 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 00:47:58,920 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 591.2ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 00:47:58,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 00:47:58,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2021-05-06 00:47:58,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 50 states have (on average 1.1) internal successors, (55), 50 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:47:58,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-05-06 00:47:58,923 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 47 [2021-05-06 00:47:58,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:58,923 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-05-06 00:47:58,924 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:47:58,924 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-05-06 00:47:58,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 00:47:58,924 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:58,924 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:59,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 00:47:59,129 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:59,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:59,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1414292228, now seen corresponding path program 17 times [2021-05-06 00:47:59,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:59,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826423062] [2021-05-06 00:47:59,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:59,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:59,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:59,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:59,369 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:59,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:59,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826423062] [2021-05-06 00:47:59,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826423062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:59,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980336319] [2021-05-06 00:47:59,369 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 [2021-05-06 00:47:59,641 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-06 00:47:59,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:59,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 00:47:59,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:59,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:59,811 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:47:59,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1980336319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:59,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:59,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-06 00:47:59,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629639403] [2021-05-06 00:47:59,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 00:47:59,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:59,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 00:47:59,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-06 00:47:59,813 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:00,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:00,585 INFO L93 Difference]: Finished difference Result 116 states and 128 transitions. [2021-05-06 00:48:00,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 00:48:00,585 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 00:48:00,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:00,586 INFO L225 Difference]: With dead ends: 116 [2021-05-06 00:48:00,586 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 00:48:00,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 42 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 705.6ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 00:48:00,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 00:48:00,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 58. [2021-05-06 00:48:00,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:00,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-06 00:48:00,589 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 49 [2021-05-06 00:48:00,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:00,589 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-06 00:48:00,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:00,589 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-06 00:48:00,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 00:48:00,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:00,590 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:00,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:00,793 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:00,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:00,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1292198566, now seen corresponding path program 18 times [2021-05-06 00:48:00,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:00,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276034239] [2021-05-06 00:48:00,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:00,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:01,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:01,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:01,073 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:01,073 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:01,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276034239] [2021-05-06 00:48:01,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [276034239] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:01,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587086090] [2021-05-06 00:48:01,073 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 [2021-05-06 00:48:01,306 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-06 00:48:01,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:01,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-06 00:48:01,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:01,397 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:01,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587086090] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:01,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:01,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-06 00:48:01,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362092123] [2021-05-06 00:48:01,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 00:48:01,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:01,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 00:48:01,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 00:48:01,399 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:02,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:02,274 INFO L93 Difference]: Finished difference Result 120 states and 132 transitions. [2021-05-06 00:48:02,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 00:48:02,274 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), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 00:48:02,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:02,275 INFO L225 Difference]: With dead ends: 120 [2021-05-06 00:48:02,275 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 00:48:02,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 695.5ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 00:48:02,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 00:48:02,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2021-05-06 00:48:02,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:02,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-06 00:48:02,278 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 51 [2021-05-06 00:48:02,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:02,278 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-06 00:48:02,278 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), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:02,279 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-06 00:48:02,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 00:48:02,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:02,279 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:02,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:02,479 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:02,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:02,480 INFO L82 PathProgramCache]: Analyzing trace with hash 75693624, now seen corresponding path program 19 times [2021-05-06 00:48:02,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:02,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883022869] [2021-05-06 00:48:02,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:02,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:02,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:02,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:02,736 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:02,736 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:02,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883022869] [2021-05-06 00:48:02,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883022869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:02,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695589110] [2021-05-06 00:48:02,737 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 [2021-05-06 00:48:02,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:02,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-06 00:48:02,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:02,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:02,882 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:02,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695589110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:02,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:02,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-06 00:48:02,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092362255] [2021-05-06 00:48:02,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 00:48:02,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:02,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 00:48:02,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-06 00:48:02,883 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:03,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:03,811 INFO L93 Difference]: Finished difference Result 124 states and 136 transitions. [2021-05-06 00:48:03,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 00:48:03,812 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 00:48:03,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:03,812 INFO L225 Difference]: With dead ends: 124 [2021-05-06 00:48:03,812 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 00:48:03,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 760.7ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 00:48:03,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 00:48:03,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 62. [2021-05-06 00:48:03,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:03,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2021-05-06 00:48:03,825 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 53 [2021-05-06 00:48:03,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:03,825 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2021-05-06 00:48:03,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:03,825 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2021-05-06 00:48:03,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 00:48:03,825 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:03,825 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:04,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:04,043 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:04,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:04,043 INFO L82 PathProgramCache]: Analyzing trace with hash 360095638, now seen corresponding path program 20 times [2021-05-06 00:48:04,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:04,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611899289] [2021-05-06 00:48:04,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:04,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:04,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:04,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:04,313 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:04,313 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:04,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611899289] [2021-05-06 00:48:04,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611899289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:04,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563843383] [2021-05-06 00:48:04,313 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 [2021-05-06 00:48:04,365 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:48:04,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:04,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-06 00:48:04,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:04,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:04,486 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:04,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563843383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:04,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:04,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-06 00:48:04,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064065054] [2021-05-06 00:48:04,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 00:48:04,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:04,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 00:48:04,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 00:48:04,487 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:05,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:05,676 INFO L93 Difference]: Finished difference Result 128 states and 140 transitions. [2021-05-06 00:48:05,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 00:48:05,677 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-06 00:48:05,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:05,678 INFO L225 Difference]: With dead ends: 128 [2021-05-06 00:48:05,678 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 00:48:05,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 895.9ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 00:48:05,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 00:48:05,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 64. [2021-05-06 00:48:05,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 58 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:05,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-05-06 00:48:05,682 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 55 [2021-05-06 00:48:05,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:05,682 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-05-06 00:48:05,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:05,682 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-05-06 00:48:05,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 00:48:05,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:05,682 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:05,888 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 00:48:05,889 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:05,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:05,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1207475852, now seen corresponding path program 21 times [2021-05-06 00:48:05,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:05,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759061172] [2021-05-06 00:48:05,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:05,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:06,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:06,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:06,189 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:06,189 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:06,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759061172] [2021-05-06 00:48:06,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759061172] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:06,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806657267] [2021-05-06 00:48:06,189 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 [2021-05-06 00:48:06,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-06 00:48:06,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:06,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-06 00:48:06,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:06,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:06,785 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:06,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806657267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:06,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:06,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-06 00:48:06,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579120741] [2021-05-06 00:48:06,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 00:48:06,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:06,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 00:48:06,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 00:48:06,786 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:07,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:07,927 INFO L93 Difference]: Finished difference Result 132 states and 144 transitions. [2021-05-06 00:48:07,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 00:48:07,927 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-06 00:48:07,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:07,927 INFO L225 Difference]: With dead ends: 132 [2021-05-06 00:48:07,928 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 00:48:07,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 949.0ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 00:48:07,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 00:48:07,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 66. [2021-05-06 00:48:07,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 60 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:07,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-05-06 00:48:07,932 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 57 [2021-05-06 00:48:07,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:07,932 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-05-06 00:48:07,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:07,932 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-05-06 00:48:07,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 00:48:07,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:07,933 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:08,137 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 00:48:08,137 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:08,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:08,137 INFO L82 PathProgramCache]: Analyzing trace with hash -110156846, now seen corresponding path program 22 times [2021-05-06 00:48:08,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:08,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225051096] [2021-05-06 00:48:08,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:08,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:08,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:08,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:08,542 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:08,542 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:08,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225051096] [2021-05-06 00:48:08,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225051096] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:08,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031692106] [2021-05-06 00:48:08,542 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 [2021-05-06 00:48:08,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:48:08,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:08,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-06 00:48:08,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:08,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:08,697 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:08,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031692106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:08,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:08,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-06 00:48:08,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764395903] [2021-05-06 00:48:08,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 00:48:08,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:08,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 00:48:08,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-06 00:48:08,698 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:09,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:09,865 INFO L93 Difference]: Finished difference Result 136 states and 148 transitions. [2021-05-06 00:48:09,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 00:48:09,865 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 00:48:09,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:09,865 INFO L225 Difference]: With dead ends: 136 [2021-05-06 00:48:09,865 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 00:48:09,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 934.0ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 00:48:09,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 00:48:09,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2021-05-06 00:48:09,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 62 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:09,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-05-06 00:48:09,869 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 59 [2021-05-06 00:48:09,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:09,869 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-05-06 00:48:09,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:09,870 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-05-06 00:48:09,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 00:48:09,870 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:09,870 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:10,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:10,077 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:10,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:10,077 INFO L82 PathProgramCache]: Analyzing trace with hash 2146420400, now seen corresponding path program 23 times [2021-05-06 00:48:10,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:10,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605741093] [2021-05-06 00:48:10,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:10,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:10,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:10,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:10,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:10,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605741093] [2021-05-06 00:48:10,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605741093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:10,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578532342] [2021-05-06 00:48:10,425 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 [2021-05-06 00:48:11,987 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-06 00:48:11,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:11,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-06 00:48:11,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:12,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:12,347 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:12,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578532342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:12,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:12,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-06 00:48:12,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442859115] [2021-05-06 00:48:12,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 00:48:12,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:12,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 00:48:12,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 00:48:12,348 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:13,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:13,559 INFO L93 Difference]: Finished difference Result 140 states and 152 transitions. [2021-05-06 00:48:13,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 00:48:13,560 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-06 00:48:13,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:13,560 INFO L225 Difference]: With dead ends: 140 [2021-05-06 00:48:13,560 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 00:48:13,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 42 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 1178.1ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 00:48:13,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 00:48:13,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2021-05-06 00:48:13,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:13,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-05-06 00:48:13,564 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 61 [2021-05-06 00:48:13,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:13,564 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-05-06 00:48:13,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:13,564 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-05-06 00:48:13,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 00:48:13,565 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:13,565 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:13,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 00:48:13,769 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:13,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:13,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1758669326, now seen corresponding path program 24 times [2021-05-06 00:48:13,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:13,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674094719] [2021-05-06 00:48:13,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:13,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:14,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:14,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:14,126 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:14,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674094719] [2021-05-06 00:48:14,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674094719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:14,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156017403] [2021-05-06 00:48:14,126 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 [2021-05-06 00:48:14,911 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-06 00:48:14,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:14,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 00:48:14,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:15,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:15,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:15,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:15,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:15,096 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:15,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156017403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:15,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:15,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 31 [2021-05-06 00:48:15,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568630118] [2021-05-06 00:48:15,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 00:48:15,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:15,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 00:48:15,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=846, Unknown=0, NotChecked=0, Total=930 [2021-05-06 00:48:15,099 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:16,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:16,493 INFO L93 Difference]: Finished difference Result 144 states and 156 transitions. [2021-05-06 00:48:16,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 00:48:16,501 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-06 00:48:16,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:16,501 INFO L225 Difference]: With dead ends: 144 [2021-05-06 00:48:16,501 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 00:48:16,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1086.7ms TimeCoverageRelationStatistics Valid=209, Invalid=2871, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 00:48:16,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 00:48:16,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-05-06 00:48:16,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:16,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-05-06 00:48:16,506 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 63 [2021-05-06 00:48:16,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:16,506 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-05-06 00:48:16,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:16,506 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-05-06 00:48:16,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 00:48:16,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:16,506 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:16,710 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:16,710 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:16,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:16,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1502925332, now seen corresponding path program 25 times [2021-05-06 00:48:16,711 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:16,711 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297967835] [2021-05-06 00:48:16,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:16,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:17,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:17,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:17,153 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:17,153 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:17,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297967835] [2021-05-06 00:48:17,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297967835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:17,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319933346] [2021-05-06 00:48:17,153 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 [2021-05-06 00:48:17,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:17,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 00:48:17,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:17,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:17,319 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:17,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319933346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:17,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:17,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-06 00:48:17,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576678443] [2021-05-06 00:48:17,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 00:48:17,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:17,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 00:48:17,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 00:48:17,320 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:18,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:18,708 INFO L93 Difference]: Finished difference Result 148 states and 160 transitions. [2021-05-06 00:48:18,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 00:48:18,708 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 00:48:18,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:18,708 INFO L225 Difference]: With dead ends: 148 [2021-05-06 00:48:18,708 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 00:48:18,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1094.6ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 00:48:18,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 00:48:18,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 74. [2021-05-06 00:48:18,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:18,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2021-05-06 00:48:18,721 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 65 [2021-05-06 00:48:18,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:18,721 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2021-05-06 00:48:18,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:18,721 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2021-05-06 00:48:18,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 00:48:18,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:18,721 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:18,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 00:48:18,925 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:18,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:18,926 INFO L82 PathProgramCache]: Analyzing trace with hash -569265590, now seen corresponding path program 26 times [2021-05-06 00:48:18,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:18,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363399352] [2021-05-06 00:48:18,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:18,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:19,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:19,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:19,357 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:19,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:19,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363399352] [2021-05-06 00:48:19,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363399352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:19,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16936923] [2021-05-06 00:48:19,357 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 [2021-05-06 00:48:19,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:48:19,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:19,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-06 00:48:19,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:19,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:19,541 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:19,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16936923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:19,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:19,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-06 00:48:19,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596892379] [2021-05-06 00:48:19,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 00:48:19,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:19,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 00:48:19,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 00:48:19,542 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:21,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:21,027 INFO L93 Difference]: Finished difference Result 152 states and 164 transitions. [2021-05-06 00:48:21,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 00:48:21,027 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-06 00:48:21,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:21,028 INFO L225 Difference]: With dead ends: 152 [2021-05-06 00:48:21,028 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 00:48:21,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1126.7ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 00:48:21,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 00:48:21,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2021-05-06 00:48:21,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 70 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:21,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-05-06 00:48:21,032 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 67 [2021-05-06 00:48:21,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:21,033 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-05-06 00:48:21,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:21,033 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-05-06 00:48:21,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 00:48:21,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:21,033 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:21,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 00:48:21,249 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:21,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:21,250 INFO L82 PathProgramCache]: Analyzing trace with hash -970418392, now seen corresponding path program 27 times [2021-05-06 00:48:21,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:21,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312924426] [2021-05-06 00:48:21,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:21,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:21,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:21,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:21,677 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:21,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:21,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312924426] [2021-05-06 00:48:21,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312924426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:21,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974132882] [2021-05-06 00:48:21,678 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 [2021-05-06 00:48:22,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-06 00:48:22,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:22,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-06 00:48:22,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:22,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:22,600 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:22,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974132882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:22,600 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:22,600 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 00:48:22,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127111040] [2021-05-06 00:48:22,601 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 00:48:22,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:22,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 00:48:22,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 00:48:22,601 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:24,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:24,108 INFO L93 Difference]: Finished difference Result 156 states and 168 transitions. [2021-05-06 00:48:24,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 00:48:24,109 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-06 00:48:24,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:24,109 INFO L225 Difference]: With dead ends: 156 [2021-05-06 00:48:24,109 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 00:48:24,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 60 SyntacticMatches, 12 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1382.5ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 00:48:24,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 00:48:24,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 78. [2021-05-06 00:48:24,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 72 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:24,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-05-06 00:48:24,114 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 69 [2021-05-06 00:48:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:24,114 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-05-06 00:48:24,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:24,114 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-05-06 00:48:24,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 00:48:24,114 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:24,114 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:24,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:24,317 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:24,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:24,317 INFO L82 PathProgramCache]: Analyzing trace with hash 68795526, now seen corresponding path program 28 times [2021-05-06 00:48:24,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:24,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850574705] [2021-05-06 00:48:24,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:24,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:24,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:24,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:24,793 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:24,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:24,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850574705] [2021-05-06 00:48:24,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850574705] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:24,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799705078] [2021-05-06 00:48:24,794 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 [2021-05-06 00:48:24,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:48:24,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:24,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-06 00:48:24,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:24,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:24,973 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:24,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799705078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:24,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:24,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-06 00:48:24,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897333103] [2021-05-06 00:48:24,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 00:48:24,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:24,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 00:48:24,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 00:48:24,974 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:26,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:26,626 INFO L93 Difference]: Finished difference Result 160 states and 172 transitions. [2021-05-06 00:48:26,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 00:48:26,626 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 00:48:26,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:26,626 INFO L225 Difference]: With dead ends: 160 [2021-05-06 00:48:26,627 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 00:48:26,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1276.4ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 00:48:26,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 00:48:26,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 80. [2021-05-06 00:48:26,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:26,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-05-06 00:48:26,631 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 71 [2021-05-06 00:48:26,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:26,631 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-05-06 00:48:26,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:26,631 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-05-06 00:48:26,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 00:48:26,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:26,632 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:26,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:26,832 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:26,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:26,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1974009244, now seen corresponding path program 29 times [2021-05-06 00:48:26,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:26,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765802107] [2021-05-06 00:48:26,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:26,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:27,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:27,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:27,321 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:27,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:27,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765802107] [2021-05-06 00:48:27,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765802107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:27,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360769792] [2021-05-06 00:48:27,322 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 [2021-05-06 00:48:34,849 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-05-06 00:48:34,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:34,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-06 00:48:34,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:35,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:35,265 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:35,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360769792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:35,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:35,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-06 00:48:35,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021164568] [2021-05-06 00:48:35,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 00:48:35,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:35,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 00:48:35,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:48:35,266 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:37,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:37,102 INFO L93 Difference]: Finished difference Result 164 states and 176 transitions. [2021-05-06 00:48:37,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 00:48:37,103 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-06 00:48:37,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:37,103 INFO L225 Difference]: With dead ends: 164 [2021-05-06 00:48:37,103 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 00:48:37,104 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 54 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1602.6ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 00:48:37,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 00:48:37,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 82. [2021-05-06 00:48:37,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 76 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:37,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-05-06 00:48:37,110 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 73 [2021-05-06 00:48:37,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:37,110 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-05-06 00:48:37,110 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 33 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:37,110 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-05-06 00:48:37,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 00:48:37,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:37,111 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:37,314 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-06 00:48:37,315 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:37,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:37,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1985628354, now seen corresponding path program 30 times [2021-05-06 00:48:37,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:37,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31820211] [2021-05-06 00:48:37,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:37,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:37,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:37,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:37,961 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:37,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:37,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31820211] [2021-05-06 00:48:37,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31820211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:37,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90358440] [2021-05-06 00:48:37,962 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 [2021-05-06 00:48:39,369 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-06 00:48:39,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:39,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-06 00:48:39,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:39,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:39,668 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:39,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90358440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:39,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:39,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-06 00:48:39,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725940078] [2021-05-06 00:48:39,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 00:48:39,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:39,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 00:48:39,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 00:48:39,669 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:41,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:41,472 INFO L93 Difference]: Finished difference Result 168 states and 180 transitions. [2021-05-06 00:48:41,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 00:48:41,473 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-06 00:48:41,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:41,473 INFO L225 Difference]: With dead ends: 168 [2021-05-06 00:48:41,474 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 00:48:41,476 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 69 SyntacticMatches, 9 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1632.4ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 00:48:41,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 00:48:41,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2021-05-06 00:48:41,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 78 states have (on average 1.064102564102564) internal successors, (83), 78 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:41,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-05-06 00:48:41,480 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 75 [2021-05-06 00:48:41,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:41,481 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-05-06 00:48:41,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:41,481 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-05-06 00:48:41,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 00:48:41,481 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:41,481 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:41,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:41,685 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:41,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:41,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1856335776, now seen corresponding path program 31 times [2021-05-06 00:48:41,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:41,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928724008] [2021-05-06 00:48:41,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:41,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:42,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:42,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:42,242 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:42,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:42,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928724008] [2021-05-06 00:48:42,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928724008] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:42,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461035331] [2021-05-06 00:48:42,242 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 [2021-05-06 00:48:42,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:42,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-06 00:48:42,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:42,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:42,415 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:42,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461035331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:42,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:42,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-06 00:48:42,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567332616] [2021-05-06 00:48:42,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 00:48:42,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:42,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 00:48:42,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 00:48:42,416 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:44,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:44,242 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2021-05-06 00:48:44,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 00:48:44,244 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 00:48:44,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:44,244 INFO L225 Difference]: With dead ends: 172 [2021-05-06 00:48:44,244 INFO L226 Difference]: Without dead ends: 94 [2021-05-06 00:48:44,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1460.0ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 00:48:44,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-06 00:48:44,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 86. [2021-05-06 00:48:44,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 80 states have (on average 1.0625) internal successors, (85), 80 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:44,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-05-06 00:48:44,249 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 77 [2021-05-06 00:48:44,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:44,249 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-05-06 00:48:44,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:44,249 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-05-06 00:48:44,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 00:48:44,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:44,250 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:44,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-06 00:48:44,457 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:44,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:44,457 INFO L82 PathProgramCache]: Analyzing trace with hash -2134747394, now seen corresponding path program 32 times [2021-05-06 00:48:44,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:44,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049136711] [2021-05-06 00:48:44,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:44,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:44,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:44,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:44,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:44,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:44,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049136711] [2021-05-06 00:48:44,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049136711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:44,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638198133] [2021-05-06 00:48:44,997 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 [2021-05-06 00:48:45,046 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:48:45,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:45,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-06 00:48:45,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:45,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:45,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:45,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638198133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:45,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:45,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-06 00:48:45,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768324027] [2021-05-06 00:48:45,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 00:48:45,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:45,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 00:48:45,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 00:48:45,171 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:47,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:47,196 INFO L93 Difference]: Finished difference Result 176 states and 188 transitions. [2021-05-06 00:48:47,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 00:48:47,197 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-06 00:48:47,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:47,197 INFO L225 Difference]: With dead ends: 176 [2021-05-06 00:48:47,197 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 00:48:47,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1519.9ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 00:48:47,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 00:48:47,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-06 00:48:47,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 82 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:47,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-05-06 00:48:47,202 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 79 [2021-05-06 00:48:47,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:47,202 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-05-06 00:48:47,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.108108108108108) internal successors, (78), 36 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:47,202 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-05-06 00:48:47,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 00:48:47,202 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:47,202 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:47,414 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-06 00:48:47,414 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:47,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:47,414 INFO L82 PathProgramCache]: Analyzing trace with hash 2135088860, now seen corresponding path program 33 times [2021-05-06 00:48:47,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:47,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92814310] [2021-05-06 00:48:47,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:47,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:48,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:48,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:48,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:48,009 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:48,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92814310] [2021-05-06 00:48:48,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92814310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:48,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697668928] [2021-05-06 00:48:48,009 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 [2021-05-06 00:48:48,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-06 00:48:48,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:48,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-06 00:48:48,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:48,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:48,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:48,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697668928] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:48,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:48,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-06 00:48:48,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645692831] [2021-05-06 00:48:48,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 00:48:48,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:48,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 00:48:48,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 00:48:48,994 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:51,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:51,015 INFO L93 Difference]: Finished difference Result 180 states and 192 transitions. [2021-05-06 00:48:51,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 00:48:51,017 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-06 00:48:51,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:51,017 INFO L225 Difference]: With dead ends: 180 [2021-05-06 00:48:51,017 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 00:48:51,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 74 SyntacticMatches, 10 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 1817.7ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 00:48:51,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 00:48:51,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 90. [2021-05-06 00:48:51,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 84 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:51,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-05-06 00:48:51,022 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 81 [2021-05-06 00:48:51,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:51,022 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-05-06 00:48:51,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 37 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:51,022 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-05-06 00:48:51,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 00:48:51,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:51,023 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:51,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-06 00:48:51,227 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:51,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:51,227 INFO L82 PathProgramCache]: Analyzing trace with hash -541006022, now seen corresponding path program 34 times [2021-05-06 00:48:51,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:51,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8146968] [2021-05-06 00:48:51,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:51,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:51,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:51,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:51,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:51,969 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:51,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8146968] [2021-05-06 00:48:51,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8146968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:51,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453710927] [2021-05-06 00:48:51,969 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 [2021-05-06 00:48:52,027 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:48:52,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:52,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-06 00:48:52,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:52,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:52,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:52,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453710927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:52,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:52,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-06 00:48:52,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206302291] [2021-05-06 00:48:52,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 00:48:52,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:52,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 00:48:52,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 00:48:52,171 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:54,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:54,354 INFO L93 Difference]: Finished difference Result 184 states and 196 transitions. [2021-05-06 00:48:54,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 00:48:54,354 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 00:48:54,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:54,355 INFO L225 Difference]: With dead ends: 184 [2021-05-06 00:48:54,355 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 00:48:54,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1805.0ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 00:48:54,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 00:48:54,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 92. [2021-05-06 00:48:54,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 86 states have (on average 1.058139534883721) internal successors, (91), 86 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:48:54,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-05-06 00:48:54,359 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 83 [2021-05-06 00:48:54,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:54,360 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-05-06 00:48:54,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:48:54,360 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-05-06 00:48:54,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 00:48:54,360 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:54,360 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:54,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-06 00:48:54,561 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:54,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:54,561 INFO L82 PathProgramCache]: Analyzing trace with hash 417222680, now seen corresponding path program 35 times [2021-05-06 00:48:54,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:54,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058598433] [2021-05-06 00:48:54,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:54,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:55,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:55,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:55,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:48:55,222 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:55,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058598433] [2021-05-06 00:48:55,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058598433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:55,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106868921] [2021-05-06 00:48:55,222 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 [2021-05-06 00:49:30,656 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-06 00:49:30,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:30,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 00:49:30,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:31,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:31,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:31,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106868921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:31,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:31,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-06 00:49:31,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582082157] [2021-05-06 00:49:31,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 00:49:31,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:31,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 00:49:31,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 00:49:31,367 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:33,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:33,482 INFO L93 Difference]: Finished difference Result 188 states and 200 transitions. [2021-05-06 00:49:33,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 00:49:33,483 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 00:49:33,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:33,483 INFO L225 Difference]: With dead ends: 188 [2021-05-06 00:49:33,483 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 00:49:33,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 57 SyntacticMatches, 31 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 2246.7ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 00:49:33,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 00:49:33,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 94. [2021-05-06 00:49:33,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:49:33,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 98 transitions. [2021-05-06 00:49:33,488 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 98 transitions. Word has length 85 [2021-05-06 00:49:33,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:33,488 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 98 transitions. [2021-05-06 00:49:33,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 39 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:33,488 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 98 transitions. [2021-05-06 00:49:33,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 00:49:33,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:33,489 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:33,689 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-06 00:49:33,689 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:33,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:33,689 INFO L82 PathProgramCache]: Analyzing trace with hash -2142963338, now seen corresponding path program 36 times [2021-05-06 00:49:33,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:33,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060214188] [2021-05-06 00:49:33,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:33,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:34,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:34,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:34,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:34,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:34,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060214188] [2021-05-06 00:49:34,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060214188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:34,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672457661] [2021-05-06 00:49:34,343 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 [2021-05-06 00:49:39,717 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-06 00:49:39,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:39,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 00:49:39,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:40,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:40,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672457661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:40,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:40,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-06 00:49:40,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272994916] [2021-05-06 00:49:40,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 00:49:40,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:40,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 00:49:40,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 00:49:40,349 INFO L87 Difference]: Start difference. First operand 94 states and 98 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:42,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:42,663 INFO L93 Difference]: Finished difference Result 192 states and 204 transitions. [2021-05-06 00:49:42,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 00:49:42,663 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-05-06 00:49:42,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:42,663 INFO L225 Difference]: With dead ends: 192 [2021-05-06 00:49:42,664 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 00:49:42,664 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 63 SyntacticMatches, 27 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 2267.1ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 00:49:42,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 00:49:42,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2021-05-06 00:49:42,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 90 states have (on average 1.0555555555555556) internal successors, (95), 90 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:49:42,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2021-05-06 00:49:42,673 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 87 [2021-05-06 00:49:42,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:42,674 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2021-05-06 00:49:42,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:42,674 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2021-05-06 00:49:42,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 00:49:42,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:42,677 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:42,882 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-06 00:49:42,882 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:42,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:42,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1465466028, now seen corresponding path program 37 times [2021-05-06 00:49:42,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:42,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142502774] [2021-05-06 00:49:42,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:42,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:43,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:43,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:43,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:43,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:43,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142502774] [2021-05-06 00:49:43,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142502774] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:43,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17073677] [2021-05-06 00:49:43,570 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 [2021-05-06 00:49:43,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:43,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-06 00:49:43,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:43,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:43,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:43,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17073677] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:43,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:43,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-06 00:49:43,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625400207] [2021-05-06 00:49:43,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 00:49:43,763 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:43,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 00:49:43,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 00:49:43,763 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:46,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:46,130 INFO L93 Difference]: Finished difference Result 196 states and 208 transitions. [2021-05-06 00:49:46,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 00:49:46,132 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 00:49:46,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:46,132 INFO L225 Difference]: With dead ends: 196 [2021-05-06 00:49:46,132 INFO L226 Difference]: Without dead ends: 106 [2021-05-06 00:49:46,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 1881.1ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 00:49:46,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-06 00:49:46,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 98. [2021-05-06 00:49:46,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 92 states have (on average 1.0543478260869565) internal successors, (97), 92 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:49:46,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-05-06 00:49:46,137 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 89 [2021-05-06 00:49:46,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:46,138 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-05-06 00:49:46,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0952380952380953) internal successors, (88), 41 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:46,138 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-05-06 00:49:46,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 00:49:46,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:46,138 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:46,342 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-06 00:49:46,343 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:46,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:46,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1069387186, now seen corresponding path program 38 times [2021-05-06 00:49:46,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:46,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909054481] [2021-05-06 00:49:46,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:46,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:47,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:47,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:47,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:47,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909054481] [2021-05-06 00:49:47,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909054481] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:47,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585187770] [2021-05-06 00:49:47,064 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 [2021-05-06 00:49:47,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:49:47,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:47,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-06 00:49:47,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:47,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:47,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:47,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585187770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:47,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:47,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-06 00:49:47,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571461704] [2021-05-06 00:49:47,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 00:49:47,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:47,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 00:49:47,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 00:49:47,260 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:49,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:49,812 INFO L93 Difference]: Finished difference Result 200 states and 212 transitions. [2021-05-06 00:49:49,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 00:49:49,813 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-06 00:49:49,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:49,813 INFO L225 Difference]: With dead ends: 200 [2021-05-06 00:49:49,813 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 00:49:49,814 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 1961.2ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 00:49:49,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 00:49:49,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2021-05-06 00:49:49,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.053191489361702) internal successors, (99), 94 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:49:49,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-05-06 00:49:49,818 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 91 [2021-05-06 00:49:49,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:49,819 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-05-06 00:49:49,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:49,819 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-05-06 00:49:49,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 00:49:49,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:49,819 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:50,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:49:50,035 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:50,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:50,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1816869008, now seen corresponding path program 39 times [2021-05-06 00:49:50,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:50,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13229015] [2021-05-06 00:49:50,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:50,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:50,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:50,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:50,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:50,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:50,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13229015] [2021-05-06 00:49:50,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13229015] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:50,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330361380] [2021-05-06 00:49:50,840 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 [2021-05-06 00:49:52,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-06 00:49:52,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:52,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-06 00:49:52,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:52,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:52,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:52,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330361380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:52,438 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:52,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-06 00:49:52,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941283824] [2021-05-06 00:49:52,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 00:49:52,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:52,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 00:49:52,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 00:49:52,438 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:55,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:55,033 INFO L93 Difference]: Finished difference Result 204 states and 216 transitions. [2021-05-06 00:49:55,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 00:49:55,034 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 00:49:55,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:55,034 INFO L225 Difference]: With dead ends: 204 [2021-05-06 00:49:55,034 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 00:49:55,035 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 2137.7ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 00:49:55,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 00:49:55,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2021-05-06 00:49:55,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 96 states have (on average 1.0520833333333333) internal successors, (101), 96 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:49:55,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2021-05-06 00:49:55,048 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 93 [2021-05-06 00:49:55,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:55,049 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2021-05-06 00:49:55,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 43 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:55,049 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2021-05-06 00:49:55,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 00:49:55,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:55,049 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:55,254 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:49:55,254 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:55,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:55,255 INFO L82 PathProgramCache]: Analyzing trace with hash -1407605778, now seen corresponding path program 40 times [2021-05-06 00:49:55,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:55,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481990681] [2021-05-06 00:49:55,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:55,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:56,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:56,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:56,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:56,079 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:56,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481990681] [2021-05-06 00:49:56,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481990681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:56,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033844210] [2021-05-06 00:49:56,080 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 [2021-05-06 00:49:56,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:49:56,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:56,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-06 00:49:56,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:56,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:56,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:49:56,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033844210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:56,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:56,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-06 00:49:56,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950880072] [2021-05-06 00:49:56,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 00:49:56,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:56,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 00:49:56,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 00:49:56,284 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:59,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:59,045 INFO L93 Difference]: Finished difference Result 208 states and 220 transitions. [2021-05-06 00:49:59,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 00:49:59,045 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 00:49:59,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:59,046 INFO L225 Difference]: With dead ends: 208 [2021-05-06 00:49:59,046 INFO L226 Difference]: Without dead ends: 112 [2021-05-06 00:49:59,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 2149.4ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 00:49:59,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-06 00:49:59,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 104. [2021-05-06 00:49:59,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 98 states have (on average 1.0510204081632653) internal successors, (103), 98 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:49:59,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2021-05-06 00:49:59,051 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 95 [2021-05-06 00:49:59,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:59,051 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2021-05-06 00:49:59,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.088888888888889) internal successors, (94), 44 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:49:59,052 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2021-05-06 00:49:59,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 00:49:59,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:59,052 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:59,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:49:59,268 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:59,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:59,268 INFO L82 PathProgramCache]: Analyzing trace with hash 838512588, now seen corresponding path program 41 times [2021-05-06 00:49:59,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:59,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212114239] [2021-05-06 00:49:59,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:59,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:00,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:50:00,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:00,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:50:00,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:50:00,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212114239] [2021-05-06 00:50:00,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212114239] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:50:00,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141466064] [2021-05-06 00:50:00,100 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 [2021-05-06 00:50:55,571 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-06 00:50:55,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:50:55,584 WARN L261 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-06 00:50:55,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:50:56,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:50:56,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:50:56,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141466064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:50:56,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:50:56,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-06 00:50:56,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044363645] [2021-05-06 00:50:56,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 00:50:56,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:50:56,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 00:50:56,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 00:50:56,540 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:50:59,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:50:59,379 INFO L93 Difference]: Finished difference Result 212 states and 224 transitions. [2021-05-06 00:50:59,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 00:50:59,379 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 00:50:59,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:50:59,380 INFO L225 Difference]: With dead ends: 212 [2021-05-06 00:50:59,380 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 00:50:59,380 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 59 SyntacticMatches, 41 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 2967.1ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 00:50:59,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 00:50:59,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 106. [2021-05-06 00:50:59,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 100 states have (on average 1.05) internal successors, (105), 100 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:50:59,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2021-05-06 00:50:59,385 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 97 [2021-05-06 00:50:59,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:50:59,386 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2021-05-06 00:50:59,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0869565217391304) internal successors, (96), 45 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:50:59,386 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2021-05-06 00:50:59,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 00:50:59,386 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:50:59,386 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:50:59,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-06 00:50:59,594 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:50:59,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:50:59,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1010287574, now seen corresponding path program 42 times [2021-05-06 00:50:59,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:50:59,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476858748] [2021-05-06 00:50:59,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:50:59,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:00,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:51:00,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:00,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:00,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:51:00,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476858748] [2021-05-06 00:51:00,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476858748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:00,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160952564] [2021-05-06 00:51:00,511 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 [2021-05-06 00:51:10,040 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-06 00:51:10,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:51:10,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-06 00:51:10,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:51:10,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:10,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160952564] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:10,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:51:10,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-06 00:51:10,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194241367] [2021-05-06 00:51:10,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 00:51:10,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:51:10,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 00:51:10,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 00:51:10,506 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:13,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:51:13,432 INFO L93 Difference]: Finished difference Result 216 states and 228 transitions. [2021-05-06 00:51:13,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 00:51:13,432 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-06 00:51:13,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:51:13,433 INFO L225 Difference]: With dead ends: 216 [2021-05-06 00:51:13,433 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 00:51:13,433 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 86 SyntacticMatches, 16 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 935 ImplicationChecksByTransitivity, 2591.1ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 00:51:13,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 00:51:13,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 108. [2021-05-06 00:51:13,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 102 states have (on average 1.0490196078431373) internal successors, (107), 102 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:51:13,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 112 transitions. [2021-05-06 00:51:13,438 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 112 transitions. Word has length 99 [2021-05-06 00:51:13,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:51:13,439 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 112 transitions. [2021-05-06 00:51:13,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:13,439 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 112 transitions. [2021-05-06 00:51:13,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 00:51:13,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:51:13,439 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:51:13,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:51:13,645 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:51:13,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:51:13,645 INFO L82 PathProgramCache]: Analyzing trace with hash 409217288, now seen corresponding path program 43 times [2021-05-06 00:51:13,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:51:13,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122539802] [2021-05-06 00:51:13,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:51:13,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:14,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:51:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:14,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:14,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:51:14,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122539802] [2021-05-06 00:51:14,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122539802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:14,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503346834] [2021-05-06 00:51:14,545 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 [2021-05-06 00:51:14,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:14,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-06 00:51:14,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:51:14,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:51:14,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:14,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503346834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:14,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:51:14,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-06 00:51:14,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80591834] [2021-05-06 00:51:14,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 00:51:14,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:51:14,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 00:51:14,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 00:51:14,778 INFO L87 Difference]: Start difference. First operand 108 states and 112 transitions. Second operand has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:18,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:51:18,016 INFO L93 Difference]: Finished difference Result 220 states and 232 transitions. [2021-05-06 00:51:18,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 00:51:18,017 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 00:51:18,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:51:18,017 INFO L225 Difference]: With dead ends: 220 [2021-05-06 00:51:18,017 INFO L226 Difference]: Without dead ends: 118 [2021-05-06 00:51:18,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 2424.3ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 00:51:18,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-06 00:51:18,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 110. [2021-05-06 00:51:18,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 104 states have (on average 1.0480769230769231) internal successors, (109), 104 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:51:18,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2021-05-06 00:51:18,043 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 101 [2021-05-06 00:51:18,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:51:18,043 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2021-05-06 00:51:18,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 47 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:18,043 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2021-05-06 00:51:18,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 00:51:18,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:51:18,043 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:51:18,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:51:18,249 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:51:18,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:51:18,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1246210458, now seen corresponding path program 44 times [2021-05-06 00:51:18,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:51:18,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430371480] [2021-05-06 00:51:18,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:51:18,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:19,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:51:19,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:19,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:19,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:51:19,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430371480] [2021-05-06 00:51:19,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430371480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:19,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620574633] [2021-05-06 00:51:19,269 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 [2021-05-06 00:51:19,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:51:19,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:51:19,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-06 00:51:19,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:51:19,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:51:19,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:19,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620574633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:19,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:51:19,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-06 00:51:19,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750662736] [2021-05-06 00:51:19,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 00:51:19,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:51:19,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 00:51:19,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 00:51:19,478 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:22,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:51:22,722 INFO L93 Difference]: Finished difference Result 224 states and 236 transitions. [2021-05-06 00:51:22,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 00:51:22,722 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 00:51:22,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:51:22,723 INFO L225 Difference]: With dead ends: 224 [2021-05-06 00:51:22,723 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 00:51:22,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2536.9ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 00:51:22,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 00:51:22,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 112. [2021-05-06 00:51:22,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 106 states have (on average 1.0471698113207548) internal successors, (111), 106 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:51:22,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 116 transitions. [2021-05-06 00:51:22,728 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 116 transitions. Word has length 103 [2021-05-06 00:51:22,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:51:22,728 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 116 transitions. [2021-05-06 00:51:22,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:22,729 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 116 transitions. [2021-05-06 00:51:22,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 00:51:22,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:51:22,729 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:51:22,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-06 00:51:22,945 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:51:22,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:51:22,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1320592452, now seen corresponding path program 45 times [2021-05-06 00:51:22,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:51:22,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947392693] [2021-05-06 00:51:22,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:51:22,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:23,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:51:23,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:23,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:23,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:51:23,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947392693] [2021-05-06 00:51:23,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947392693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:23,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458285842] [2021-05-06 00:51:23,903 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 [2021-05-06 00:51:26,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-05-06 00:51:26,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:51:26,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-06 00:51:26,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:51:27,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:27,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458285842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:27,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:51:27,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-06 00:51:27,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573004246] [2021-05-06 00:51:27,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 00:51:27,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:51:27,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 00:51:27,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 00:51:27,235 INFO L87 Difference]: Start difference. First operand 112 states and 116 transitions. Second operand has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:30,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:51:30,598 INFO L93 Difference]: Finished difference Result 228 states and 240 transitions. [2021-05-06 00:51:30,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 00:51:30,598 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-06 00:51:30,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:51:30,599 INFO L225 Difference]: With dead ends: 228 [2021-05-06 00:51:30,599 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 00:51:30,599 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1047 ImplicationChecksByTransitivity, 2725.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 00:51:30,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 00:51:30,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 114. [2021-05-06 00:51:30,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 108 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:51:30,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2021-05-06 00:51:30,605 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 105 [2021-05-06 00:51:30,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:51:30,605 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2021-05-06 00:51:30,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.08) internal successors, (104), 49 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:30,605 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2021-05-06 00:51:30,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 00:51:30,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:51:30,605 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:51:30,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-06 00:51:30,810 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:51:30,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:51:30,810 INFO L82 PathProgramCache]: Analyzing trace with hash -1588006238, now seen corresponding path program 46 times [2021-05-06 00:51:30,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:51:30,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812289844] [2021-05-06 00:51:30,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:51:30,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:31,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:51:31,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:31,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:31,807 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:51:31,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812289844] [2021-05-06 00:51:31,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812289844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:31,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504339017] [2021-05-06 00:51:31,807 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 [2021-05-06 00:51:31,859 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:51:31,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:51:31,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-06 00:51:31,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:51:32,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:51:32,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:32,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504339017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:32,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:51:32,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-06 00:51:32,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810044699] [2021-05-06 00:51:32,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 00:51:32,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:51:32,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 00:51:32,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 00:51:32,039 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:35,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:51:35,514 INFO L93 Difference]: Finished difference Result 232 states and 244 transitions. [2021-05-06 00:51:35,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 00:51:35,515 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 00:51:35,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:51:35,515 INFO L225 Difference]: With dead ends: 232 [2021-05-06 00:51:35,515 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 00:51:35,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 2679.8ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 00:51:35,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 00:51:35,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 116. [2021-05-06 00:51:35,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 110 states have (on average 1.0454545454545454) internal successors, (115), 110 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:51:35,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2021-05-06 00:51:35,521 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 107 [2021-05-06 00:51:35,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:51:35,521 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2021-05-06 00:51:35,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:51:35,521 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2021-05-06 00:51:35,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 00:51:35,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:51:35,522 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:51:35,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-06 00:51:35,722 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:51:35,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:51:35,723 INFO L82 PathProgramCache]: Analyzing trace with hash -727637632, now seen corresponding path program 47 times [2021-05-06 00:51:35,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:51:35,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741679451] [2021-05-06 00:51:35,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:51:35,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:36,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:51:36,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:51:36,811 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:51:36,811 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:51:36,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741679451] [2021-05-06 00:51:36,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741679451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:51:36,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421613601] [2021-05-06 00:51:36,811 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 [2021-05-06 00:53:09,060 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-06 00:53:09,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:09,078 WARN L261 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 142 conjunts are in the unsatisfiable core [2021-05-06 00:53:09,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:10,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:10,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:10,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421613601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:10,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:10,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-06 00:53:10,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833247333] [2021-05-06 00:53:10,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 00:53:10,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:10,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 00:53:10,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 00:53:10,230 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:13,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:13,841 INFO L93 Difference]: Finished difference Result 236 states and 248 transitions. [2021-05-06 00:53:13,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 00:53:13,841 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-06 00:53:13,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:13,842 INFO L225 Difference]: With dead ends: 236 [2021-05-06 00:53:13,842 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 00:53:13,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 66 SyntacticMatches, 46 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1222 ImplicationChecksByTransitivity, 3756.3ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 00:53:13,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 00:53:13,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 118. [2021-05-06 00:53:13,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 112 states have (on average 1.0446428571428572) internal successors, (117), 112 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:53:13,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2021-05-06 00:53:13,848 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 109 [2021-05-06 00:53:13,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:13,848 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2021-05-06 00:53:13,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.076923076923077) internal successors, (108), 51 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:13,848 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2021-05-06 00:53:13,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-06 00:53:13,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:13,849 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:14,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:53:14,049 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:14,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:14,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1452871902, now seen corresponding path program 48 times [2021-05-06 00:53:14,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:14,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811266304] [2021-05-06 00:53:14,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:14,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:15,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:15,139 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:15,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811266304] [2021-05-06 00:53:15,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811266304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:15,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146106577] [2021-05-06 00:53:15,139 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 [2021-05-06 00:53:27,466 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2021-05-06 00:53:27,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:27,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-06 00:53:27,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:27,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:27,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146106577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:27,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:27,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-06 00:53:27,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583436504] [2021-05-06 00:53:27,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 00:53:27,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:27,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 00:53:27,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 00:53:27,989 INFO L87 Difference]: Start difference. First operand 118 states and 122 transitions. Second operand has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:31,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:31,676 INFO L93 Difference]: Finished difference Result 240 states and 252 transitions. [2021-05-06 00:53:31,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 00:53:31,676 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-05-06 00:53:31,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:31,677 INFO L225 Difference]: With dead ends: 240 [2021-05-06 00:53:31,677 INFO L226 Difference]: Without dead ends: 128 [2021-05-06 00:53:31,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 99 SyntacticMatches, 15 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1206 ImplicationChecksByTransitivity, 3154.0ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 00:53:31,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-06 00:53:31,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2021-05-06 00:53:31,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 114 states have (on average 1.043859649122807) internal successors, (119), 114 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:53:31,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2021-05-06 00:53:31,683 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 111 [2021-05-06 00:53:31,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:31,683 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2021-05-06 00:53:31,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0754716981132075) internal successors, (110), 52 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:31,683 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2021-05-06 00:53:31,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 00:53:31,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:31,683 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:31,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:53:31,890 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:31,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:31,890 INFO L82 PathProgramCache]: Analyzing trace with hash 978493628, now seen corresponding path program 49 times [2021-05-06 00:53:31,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:31,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488956896] [2021-05-06 00:53:31,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:31,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:32,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:32,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:32,976 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:32,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488956896] [2021-05-06 00:53:32,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488956896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:32,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436992080] [2021-05-06 00:53:32,976 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 [2021-05-06 00:53:33,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:33,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-06 00:53:33,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:33,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:33,209 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:33,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436992080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:33,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:33,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-06 00:53:33,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475480570] [2021-05-06 00:53:33,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 00:53:33,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:33,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 00:53:33,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 00:53:33,210 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:37,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:37,244 INFO L93 Difference]: Finished difference Result 244 states and 256 transitions. [2021-05-06 00:53:37,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 00:53:37,245 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-06 00:53:37,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:37,246 INFO L225 Difference]: With dead ends: 244 [2021-05-06 00:53:37,246 INFO L226 Difference]: Without dead ends: 130 [2021-05-06 00:53:37,247 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 2955.0ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 00:53:37,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-06 00:53:37,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 122. [2021-05-06 00:53:37,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 116 states have (on average 1.043103448275862) internal successors, (121), 116 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:53:37,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-05-06 00:53:37,252 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 113 [2021-05-06 00:53:37,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:37,266 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-05-06 00:53:37,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.074074074074074) internal successors, (112), 53 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:37,267 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-05-06 00:53:37,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 00:53:37,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:37,267 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:37,481 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:53:37,481 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:37,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:37,481 INFO L82 PathProgramCache]: Analyzing trace with hash 367505690, now seen corresponding path program 50 times [2021-05-06 00:53:37,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:37,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369201104] [2021-05-06 00:53:37,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:37,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:38,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:38,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:38,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:38,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:38,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369201104] [2021-05-06 00:53:38,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369201104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:38,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158183694] [2021-05-06 00:53:38,677 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 [2021-05-06 00:53:38,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:53:38,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:38,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 00:53:38,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:38,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:38,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:38,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158183694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:38,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:38,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-06 00:53:38,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922150223] [2021-05-06 00:53:38,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 00:53:38,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:38,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 00:53:38,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 00:53:38,928 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:42,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:42,858 INFO L93 Difference]: Finished difference Result 248 states and 260 transitions. [2021-05-06 00:53:42,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 00:53:42,859 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-06 00:53:42,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:42,859 INFO L225 Difference]: With dead ends: 248 [2021-05-06 00:53:42,859 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 00:53:42,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3007.7ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 00:53:42,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 00:53:42,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2021-05-06 00:53:42,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.0423728813559323) internal successors, (123), 118 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:53:42,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2021-05-06 00:53:42,865 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 115 [2021-05-06 00:53:42,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:42,865 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2021-05-06 00:53:42,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:42,865 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2021-05-06 00:53:42,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 00:53:42,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:42,866 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:43,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:53:43,077 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:43,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:43,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1618616824, now seen corresponding path program 51 times [2021-05-06 00:53:43,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:43,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577624187] [2021-05-06 00:53:43,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:43,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:44,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:44,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:44,265 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:44,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577624187] [2021-05-06 00:53:44,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577624187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:44,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200870752] [2021-05-06 00:53:44,265 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 [2021-05-06 00:53:46,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-05-06 00:53:46,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:46,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-06 00:53:46,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:47,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:47,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:47,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200870752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:47,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:47,322 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-06 00:53:47,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441905749] [2021-05-06 00:53:47,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 00:53:47,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:47,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 00:53:47,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 00:53:47,323 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:51,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:51,368 INFO L93 Difference]: Finished difference Result 252 states and 264 transitions. [2021-05-06 00:53:51,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 00:53:51,369 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2021-05-06 00:53:51,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:51,369 INFO L225 Difference]: With dead ends: 252 [2021-05-06 00:53:51,369 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 00:53:51,370 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 115 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 3287.2ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 00:53:51,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 00:53:51,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 126. [2021-05-06 00:53:51,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:53:51,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 130 transitions. [2021-05-06 00:53:51,376 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 130 transitions. Word has length 117 [2021-05-06 00:53:51,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:51,376 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 130 transitions. [2021-05-06 00:53:51,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0714285714285716) internal successors, (116), 55 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:51,376 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 130 transitions. [2021-05-06 00:53:51,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 00:53:51,376 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:51,376 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:51,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-06 00:53:51,584 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:51,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:51,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1345573718, now seen corresponding path program 52 times [2021-05-06 00:53:51,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:51,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80377250] [2021-05-06 00:53:51,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:51,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:52,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:52,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:52,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:52,841 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:52,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80377250] [2021-05-06 00:53:52,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80377250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:52,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494423994] [2021-05-06 00:53:52,842 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 [2021-05-06 00:53:52,895 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:53:52,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:52,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-06 00:53:52,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:53,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:53,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:53,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494423994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:53,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:53,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-06 00:53:53,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506816798] [2021-05-06 00:53:53,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 00:53:53,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:53,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 00:53:53,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 00:53:53,077 INFO L87 Difference]: Start difference. First operand 126 states and 130 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:57,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:57,277 INFO L93 Difference]: Finished difference Result 256 states and 268 transitions. [2021-05-06 00:53:57,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 00:53:57,277 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 00:53:57,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:57,277 INFO L225 Difference]: With dead ends: 256 [2021-05-06 00:53:57,278 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 00:53:57,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1382 ImplicationChecksByTransitivity, 3230.2ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 00:53:57,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 00:53:57,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 128. [2021-05-06 00:53:57,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 122 states have (on average 1.040983606557377) internal successors, (127), 122 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:53:57,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 132 transitions. [2021-05-06 00:53:57,284 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 132 transitions. Word has length 119 [2021-05-06 00:53:57,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:57,284 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 132 transitions. [2021-05-06 00:53:57,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:53:57,284 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 132 transitions. [2021-05-06 00:53:57,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 00:53:57,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:57,285 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:57,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:53:57,501 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:57,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:57,501 INFO L82 PathProgramCache]: Analyzing trace with hash 944153908, now seen corresponding path program 53 times [2021-05-06 00:53:57,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:57,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248942738] [2021-05-06 00:53:57,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:57,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:58,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:58,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:58,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:53:58,781 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:58,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248942738] [2021-05-06 00:53:58,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248942738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:58,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730737356] [2021-05-06 00:53:58,781 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 [2021-05-06 00:55:47,424 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2021-05-06 00:55:47,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:55:47,445 WARN L261 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 159 conjunts are in the unsatisfiable core [2021-05-06 00:55:47,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:55:48,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:55:48,804 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:55:48,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730737356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:55:48,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:55:48,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-06 00:55:48,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190992229] [2021-05-06 00:55:48,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 00:55:48,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:55:48,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 00:55:48,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 00:55:48,805 INFO L87 Difference]: Start difference. First operand 128 states and 132 transitions. Second operand has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:55:53,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:55:53,342 INFO L93 Difference]: Finished difference Result 260 states and 272 transitions. [2021-05-06 00:55:53,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 00:55:53,343 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-06 00:55:53,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:55:53,343 INFO L225 Difference]: With dead ends: 260 [2021-05-06 00:55:53,343 INFO L226 Difference]: Without dead ends: 138 [2021-05-06 00:55:53,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 73 SyntacticMatches, 51 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 4546.9ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 00:55:53,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-06 00:55:53,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 130. [2021-05-06 00:55:53,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 124 states have (on average 1.0403225806451613) internal successors, (129), 124 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 00:55:53,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2021-05-06 00:55:53,349 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 121 [2021-05-06 00:55:53,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:55:53,350 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2021-05-06 00:55:53,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.0689655172413794) internal successors, (120), 57 states have internal predecessors, (120), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:55:53,350 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2021-05-06 00:55:53,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 00:55:53,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:55:53,350 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:55:53,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-06 00:55:53,551 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:55:53,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:55:53,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1726773138, now seen corresponding path program 54 times [2021-05-06 00:55:53,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:55:53,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396958252] [2021-05-06 00:55:53,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:55:53,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:55:54,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:55:54,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:55:54,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:55:54,902 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:55:54,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396958252] [2021-05-06 00:55:54,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396958252] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:55:54,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044496927] [2021-05-06 00:55:54,902 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