/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/reducercommutativity/max20-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 22:26:25,939 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 22:26:25,941 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 22:26:25,953 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 22:26:25,953 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 22:26:25,954 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 22:26:25,955 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 22:26:25,957 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 22:26:25,959 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 22:26:25,959 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 22:26:25,960 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 22:26:25,961 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 22:26:25,962 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 22:26:25,963 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 22:26:25,963 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 22:26:25,965 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 22:26:25,965 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 22:26:25,966 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 22:26:25,968 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 22:26:25,970 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 22:26:25,971 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 22:26:25,972 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 22:26:25,973 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 22:26:25,974 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 22:26:25,976 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 22:26:25,984 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 22:26:25,985 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 22:26:25,985 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 22:26:25,986 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 [2019-11-23 22:26:26,000 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 22:26:26,000 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 22:26:26,001 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 22:26:26,002 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 22:26:26,002 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 22:26:26,002 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 22:26:26,002 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 22:26:26,002 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 22:26:26,003 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 22:26:26,003 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 22:26:26,003 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 22:26:26,003 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 22:26:26,003 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 22:26:26,004 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 22:26:26,004 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 22:26:26,004 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 22:26:26,004 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 22:26:26,004 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 22:26:26,005 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 22:26:26,005 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 22:26:26,005 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 22:26:26,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 22:26:26,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 22:26:26,006 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 22:26:26,006 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 22:26:26,006 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 22:26:26,006 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 22:26:26,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 22:26:26,007 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 22:26:26,007 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 22:26:26,301 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 22:26:26,319 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 22:26:26,323 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 22:26:26,325 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 22:26:26,325 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 22:26:26,326 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/reducercommutativity/max20-1.i [2019-11-23 22:26:26,391 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09e21b2e9/46129150432c481ea42deb7bc717f5d0/FLAG0f56538aa [2019-11-23 22:26:26,787 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 22:26:26,790 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/reducercommutativity/max20-1.i [2019-11-23 22:26:26,795 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09e21b2e9/46129150432c481ea42deb7bc717f5d0/FLAG0f56538aa [2019-11-23 22:26:27,209 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09e21b2e9/46129150432c481ea42deb7bc717f5d0 [2019-11-23 22:26:27,219 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 22:26:27,220 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 22:26:27,222 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 22:26:27,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 22:26:27,225 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 22:26:27,226 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,229 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c9ac29d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27, skipping insertion in model container [2019-11-23 22:26:27,229 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,236 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 22:26:27,253 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 22:26:27,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 22:26:27,499 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 22:26:27,525 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 22:26:27,540 INFO L208 MainTranslator]: Completed translation [2019-11-23 22:26:27,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27 WrapperNode [2019-11-23 22:26:27,541 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 22:26:27,542 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 22:26:27,542 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 22:26:27,542 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 22:26:27,549 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,628 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,656 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 22:26:27,656 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 22:26:27,656 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 22:26:27,656 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 22:26:27,665 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,666 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,669 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,669 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,685 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,690 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,692 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (1/1) ... [2019-11-23 22:26:27,694 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 22:26:27,695 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 22:26:27,695 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 22:26:27,695 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 22:26:27,696 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (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 [2019-11-23 22:26:27,761 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 22:26:27,761 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 22:26:27,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 22:26:27,762 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 22:26:27,762 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 22:26:27,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 22:26:28,110 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 22:26:28,111 INFO L284 CfgBuilder]: Removed 15 assume(true) statements. [2019-11-23 22:26:28,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:26:28 BoogieIcfgContainer [2019-11-23 22:26:28,112 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 22:26:28,113 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 22:26:28,113 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 22:26:28,116 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 22:26:28,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 10:26:27" (1/3) ... [2019-11-23 22:26:28,117 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b080f85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:26:28, skipping insertion in model container [2019-11-23 22:26:28,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:26:27" (2/3) ... [2019-11-23 22:26:28,118 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b080f85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:26:28, skipping insertion in model container [2019-11-23 22:26:28,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:26:28" (3/3) ... [2019-11-23 22:26:28,119 INFO L109 eAbstractionObserver]: Analyzing ICFG max20-1.i [2019-11-23 22:26:28,128 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 22:26:28,134 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 22:26:28,144 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 22:26:28,166 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 22:26:28,167 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 22:26:28,167 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 22:26:28,167 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 22:26:28,167 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 22:26:28,167 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 22:26:28,168 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 22:26:28,168 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 22:26:28,183 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2019-11-23 22:26:28,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-23 22:26:28,189 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:28,189 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:28,190 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:28,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:28,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1332003061, now seen corresponding path program 1 times [2019-11-23 22:26:28,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:28,202 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44451465] [2019-11-23 22:26:28,203 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:28,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:28,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:26:28,323 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44451465] [2019-11-23 22:26:28,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:26:28,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 22:26:28,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86257399] [2019-11-23 22:26:28,328 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-23 22:26:28,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:28,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-23 22:26:28,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-23 22:26:28,340 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2019-11-23 22:26:28,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:28,357 INFO L93 Difference]: Finished difference Result 62 states and 86 transitions. [2019-11-23 22:26:28,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-23 22:26:28,358 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2019-11-23 22:26:28,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:28,366 INFO L225 Difference]: With dead ends: 62 [2019-11-23 22:26:28,366 INFO L226 Difference]: Without dead ends: 29 [2019-11-23 22:26:28,369 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-23 22:26:28,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-23 22:26:28,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-23 22:26:28,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-23 22:26:28,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2019-11-23 22:26:28,402 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 17 [2019-11-23 22:26:28,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:28,403 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2019-11-23 22:26:28,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-23 22:26:28,403 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2019-11-23 22:26:28,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-23 22:26:28,404 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:28,404 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:28,405 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:28,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:28,405 INFO L82 PathProgramCache]: Analyzing trace with hash 741944299, now seen corresponding path program 1 times [2019-11-23 22:26:28,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:28,406 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155764421] [2019-11-23 22:26:28,406 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:28,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:28,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:26:28,477 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155764421] [2019-11-23 22:26:28,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:26:28,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 22:26:28,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258833216] [2019-11-23 22:26:28,482 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 22:26:28,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:28,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 22:26:28,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:26:28,483 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand 3 states. [2019-11-23 22:26:28,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:28,513 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2019-11-23 22:26:28,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:26:28,513 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-11-23 22:26:28,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:28,514 INFO L225 Difference]: With dead ends: 56 [2019-11-23 22:26:28,515 INFO L226 Difference]: Without dead ends: 31 [2019-11-23 22:26:28,516 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:26:28,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-23 22:26:28,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-11-23 22:26:28,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-23 22:26:28,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2019-11-23 22:26:28,523 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 17 [2019-11-23 22:26:28,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:28,523 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2019-11-23 22:26:28,524 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 22:26:28,524 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2019-11-23 22:26:28,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-23 22:26:28,525 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:28,525 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:28,525 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:28,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:28,526 INFO L82 PathProgramCache]: Analyzing trace with hash -826131671, now seen corresponding path program 1 times [2019-11-23 22:26:28,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:28,526 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669764250] [2019-11-23 22:26:28,527 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:28,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:28,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 22:26:28,594 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669764250] [2019-11-23 22:26:28,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:26:28,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 22:26:28,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957183885] [2019-11-23 22:26:28,595 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 22:26:28,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:28,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 22:26:28,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:26:28,596 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 3 states. [2019-11-23 22:26:28,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:28,659 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2019-11-23 22:26:28,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:26:28,659 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-23 22:26:28,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:28,661 INFO L225 Difference]: With dead ends: 62 [2019-11-23 22:26:28,661 INFO L226 Difference]: Without dead ends: 42 [2019-11-23 22:26:28,661 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:26:28,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-23 22:26:28,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 33. [2019-11-23 22:26:28,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-23 22:26:28,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2019-11-23 22:26:28,668 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 19 [2019-11-23 22:26:28,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:28,669 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2019-11-23 22:26:28,669 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 22:26:28,669 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2019-11-23 22:26:28,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-23 22:26:28,670 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:28,670 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:28,671 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:28,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:28,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1925905852, now seen corresponding path program 1 times [2019-11-23 22:26:28,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:28,672 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053436519] [2019-11-23 22:26:28,672 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:28,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:28,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:26:28,751 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053436519] [2019-11-23 22:26:28,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:26:28,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 22:26:28,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347521550] [2019-11-23 22:26:28,752 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 22:26:28,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:28,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 22:26:28,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:26:28,753 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 3 states. [2019-11-23 22:26:28,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:28,770 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2019-11-23 22:26:28,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:26:28,770 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2019-11-23 22:26:28,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:28,771 INFO L225 Difference]: With dead ends: 46 [2019-11-23 22:26:28,771 INFO L226 Difference]: Without dead ends: 35 [2019-11-23 22:26:28,772 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:26:28,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-23 22:26:28,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-11-23 22:26:28,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-23 22:26:28,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-23 22:26:28,778 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 31 [2019-11-23 22:26:28,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:28,778 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-23 22:26:28,778 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 22:26:28,778 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-23 22:26:28,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-23 22:26:28,779 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:28,779 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:28,780 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:28,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:28,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1542894914, now seen corresponding path program 1 times [2019-11-23 22:26:28,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:28,781 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112108346] [2019-11-23 22:26:28,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:28,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:28,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:26:28,858 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112108346] [2019-11-23 22:26:28,859 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756145140] [2019-11-23 22:26:28,859 INFO L94 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 [2019-11-23 22:26:28,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:28,950 INFO L255 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 22:26:28,960 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:28,995 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:26:28,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:28,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-11-23 22:26:28,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925349537] [2019-11-23 22:26:28,997 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 22:26:28,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:28,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 22:26:28,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:26:28,998 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 5 states. [2019-11-23 22:26:29,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:29,020 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2019-11-23 22:26:29,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 22:26:29,021 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 33 [2019-11-23 22:26:29,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:29,022 INFO L225 Difference]: With dead ends: 66 [2019-11-23 22:26:29,022 INFO L226 Difference]: Without dead ends: 37 [2019-11-23 22:26:29,023 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:26:29,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-23 22:26:29,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-11-23 22:26:29,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-23 22:26:29,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-11-23 22:26:29,028 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 33 [2019-11-23 22:26:29,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:29,029 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-11-23 22:26:29,029 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 22:26:29,029 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-11-23 22:26:29,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-23 22:26:29,030 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:29,030 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:29,235 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:29,235 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:29,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:29,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1235585152, now seen corresponding path program 2 times [2019-11-23 22:26:29,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:29,236 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786211353] [2019-11-23 22:26:29,236 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:29,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:29,332 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:26:29,332 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786211353] [2019-11-23 22:26:29,333 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316628088] [2019-11-23 22:26:29,333 INFO L92 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 [2019-11-23 22:26:29,415 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:26:29,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:29,416 INFO L255 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 22:26:29,418 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:26:29,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:29,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-11-23 22:26:29,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988774861] [2019-11-23 22:26:29,438 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 22:26:29,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:29,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 22:26:29,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 22:26:29,439 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 6 states. [2019-11-23 22:26:29,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:29,483 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2019-11-23 22:26:29,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 22:26:29,484 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2019-11-23 22:26:29,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:29,489 INFO L225 Difference]: With dead ends: 68 [2019-11-23 22:26:29,489 INFO L226 Difference]: Without dead ends: 39 [2019-11-23 22:26:29,490 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 22:26:29,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-23 22:26:29,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2019-11-23 22:26:29,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-23 22:26:29,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2019-11-23 22:26:29,496 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 35 [2019-11-23 22:26:29,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:29,500 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2019-11-23 22:26:29,500 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 22:26:29,500 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2019-11-23 22:26:29,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-23 22:26:29,504 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:29,505 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:29,705 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:29,706 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:29,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:29,706 INFO L82 PathProgramCache]: Analyzing trace with hash -2031320002, now seen corresponding path program 3 times [2019-11-23 22:26:29,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:29,706 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303673852] [2019-11-23 22:26:29,707 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:29,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:29,780 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:26:29,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303673852] [2019-11-23 22:26:29,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789405033] [2019-11-23 22:26:29,781 INFO L92 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 [2019-11-23 22:26:29,842 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-23 22:26:29,842 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:29,843 INFO L255 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 22:26:29,845 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:29,870 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-23 22:26:29,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:29,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2019-11-23 22:26:29,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747072778] [2019-11-23 22:26:29,874 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 22:26:29,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:29,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 22:26:29,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:26:29,875 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand 8 states. [2019-11-23 22:26:29,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:29,989 INFO L93 Difference]: Finished difference Result 91 states and 114 transitions. [2019-11-23 22:26:29,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-23 22:26:29,989 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 37 [2019-11-23 22:26:29,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:29,990 INFO L225 Difference]: With dead ends: 91 [2019-11-23 22:26:29,990 INFO L226 Difference]: Without dead ends: 62 [2019-11-23 22:26:29,991 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:26:29,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-23 22:26:29,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2019-11-23 22:26:29,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-23 22:26:29,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2019-11-23 22:26:29,997 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 37 [2019-11-23 22:26:29,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:29,998 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2019-11-23 22:26:29,998 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 22:26:29,998 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2019-11-23 22:26:29,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-23 22:26:29,999 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:29,999 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:30,202 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:30,203 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:30,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:30,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1702871319, now seen corresponding path program 4 times [2019-11-23 22:26:30,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:30,203 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236690920] [2019-11-23 22:26:30,204 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:30,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:30,323 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-11-23 22:26:30,324 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236690920] [2019-11-23 22:26:30,324 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791634600] [2019-11-23 22:26:30,324 INFO L92 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 [2019-11-23 22:26:30,387 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:26:30,388 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:30,389 INFO L255 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 22:26:30,392 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:30,411 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-11-23 22:26:30,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:30,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-23 22:26:30,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63572610] [2019-11-23 22:26:30,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 22:26:30,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:30,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 22:26:30,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:26:30,413 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand 8 states. [2019-11-23 22:26:30,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:30,440 INFO L93 Difference]: Finished difference Result 96 states and 116 transitions. [2019-11-23 22:26:30,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 22:26:30,440 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2019-11-23 22:26:30,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:30,441 INFO L225 Difference]: With dead ends: 96 [2019-11-23 22:26:30,441 INFO L226 Difference]: Without dead ends: 55 [2019-11-23 22:26:30,442 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:26:30,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-23 22:26:30,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2019-11-23 22:26:30,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-23 22:26:30,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2019-11-23 22:26:30,448 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 51 [2019-11-23 22:26:30,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:30,449 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2019-11-23 22:26:30,449 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 22:26:30,449 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2019-11-23 22:26:30,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-23 22:26:30,450 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:30,450 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:30,654 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:30,655 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:30,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:30,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1048346411, now seen corresponding path program 5 times [2019-11-23 22:26:30,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:30,656 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199889283] [2019-11-23 22:26:30,656 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:30,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:30,750 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-11-23 22:26:30,750 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199889283] [2019-11-23 22:26:30,751 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669605827] [2019-11-23 22:26:30,751 INFO L92 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 [2019-11-23 22:26:30,835 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-23 22:26:30,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:30,840 INFO L255 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 22:26:30,843 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:30,895 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-11-23 22:26:30,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:30,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-11-23 22:26:30,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386687305] [2019-11-23 22:26:30,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 22:26:30,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:30,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 22:26:30,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:30,900 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand 11 states. [2019-11-23 22:26:31,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:31,019 INFO L93 Difference]: Finished difference Result 119 states and 148 transitions. [2019-11-23 22:26:31,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 22:26:31,019 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 53 [2019-11-23 22:26:31,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:31,020 INFO L225 Difference]: With dead ends: 119 [2019-11-23 22:26:31,020 INFO L226 Difference]: Without dead ends: 78 [2019-11-23 22:26:31,021 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:31,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-23 22:26:31,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 68. [2019-11-23 22:26:31,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-23 22:26:31,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 81 transitions. [2019-11-23 22:26:31,028 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 81 transitions. Word has length 53 [2019-11-23 22:26:31,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:31,028 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 81 transitions. [2019-11-23 22:26:31,028 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 22:26:31,029 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 81 transitions. [2019-11-23 22:26:31,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-23 22:26:31,029 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:31,030 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:31,240 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:31,241 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:31,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:31,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1823697106, now seen corresponding path program 6 times [2019-11-23 22:26:31,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:31,242 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307507826] [2019-11-23 22:26:31,242 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:31,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:31,345 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-11-23 22:26:31,345 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307507826] [2019-11-23 22:26:31,345 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578715147] [2019-11-23 22:26:31,345 INFO L92 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 [2019-11-23 22:26:31,404 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2019-11-23 22:26:31,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:31,406 INFO L255 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 22:26:31,415 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:31,447 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 22:26:31,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:31,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2019-11-23 22:26:31,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305962902] [2019-11-23 22:26:31,449 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 22:26:31,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:31,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 22:26:31,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:31,450 INFO L87 Difference]: Start difference. First operand 68 states and 81 transitions. Second operand 11 states. [2019-11-23 22:26:31,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:31,494 INFO L93 Difference]: Finished difference Result 127 states and 154 transitions. [2019-11-23 22:26:31,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 22:26:31,494 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 67 [2019-11-23 22:26:31,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:31,495 INFO L225 Difference]: With dead ends: 127 [2019-11-23 22:26:31,495 INFO L226 Difference]: Without dead ends: 74 [2019-11-23 22:26:31,496 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:31,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-23 22:26:31,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-11-23 22:26:31,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-23 22:26:31,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 85 transitions. [2019-11-23 22:26:31,502 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 85 transitions. Word has length 67 [2019-11-23 22:26:31,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:31,503 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 85 transitions. [2019-11-23 22:26:31,503 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 22:26:31,503 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 85 transitions. [2019-11-23 22:26:31,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-11-23 22:26:31,504 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:31,504 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:31,715 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:31,716 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:31,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:31,716 INFO L82 PathProgramCache]: Analyzing trace with hash 376662890, now seen corresponding path program 7 times [2019-11-23 22:26:31,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:31,717 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746227859] [2019-11-23 22:26:31,717 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:31,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:31,852 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 22:26:31,852 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746227859] [2019-11-23 22:26:31,853 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1332335322] [2019-11-23 22:26:31,853 INFO L92 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 [2019-11-23 22:26:31,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:31,936 INFO L255 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 22:26:31,943 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:31,967 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 22:26:31,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:31,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-11-23 22:26:31,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116522649] [2019-11-23 22:26:31,968 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 22:26:31,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:31,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 22:26:31,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:31,969 INFO L87 Difference]: Start difference. First operand 72 states and 85 transitions. Second operand 11 states. [2019-11-23 22:26:31,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:31,998 INFO L93 Difference]: Finished difference Result 130 states and 156 transitions. [2019-11-23 22:26:31,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 22:26:31,999 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 71 [2019-11-23 22:26:31,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:32,000 INFO L225 Difference]: With dead ends: 130 [2019-11-23 22:26:32,000 INFO L226 Difference]: Without dead ends: 75 [2019-11-23 22:26:32,000 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:32,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-11-23 22:26:32,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-11-23 22:26:32,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-11-23 22:26:32,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 87 transitions. [2019-11-23 22:26:32,006 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 87 transitions. Word has length 71 [2019-11-23 22:26:32,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:32,006 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 87 transitions. [2019-11-23 22:26:32,006 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 22:26:32,006 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 87 transitions. [2019-11-23 22:26:32,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-23 22:26:32,009 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:32,009 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:32,209 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:32,210 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:32,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:32,211 INFO L82 PathProgramCache]: Analyzing trace with hash -878190552, now seen corresponding path program 8 times [2019-11-23 22:26:32,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:32,211 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226647349] [2019-11-23 22:26:32,212 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:32,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:32,321 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 22:26:32,321 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226647349] [2019-11-23 22:26:32,322 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990006715] [2019-11-23 22:26:32,322 INFO L92 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 [2019-11-23 22:26:32,407 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:26:32,408 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:32,409 INFO L255 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-23 22:26:32,412 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:32,434 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 22:26:32,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:32,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-11-23 22:26:32,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531074527] [2019-11-23 22:26:32,435 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 22:26:32,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:32,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 22:26:32,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 22:26:32,436 INFO L87 Difference]: Start difference. First operand 74 states and 87 transitions. Second operand 12 states. [2019-11-23 22:26:32,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:32,471 INFO L93 Difference]: Finished difference Result 132 states and 158 transitions. [2019-11-23 22:26:32,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 22:26:32,472 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 73 [2019-11-23 22:26:32,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:32,473 INFO L225 Difference]: With dead ends: 132 [2019-11-23 22:26:32,473 INFO L226 Difference]: Without dead ends: 77 [2019-11-23 22:26:32,474 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 22:26:32,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-11-23 22:26:32,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-11-23 22:26:32,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-23 22:26:32,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2019-11-23 22:26:32,479 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 73 [2019-11-23 22:26:32,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:32,479 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2019-11-23 22:26:32,479 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 22:26:32,480 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2019-11-23 22:26:32,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-23 22:26:32,480 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:32,481 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:32,684 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:32,684 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:32,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:32,685 INFO L82 PathProgramCache]: Analyzing trace with hash 93461862, now seen corresponding path program 9 times [2019-11-23 22:26:32,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:32,685 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605047436] [2019-11-23 22:26:32,686 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:32,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:32,786 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 22:26:32,786 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605047436] [2019-11-23 22:26:32,786 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702033837] [2019-11-23 22:26:32,786 INFO L92 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 [2019-11-23 22:26:32,857 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-23 22:26:32,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:32,859 INFO L255 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 22:26:32,860 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:32,899 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-11-23 22:26:32,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:32,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5] total 15 [2019-11-23 22:26:32,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204826311] [2019-11-23 22:26:32,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-23 22:26:32,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:32,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-23 22:26:32,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2019-11-23 22:26:32,902 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand 15 states. [2019-11-23 22:26:32,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:32,961 INFO L93 Difference]: Finished difference Result 137 states and 164 transitions. [2019-11-23 22:26:32,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-23 22:26:32,963 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2019-11-23 22:26:32,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:32,963 INFO L225 Difference]: With dead ends: 137 [2019-11-23 22:26:32,964 INFO L226 Difference]: Without dead ends: 82 [2019-11-23 22:26:32,964 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2019-11-23 22:26:32,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-23 22:26:32,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-11-23 22:26:32,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-11-23 22:26:32,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 93 transitions. [2019-11-23 22:26:32,974 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 93 transitions. Word has length 75 [2019-11-23 22:26:32,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:32,974 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 93 transitions. [2019-11-23 22:26:32,974 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-23 22:26:32,974 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 93 transitions. [2019-11-23 22:26:32,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-23 22:26:32,975 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:32,975 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:33,179 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:33,179 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:33,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:33,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1555506594, now seen corresponding path program 10 times [2019-11-23 22:26:33,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:33,180 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975886299] [2019-11-23 22:26:33,180 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:33,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:33,336 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2019-11-23 22:26:33,337 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975886299] [2019-11-23 22:26:33,337 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261107895] [2019-11-23 22:26:33,337 INFO L92 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 [2019-11-23 22:26:33,404 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:26:33,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:33,405 INFO L255 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 22:26:33,407 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:33,464 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2019-11-23 22:26:33,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:33,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6] total 17 [2019-11-23 22:26:33,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043509954] [2019-11-23 22:26:33,465 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 22:26:33,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:33,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 22:26:33,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=180, Unknown=0, NotChecked=0, Total=272 [2019-11-23 22:26:33,466 INFO L87 Difference]: Start difference. First operand 80 states and 93 transitions. Second operand 17 states. [2019-11-23 22:26:33,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:33,642 INFO L93 Difference]: Finished difference Result 161 states and 196 transitions. [2019-11-23 22:26:33,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 22:26:33,643 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 79 [2019-11-23 22:26:33,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:33,644 INFO L225 Difference]: With dead ends: 161 [2019-11-23 22:26:33,644 INFO L226 Difference]: Without dead ends: 104 [2019-11-23 22:26:33,645 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=92, Invalid=180, Unknown=0, NotChecked=0, Total=272 [2019-11-23 22:26:33,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-11-23 22:26:33,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 94. [2019-11-23 22:26:33,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-11-23 22:26:33,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 110 transitions. [2019-11-23 22:26:33,649 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 110 transitions. Word has length 79 [2019-11-23 22:26:33,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:33,650 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 110 transitions. [2019-11-23 22:26:33,650 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 22:26:33,650 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 110 transitions. [2019-11-23 22:26:33,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-11-23 22:26:33,651 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:33,651 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:33,854 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:33,854 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:33,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:33,855 INFO L82 PathProgramCache]: Analyzing trace with hash -361354501, now seen corresponding path program 11 times [2019-11-23 22:26:33,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:33,856 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462395563] [2019-11-23 22:26:33,856 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:33,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:33,989 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-11-23 22:26:33,989 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462395563] [2019-11-23 22:26:33,989 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425527933] [2019-11-23 22:26:33,990 INFO L92 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 [2019-11-23 22:26:34,160 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-23 22:26:34,161 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:34,162 INFO L255 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 22:26:34,164 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:34,224 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 205 trivial. 0 not checked. [2019-11-23 22:26:34,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:34,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6] total 18 [2019-11-23 22:26:34,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722674831] [2019-11-23 22:26:34,227 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 22:26:34,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:34,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 22:26:34,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=201, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:26:34,230 INFO L87 Difference]: Start difference. First operand 94 states and 110 transitions. Second operand 18 states. [2019-11-23 22:26:34,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:34,311 INFO L93 Difference]: Finished difference Result 169 states and 202 transitions. [2019-11-23 22:26:34,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 22:26:34,311 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 93 [2019-11-23 22:26:34,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:34,312 INFO L225 Difference]: With dead ends: 169 [2019-11-23 22:26:34,312 INFO L226 Difference]: Without dead ends: 100 [2019-11-23 22:26:34,313 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=201, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:26:34,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-11-23 22:26:34,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2019-11-23 22:26:34,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2019-11-23 22:26:34,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 114 transitions. [2019-11-23 22:26:34,317 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 114 transitions. Word has length 93 [2019-11-23 22:26:34,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:34,318 INFO L462 AbstractCegarLoop]: Abstraction has 98 states and 114 transitions. [2019-11-23 22:26:34,318 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 22:26:34,318 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 114 transitions. [2019-11-23 22:26:34,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-11-23 22:26:34,319 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:34,319 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:34,523 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:34,524 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:34,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:34,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1370395191, now seen corresponding path program 12 times [2019-11-23 22:26:34,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:34,525 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972465399] [2019-11-23 22:26:34,525 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:34,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:34,682 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 22:26:34,682 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972465399] [2019-11-23 22:26:34,682 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048002198] [2019-11-23 22:26:34,683 INFO L92 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 [2019-11-23 22:26:34,944 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2019-11-23 22:26:34,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:34,947 INFO L255 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 22:26:34,949 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:35,045 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2019-11-23 22:26:35,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:35,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7] total 20 [2019-11-23 22:26:35,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599213113] [2019-11-23 22:26:35,046 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-23 22:26:35,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:35,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-23 22:26:35,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:26:35,047 INFO L87 Difference]: Start difference. First operand 98 states and 114 transitions. Second operand 20 states. [2019-11-23 22:26:35,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:35,139 INFO L93 Difference]: Finished difference Result 175 states and 208 transitions. [2019-11-23 22:26:35,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-23 22:26:35,139 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 97 [2019-11-23 22:26:35,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:35,140 INFO L225 Difference]: With dead ends: 175 [2019-11-23 22:26:35,140 INFO L226 Difference]: Without dead ends: 104 [2019-11-23 22:26:35,141 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:26:35,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-11-23 22:26:35,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 102. [2019-11-23 22:26:35,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-11-23 22:26:35,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 118 transitions. [2019-11-23 22:26:35,145 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 118 transitions. Word has length 97 [2019-11-23 22:26:35,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:35,146 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 118 transitions. [2019-11-23 22:26:35,146 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-23 22:26:35,146 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 118 transitions. [2019-11-23 22:26:35,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2019-11-23 22:26:35,147 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:35,147 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:35,350 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:35,351 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:35,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:35,351 INFO L82 PathProgramCache]: Analyzing trace with hash -259880077, now seen corresponding path program 13 times [2019-11-23 22:26:35,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:35,352 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316040269] [2019-11-23 22:26:35,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:35,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:35,691 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-23 22:26:35,691 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316040269] [2019-11-23 22:26:35,692 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313894897] [2019-11-23 22:26:35,692 INFO L92 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 [2019-11-23 22:26:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:35,781 INFO L255 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 22:26:35,784 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:35,812 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-23 22:26:35,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:35,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-11-23 22:26:35,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507195351] [2019-11-23 22:26:35,813 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 22:26:35,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:35,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 22:26:35,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 22:26:35,814 INFO L87 Difference]: Start difference. First operand 102 states and 118 transitions. Second operand 17 states. [2019-11-23 22:26:35,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:35,862 INFO L93 Difference]: Finished difference Result 178 states and 210 transitions. [2019-11-23 22:26:35,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-23 22:26:35,863 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 101 [2019-11-23 22:26:35,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:35,864 INFO L225 Difference]: With dead ends: 178 [2019-11-23 22:26:35,864 INFO L226 Difference]: Without dead ends: 105 [2019-11-23 22:26:35,864 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 22:26:35,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2019-11-23 22:26:35,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2019-11-23 22:26:35,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-23 22:26:35,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 120 transitions. [2019-11-23 22:26:35,868 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 120 transitions. Word has length 101 [2019-11-23 22:26:35,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:35,868 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 120 transitions. [2019-11-23 22:26:35,869 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 22:26:35,869 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 120 transitions. [2019-11-23 22:26:35,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2019-11-23 22:26:35,870 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:35,870 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:36,080 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:36,080 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:36,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:36,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1841782863, now seen corresponding path program 14 times [2019-11-23 22:26:36,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:36,081 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999437612] [2019-11-23 22:26:36,081 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:36,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:36,276 INFO L134 CoverageAnalysis]: Checked inductivity of 305 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-23 22:26:36,277 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999437612] [2019-11-23 22:26:36,282 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358323174] [2019-11-23 22:26:36,282 INFO L92 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 [2019-11-23 22:26:36,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:26:36,372 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:36,373 INFO L255 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-23 22:26:36,375 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:36,425 INFO L134 CoverageAnalysis]: Checked inductivity of 305 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-23 22:26:36,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:36,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2019-11-23 22:26:36,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231506440] [2019-11-23 22:26:36,430 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 22:26:36,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:36,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 22:26:36,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:26:36,431 INFO L87 Difference]: Start difference. First operand 104 states and 120 transitions. Second operand 18 states. [2019-11-23 22:26:36,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:36,480 INFO L93 Difference]: Finished difference Result 180 states and 212 transitions. [2019-11-23 22:26:36,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 22:26:36,482 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 103 [2019-11-23 22:26:36,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:36,482 INFO L225 Difference]: With dead ends: 180 [2019-11-23 22:26:36,482 INFO L226 Difference]: Without dead ends: 107 [2019-11-23 22:26:36,483 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:26:36,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-11-23 22:26:36,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2019-11-23 22:26:36,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-11-23 22:26:36,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 122 transitions. [2019-11-23 22:26:36,487 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 122 transitions. Word has length 103 [2019-11-23 22:26:36,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:36,487 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 122 transitions. [2019-11-23 22:26:36,487 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 22:26:36,487 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 122 transitions. [2019-11-23 22:26:36,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-11-23 22:26:36,488 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:36,488 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:36,691 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:36,692 INFO L410 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:36,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:36,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1631937425, now seen corresponding path program 15 times [2019-11-23 22:26:36,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:36,693 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089000978] [2019-11-23 22:26:36,694 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:36,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:36,858 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-23 22:26:36,859 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089000978] [2019-11-23 22:26:36,859 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338112389] [2019-11-23 22:26:36,859 INFO L92 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 [2019-11-23 22:26:36,995 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-23 22:26:36,995 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:36,996 INFO L255 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 22:26:36,998 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:37,082 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2019-11-23 22:26:37,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:37,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7] total 23 [2019-11-23 22:26:37,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998886283] [2019-11-23 22:26:37,083 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-23 22:26:37,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:37,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-23 22:26:37,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=333, Unknown=0, NotChecked=0, Total=506 [2019-11-23 22:26:37,084 INFO L87 Difference]: Start difference. First operand 106 states and 122 transitions. Second operand 23 states. [2019-11-23 22:26:37,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:37,328 INFO L93 Difference]: Finished difference Result 203 states and 244 transitions. [2019-11-23 22:26:37,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-23 22:26:37,328 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 105 [2019-11-23 22:26:37,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:37,330 INFO L225 Difference]: With dead ends: 203 [2019-11-23 22:26:37,330 INFO L226 Difference]: Without dead ends: 130 [2019-11-23 22:26:37,331 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=333, Unknown=0, NotChecked=0, Total=506 [2019-11-23 22:26:37,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2019-11-23 22:26:37,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 120. [2019-11-23 22:26:37,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-11-23 22:26:37,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 139 transitions. [2019-11-23 22:26:37,336 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 139 transitions. Word has length 105 [2019-11-23 22:26:37,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:37,337 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 139 transitions. [2019-11-23 22:26:37,337 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-23 22:26:37,337 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 139 transitions. [2019-11-23 22:26:37,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2019-11-23 22:26:37,338 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:37,338 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:37,541 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:37,542 INFO L410 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:37,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:37,542 INFO L82 PathProgramCache]: Analyzing trace with hash 2012967112, now seen corresponding path program 16 times [2019-11-23 22:26:37,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:37,542 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359157463] [2019-11-23 22:26:37,543 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:37,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:37,744 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-23 22:26:37,745 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359157463] [2019-11-23 22:26:37,745 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530631491] [2019-11-23 22:26:37,745 INFO L92 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 [2019-11-23 22:26:37,850 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:26:37,850 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:37,852 INFO L255 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 22:26:37,853 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:37,884 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-23 22:26:37,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:37,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-11-23 22:26:37,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33651370] [2019-11-23 22:26:37,887 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-23 22:26:37,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:37,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-23 22:26:37,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:26:37,888 INFO L87 Difference]: Start difference. First operand 120 states and 139 transitions. Second operand 20 states. [2019-11-23 22:26:37,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:37,954 INFO L93 Difference]: Finished difference Result 208 states and 246 transitions. [2019-11-23 22:26:37,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 22:26:37,955 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 119 [2019-11-23 22:26:37,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:37,955 INFO L225 Difference]: With dead ends: 208 [2019-11-23 22:26:37,956 INFO L226 Difference]: Without dead ends: 123 [2019-11-23 22:26:37,956 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:26:37,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2019-11-23 22:26:37,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2019-11-23 22:26:37,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2019-11-23 22:26:37,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 141 transitions. [2019-11-23 22:26:37,960 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 141 transitions. Word has length 119 [2019-11-23 22:26:37,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:37,960 INFO L462 AbstractCegarLoop]: Abstraction has 122 states and 141 transitions. [2019-11-23 22:26:37,960 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-23 22:26:37,961 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 141 transitions. [2019-11-23 22:26:37,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2019-11-23 22:26:37,961 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:37,962 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:38,165 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:38,165 INFO L410 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:38,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:38,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1998074246, now seen corresponding path program 17 times [2019-11-23 22:26:38,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:38,166 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025052441] [2019-11-23 22:26:38,166 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:38,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:38,392 INFO L134 CoverageAnalysis]: Checked inductivity of 449 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-23 22:26:38,392 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025052441] [2019-11-23 22:26:38,393 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846819098] [2019-11-23 22:26:38,393 INFO L92 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 [2019-11-23 22:26:38,823 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-23 22:26:38,823 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:38,827 INFO L255 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-23 22:26:38,829 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:38,856 INFO L134 CoverageAnalysis]: Checked inductivity of 449 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-23 22:26:38,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:38,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-11-23 22:26:38,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320146858] [2019-11-23 22:26:38,858 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-23 22:26:38,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:38,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-23 22:26:38,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-23 22:26:38,858 INFO L87 Difference]: Start difference. First operand 122 states and 141 transitions. Second operand 21 states. [2019-11-23 22:26:38,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:38,911 INFO L93 Difference]: Finished difference Result 210 states and 248 transitions. [2019-11-23 22:26:38,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-23 22:26:38,912 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 121 [2019-11-23 22:26:38,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:38,912 INFO L225 Difference]: With dead ends: 210 [2019-11-23 22:26:38,913 INFO L226 Difference]: Without dead ends: 125 [2019-11-23 22:26:38,913 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-23 22:26:38,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-11-23 22:26:38,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-11-23 22:26:38,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-11-23 22:26:38,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 143 transitions. [2019-11-23 22:26:38,917 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 143 transitions. Word has length 121 [2019-11-23 22:26:38,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:38,917 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 143 transitions. [2019-11-23 22:26:38,917 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-23 22:26:38,917 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 143 transitions. [2019-11-23 22:26:38,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-11-23 22:26:38,918 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:38,918 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:39,129 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:39,129 INFO L410 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:39,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:39,130 INFO L82 PathProgramCache]: Analyzing trace with hash 570931908, now seen corresponding path program 18 times [2019-11-23 22:26:39,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:39,131 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508346620] [2019-11-23 22:26:39,131 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:39,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:39,419 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2019-11-23 22:26:39,420 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508346620] [2019-11-23 22:26:39,420 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945397278] [2019-11-23 22:26:39,420 INFO L92 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 [2019-11-23 22:26:39,918 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-11-23 22:26:39,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:39,921 INFO L255 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 22:26:39,924 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:40,069 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 35 proven. 45 refuted. 0 times theorem prover too weak. 404 trivial. 0 not checked. [2019-11-23 22:26:40,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:40,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 29 [2019-11-23 22:26:40,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53729562] [2019-11-23 22:26:40,070 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-23 22:26:40,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:40,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-23 22:26:40,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=532, Unknown=0, NotChecked=0, Total=812 [2019-11-23 22:26:40,071 INFO L87 Difference]: Start difference. First operand 124 states and 143 transitions. Second operand 29 states. [2019-11-23 22:26:40,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:40,401 INFO L93 Difference]: Finished difference Result 234 states and 282 transitions. [2019-11-23 22:26:40,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-23 22:26:40,403 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 123 [2019-11-23 22:26:40,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:40,404 INFO L225 Difference]: With dead ends: 234 [2019-11-23 22:26:40,404 INFO L226 Difference]: Without dead ends: 149 [2019-11-23 22:26:40,404 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=334, Invalid=856, Unknown=0, NotChecked=0, Total=1190 [2019-11-23 22:26:40,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2019-11-23 22:26:40,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 140. [2019-11-23 22:26:40,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2019-11-23 22:26:40,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 162 transitions. [2019-11-23 22:26:40,409 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 162 transitions. Word has length 123 [2019-11-23 22:26:40,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:40,409 INFO L462 AbstractCegarLoop]: Abstraction has 140 states and 162 transitions. [2019-11-23 22:26:40,409 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-23 22:26:40,409 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 162 transitions. [2019-11-23 22:26:40,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-11-23 22:26:40,409 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:40,410 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:40,610 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:40,611 INFO L410 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:40,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:40,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1966928219, now seen corresponding path program 19 times [2019-11-23 22:26:40,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:40,612 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458921683] [2019-11-23 22:26:40,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:40,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:40,701 INFO L134 CoverageAnalysis]: Checked inductivity of 623 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 598 trivial. 0 not checked. [2019-11-23 22:26:40,702 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458921683] [2019-11-23 22:26:40,702 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449968982] [2019-11-23 22:26:40,702 INFO L92 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 [2019-11-23 22:26:40,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:40,792 INFO L255 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 22:26:40,794 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:40,868 INFO L134 CoverageAnalysis]: Checked inductivity of 623 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 557 trivial. 0 not checked. [2019-11-23 22:26:40,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:40,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2019-11-23 22:26:40,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003120359] [2019-11-23 22:26:40,870 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-23 22:26:40,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:40,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-23 22:26:40,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2019-11-23 22:26:40,870 INFO L87 Difference]: Start difference. First operand 140 states and 162 transitions. Second operand 15 states. [2019-11-23 22:26:41,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:41,052 INFO L93 Difference]: Finished difference Result 235 states and 281 transitions. [2019-11-23 22:26:41,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-23 22:26:41,052 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 139 [2019-11-23 22:26:41,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:41,053 INFO L225 Difference]: With dead ends: 235 [2019-11-23 22:26:41,053 INFO L226 Difference]: Without dead ends: 164 [2019-11-23 22:26:41,054 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2019-11-23 22:26:41,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-11-23 22:26:41,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2019-11-23 22:26:41,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-11-23 22:26:41,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 179 transitions. [2019-11-23 22:26:41,072 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 179 transitions. Word has length 139 [2019-11-23 22:26:41,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:41,075 INFO L462 AbstractCegarLoop]: Abstraction has 154 states and 179 transitions. [2019-11-23 22:26:41,075 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-23 22:26:41,075 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 179 transitions. [2019-11-23 22:26:41,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-11-23 22:26:41,076 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:41,076 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:41,282 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:41,283 INFO L410 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:41,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:41,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1805414284, now seen corresponding path program 20 times [2019-11-23 22:26:41,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:41,284 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233654345] [2019-11-23 22:26:41,284 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:41,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:41,406 INFO L134 CoverageAnalysis]: Checked inductivity of 709 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 618 trivial. 0 not checked. [2019-11-23 22:26:41,407 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233654345] [2019-11-23 22:26:41,407 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137077369] [2019-11-23 22:26:41,407 INFO L92 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 [2019-11-23 22:26:41,522 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:26:41,522 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:41,524 INFO L255 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 22:26:41,526 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:41,548 INFO L134 CoverageAnalysis]: Checked inductivity of 709 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 618 trivial. 0 not checked. [2019-11-23 22:26:41,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:41,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-11-23 22:26:41,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524793645] [2019-11-23 22:26:41,549 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 22:26:41,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:41,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 22:26:41,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:41,550 INFO L87 Difference]: Start difference. First operand 154 states and 179 transitions. Second operand 11 states. [2019-11-23 22:26:41,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:41,668 INFO L93 Difference]: Finished difference Result 256 states and 306 transitions. [2019-11-23 22:26:41,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 22:26:41,669 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 153 [2019-11-23 22:26:41,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:41,670 INFO L225 Difference]: With dead ends: 256 [2019-11-23 22:26:41,670 INFO L226 Difference]: Without dead ends: 175 [2019-11-23 22:26:41,670 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 22:26:41,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2019-11-23 22:26:41,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 166. [2019-11-23 22:26:41,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-11-23 22:26:41,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 194 transitions. [2019-11-23 22:26:41,676 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 194 transitions. Word has length 153 [2019-11-23 22:26:41,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:41,676 INFO L462 AbstractCegarLoop]: Abstraction has 166 states and 194 transitions. [2019-11-23 22:26:41,676 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 22:26:41,676 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 194 transitions. [2019-11-23 22:26:41,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-11-23 22:26:41,677 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:41,677 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:41,881 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:41,881 INFO L410 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:41,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:41,882 INFO L82 PathProgramCache]: Analyzing trace with hash 937870095, now seen corresponding path program 21 times [2019-11-23 22:26:41,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:41,883 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141987222] [2019-11-23 22:26:41,883 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:41,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:42,074 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2019-11-23 22:26:42,074 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141987222] [2019-11-23 22:26:42,075 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52831649] [2019-11-23 22:26:42,075 INFO L92 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 [2019-11-23 22:26:42,422 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-11-23 22:26:42,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:42,425 INFO L255 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 22:26:42,427 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:42,540 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2019-11-23 22:26:42,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:42,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2019-11-23 22:26:42,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160847391] [2019-11-23 22:26:42,541 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 22:26:42,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:42,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 22:26:42,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:26:42,542 INFO L87 Difference]: Start difference. First operand 166 states and 194 transitions. Second operand 18 states. [2019-11-23 22:26:42,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:42,721 INFO L93 Difference]: Finished difference Result 279 states and 335 transitions. [2019-11-23 22:26:42,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 22:26:42,722 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 165 [2019-11-23 22:26:42,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:42,723 INFO L225 Difference]: With dead ends: 279 [2019-11-23 22:26:42,723 INFO L226 Difference]: Without dead ends: 190 [2019-11-23 22:26:42,723 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:26:42,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-11-23 22:26:42,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 180. [2019-11-23 22:26:42,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-11-23 22:26:42,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 211 transitions. [2019-11-23 22:26:42,729 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 211 transitions. Word has length 165 [2019-11-23 22:26:42,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:42,729 INFO L462 AbstractCegarLoop]: Abstraction has 180 states and 211 transitions. [2019-11-23 22:26:42,729 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 22:26:42,729 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 211 transitions. [2019-11-23 22:26:42,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-11-23 22:26:42,730 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:42,731 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:42,934 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:42,934 INFO L410 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:42,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:42,935 INFO L82 PathProgramCache]: Analyzing trace with hash -220326744, now seen corresponding path program 22 times [2019-11-23 22:26:42,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:42,935 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119689514] [2019-11-23 22:26:42,936 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:42,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:43,088 INFO L134 CoverageAnalysis]: Checked inductivity of 908 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 755 trivial. 0 not checked. [2019-11-23 22:26:43,088 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119689514] [2019-11-23 22:26:43,088 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112209087] [2019-11-23 22:26:43,089 INFO L92 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 [2019-11-23 22:26:43,208 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:26:43,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:43,210 INFO L255 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-23 22:26:43,213 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:43,253 INFO L134 CoverageAnalysis]: Checked inductivity of 908 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 755 trivial. 0 not checked. [2019-11-23 22:26:43,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:43,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-11-23 22:26:43,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025600542] [2019-11-23 22:26:43,255 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-23 22:26:43,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:43,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-23 22:26:43,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 22:26:43,256 INFO L87 Difference]: Start difference. First operand 180 states and 211 transitions. Second operand 13 states. [2019-11-23 22:26:43,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:43,388 INFO L93 Difference]: Finished difference Result 300 states and 360 transitions. [2019-11-23 22:26:43,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-23 22:26:43,388 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 179 [2019-11-23 22:26:43,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:43,390 INFO L225 Difference]: With dead ends: 300 [2019-11-23 22:26:43,390 INFO L226 Difference]: Without dead ends: 201 [2019-11-23 22:26:43,391 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 22:26:43,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2019-11-23 22:26:43,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 192. [2019-11-23 22:26:43,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2019-11-23 22:26:43,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 226 transitions. [2019-11-23 22:26:43,398 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 226 transitions. Word has length 179 [2019-11-23 22:26:43,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:43,399 INFO L462 AbstractCegarLoop]: Abstraction has 192 states and 226 transitions. [2019-11-23 22:26:43,399 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-23 22:26:43,399 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 226 transitions. [2019-11-23 22:26:43,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2019-11-23 22:26:43,400 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:43,400 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:43,603 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:43,604 INFO L410 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:43,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:43,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1883762499, now seen corresponding path program 23 times [2019-11-23 22:26:43,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:43,605 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438744954] [2019-11-23 22:26:43,605 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:43,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:43,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1019 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2019-11-23 22:26:43,812 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438744954] [2019-11-23 22:26:43,812 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289348619] [2019-11-23 22:26:43,812 INFO L92 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 [2019-11-23 22:26:46,230 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-11-23 22:26:46,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:46,242 INFO L255 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 22:26:46,245 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:46,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1019 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 970 trivial. 0 not checked. [2019-11-23 22:26:46,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:46,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2019-11-23 22:26:46,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612926603] [2019-11-23 22:26:46,338 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-23 22:26:46,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:46,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-23 22:26:46,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=298, Unknown=0, NotChecked=0, Total=420 [2019-11-23 22:26:46,338 INFO L87 Difference]: Start difference. First operand 192 states and 226 transitions. Second operand 21 states. [2019-11-23 22:26:46,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:46,563 INFO L93 Difference]: Finished difference Result 323 states and 389 transitions. [2019-11-23 22:26:46,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 22:26:46,563 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 191 [2019-11-23 22:26:46,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:46,564 INFO L225 Difference]: With dead ends: 323 [2019-11-23 22:26:46,564 INFO L226 Difference]: Without dead ends: 216 [2019-11-23 22:26:46,565 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=298, Unknown=0, NotChecked=0, Total=420 [2019-11-23 22:26:46,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2019-11-23 22:26:46,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 206. [2019-11-23 22:26:46,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2019-11-23 22:26:46,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 243 transitions. [2019-11-23 22:26:46,570 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 243 transitions. Word has length 191 [2019-11-23 22:26:46,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:46,570 INFO L462 AbstractCegarLoop]: Abstraction has 206 states and 243 transitions. [2019-11-23 22:26:46,570 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-23 22:26:46,571 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 243 transitions. [2019-11-23 22:26:46,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2019-11-23 22:26:46,572 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:46,572 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:46,778 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:46,779 INFO L410 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:46,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:46,779 INFO L82 PathProgramCache]: Analyzing trace with hash 29201244, now seen corresponding path program 24 times [2019-11-23 22:26:46,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:46,780 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675332417] [2019-11-23 22:26:46,780 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:46,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:46,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2019-11-23 22:26:46,968 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675332417] [2019-11-23 22:26:46,969 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817624840] [2019-11-23 22:26:46,969 INFO L92 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 [2019-11-23 22:26:47,920 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-23 22:26:47,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:47,923 INFO L255 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 43 conjunts are in the unsatisfiable core [2019-11-23 22:26:47,927 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:48,000 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-11-23 22:26:48,001 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-23 22:26:48,009 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-23 22:26:48,009 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-23 22:26:48,010 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2019-11-23 22:26:48,210 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-23 22:26:48,213 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-23 22:26:48,213 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 25 [2019-11-23 22:26:48,215 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-23 22:26:48,228 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-23 22:26:48,229 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-23 22:26:48,229 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:51, output treesize:22 [2019-11-23 22:26:48,415 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-23 22:26:48,416 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2019-11-23 22:26:48,417 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-23 22:26:48,426 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-23 22:26:48,426 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-23 22:26:48,427 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2019-11-23 22:26:48,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 58 proven. 62 refuted. 0 times theorem prover too weak. 1037 trivial. 0 not checked. [2019-11-23 22:26:48,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:48,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2019-11-23 22:26:48,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502726570] [2019-11-23 22:26:48,600 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-23 22:26:48,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:48,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-23 22:26:48,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=431, Unknown=0, NotChecked=0, Total=650 [2019-11-23 22:26:48,602 INFO L87 Difference]: Start difference. First operand 206 states and 243 transitions. Second operand 26 states. [2019-11-23 22:26:49,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:49,929 INFO L93 Difference]: Finished difference Result 516 states and 629 transitions. [2019-11-23 22:26:49,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-23 22:26:49,929 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 205 [2019-11-23 22:26:49,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:49,933 INFO L225 Difference]: With dead ends: 516 [2019-11-23 22:26:49,933 INFO L226 Difference]: Without dead ends: 399 [2019-11-23 22:26:49,935 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=863, Invalid=2107, Unknown=0, NotChecked=0, Total=2970 [2019-11-23 22:26:49,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2019-11-23 22:26:49,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 273. [2019-11-23 22:26:49,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2019-11-23 22:26:49,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 326 transitions. [2019-11-23 22:26:49,947 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 326 transitions. Word has length 205 [2019-11-23 22:26:49,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:49,947 INFO L462 AbstractCegarLoop]: Abstraction has 273 states and 326 transitions. [2019-11-23 22:26:49,947 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-23 22:26:49,947 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 326 transitions. [2019-11-23 22:26:49,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2019-11-23 22:26:49,948 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:49,949 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:50,153 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:50,154 INFO L410 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:50,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:50,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1569990905, now seen corresponding path program 1 times [2019-11-23 22:26:50,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:50,154 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062652595] [2019-11-23 22:26:50,154 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:50,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:50,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1292 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 1228 trivial. 0 not checked. [2019-11-23 22:26:50,395 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062652595] [2019-11-23 22:26:50,395 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460195265] [2019-11-23 22:26:50,395 INFO L94 rtionOrderModulation]: Keeping assertion order 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 [2019-11-23 22:26:50,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:50,541 INFO L255 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 22:26:50,545 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:50,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1292 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 1016 trivial. 0 not checked. [2019-11-23 22:26:50,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:50,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 24 [2019-11-23 22:26:50,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582652512] [2019-11-23 22:26:50,739 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-23 22:26:50,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:50,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-23 22:26:50,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2019-11-23 22:26:50,741 INFO L87 Difference]: Start difference. First operand 273 states and 326 transitions. Second operand 24 states. [2019-11-23 22:26:50,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:50,989 INFO L93 Difference]: Finished difference Result 437 states and 530 transitions. [2019-11-23 22:26:50,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-23 22:26:50,989 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 217 [2019-11-23 22:26:50,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:50,991 INFO L225 Difference]: With dead ends: 437 [2019-11-23 22:26:50,991 INFO L226 Difference]: Without dead ends: 304 [2019-11-23 22:26:50,992 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2019-11-23 22:26:50,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2019-11-23 22:26:51,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 291. [2019-11-23 22:26:51,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2019-11-23 22:26:51,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 348 transitions. [2019-11-23 22:26:51,004 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 348 transitions. Word has length 217 [2019-11-23 22:26:51,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:51,004 INFO L462 AbstractCegarLoop]: Abstraction has 291 states and 348 transitions. [2019-11-23 22:26:51,004 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-23 22:26:51,005 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 348 transitions. [2019-11-23 22:26:51,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2019-11-23 22:26:51,006 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:51,006 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:51,211 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:51,212 INFO L410 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:51,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:51,212 INFO L82 PathProgramCache]: Analyzing trace with hash -1672780526, now seen corresponding path program 2 times [2019-11-23 22:26:51,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:51,213 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531796787] [2019-11-23 22:26:51,213 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:51,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:51,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1456 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 1131 trivial. 0 not checked. [2019-11-23 22:26:51,520 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531796787] [2019-11-23 22:26:51,520 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365245501] [2019-11-23 22:26:51,520 INFO L92 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 [2019-11-23 22:26:51,672 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:26:51,672 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:51,675 INFO L255 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 22:26:51,678 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:51,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1456 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 1131 trivial. 0 not checked. [2019-11-23 22:26:51,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:51,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-11-23 22:26:51,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334985176] [2019-11-23 22:26:51,722 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 22:26:51,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:51,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 22:26:51,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 22:26:51,723 INFO L87 Difference]: Start difference. First operand 291 states and 348 transitions. Second operand 17 states. [2019-11-23 22:26:51,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:51,918 INFO L93 Difference]: Finished difference Result 462 states and 560 transitions. [2019-11-23 22:26:51,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-23 22:26:51,919 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 231 [2019-11-23 22:26:51,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:51,922 INFO L225 Difference]: With dead ends: 462 [2019-11-23 22:26:51,922 INFO L226 Difference]: Without dead ends: 319 [2019-11-23 22:26:51,923 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 22:26:51,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2019-11-23 22:26:51,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 307. [2019-11-23 22:26:51,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2019-11-23 22:26:51,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 368 transitions. [2019-11-23 22:26:51,934 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 368 transitions. Word has length 231 [2019-11-23 22:26:51,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:51,934 INFO L462 AbstractCegarLoop]: Abstraction has 307 states and 368 transitions. [2019-11-23 22:26:51,934 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 22:26:51,934 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 368 transitions. [2019-11-23 22:26:51,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-11-23 22:26:51,936 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:51,936 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:52,139 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:52,140 INFO L410 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:52,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:52,140 INFO L82 PathProgramCache]: Analyzing trace with hash -260559443, now seen corresponding path program 3 times [2019-11-23 22:26:52,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:52,141 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793416056] [2019-11-23 22:26:52,141 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:52,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:52,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1615 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 1534 trivial. 0 not checked. [2019-11-23 22:26:52,444 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793416056] [2019-11-23 22:26:52,444 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999146827] [2019-11-23 22:26:52,444 INFO L92 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 [2019-11-23 22:26:52,816 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-23 22:26:52,816 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:52,819 INFO L255 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-23 22:26:52,823 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:52,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1615 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 1534 trivial. 0 not checked. [2019-11-23 22:26:52,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:52,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-11-23 22:26:52,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907923062] [2019-11-23 22:26:52,880 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-23 22:26:52,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:52,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-23 22:26:52,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 22:26:52,881 INFO L87 Difference]: Start difference. First operand 307 states and 368 transitions. Second operand 13 states. [2019-11-23 22:26:52,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:52,951 INFO L93 Difference]: Finished difference Result 373 states and 449 transitions. [2019-11-23 22:26:52,952 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-23 22:26:52,952 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 243 [2019-11-23 22:26:52,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:52,956 INFO L225 Difference]: With dead ends: 373 [2019-11-23 22:26:52,957 INFO L226 Difference]: Without dead ends: 310 [2019-11-23 22:26:52,957 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 22:26:52,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2019-11-23 22:26:52,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 309. [2019-11-23 22:26:52,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2019-11-23 22:26:52,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 370 transitions. [2019-11-23 22:26:52,967 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 370 transitions. Word has length 243 [2019-11-23 22:26:52,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:52,968 INFO L462 AbstractCegarLoop]: Abstraction has 309 states and 370 transitions. [2019-11-23 22:26:52,968 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-23 22:26:52,968 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 370 transitions. [2019-11-23 22:26:52,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2019-11-23 22:26:52,969 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:52,970 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:53,176 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:53,177 INFO L410 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:53,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:53,177 INFO L82 PathProgramCache]: Analyzing trace with hash -601711829, now seen corresponding path program 4 times [2019-11-23 22:26:53,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:53,177 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189085677] [2019-11-23 22:26:53,177 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:53,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:53,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1534 trivial. 0 not checked. [2019-11-23 22:26:53,456 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189085677] [2019-11-23 22:26:53,456 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459939591] [2019-11-23 22:26:53,456 INFO L92 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 [2019-11-23 22:26:53,627 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:26:53,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:26:53,630 INFO L255 TraceCheckSpWp]: Trace formula consists of 749 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-23 22:26:53,635 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:26:53,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 1256 trivial. 0 not checked. [2019-11-23 22:26:53,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:26:53,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17] total 28 [2019-11-23 22:26:53,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441402873] [2019-11-23 22:26:53,898 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-23 22:26:53,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:26:53,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-23 22:26:53,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=543, Unknown=0, NotChecked=0, Total=756 [2019-11-23 22:26:53,899 INFO L87 Difference]: Start difference. First operand 309 states and 370 transitions. Second operand 28 states. [2019-11-23 22:26:54,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:26:54,254 INFO L93 Difference]: Finished difference Result 493 states and 598 transitions. [2019-11-23 22:26:54,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-23 22:26:54,254 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 245 [2019-11-23 22:26:54,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:26:54,256 INFO L225 Difference]: With dead ends: 493 [2019-11-23 22:26:54,256 INFO L226 Difference]: Without dead ends: 340 [2019-11-23 22:26:54,257 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=213, Invalid=543, Unknown=0, NotChecked=0, Total=756 [2019-11-23 22:26:54,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2019-11-23 22:26:54,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 327. [2019-11-23 22:26:54,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2019-11-23 22:26:54,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 392 transitions. [2019-11-23 22:26:54,270 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 392 transitions. Word has length 245 [2019-11-23 22:26:54,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:26:54,270 INFO L462 AbstractCegarLoop]: Abstraction has 327 states and 392 transitions. [2019-11-23 22:26:54,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-23 22:26:54,270 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 392 transitions. [2019-11-23 22:26:54,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2019-11-23 22:26:54,272 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:26:54,272 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:26:54,476 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:26:54,477 INFO L410 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:26:54,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:26:54,477 INFO L82 PathProgramCache]: Analyzing trace with hash 220293956, now seen corresponding path program 5 times [2019-11-23 22:26:54,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:26:54,477 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200822096] [2019-11-23 22:26:54,478 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:26:54,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:26:54,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1826 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 1391 trivial. 0 not checked. [2019-11-23 22:26:54,823 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200822096] [2019-11-23 22:26:54,823 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321242085] [2019-11-23 22:26:54,823 INFO L92 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 [2019-11-23 22:27:00,582 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-11-23 22:27:00,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:00,592 INFO L255 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-23 22:27:00,595 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:00,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1826 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 1391 trivial. 0 not checked. [2019-11-23 22:27:00,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:00,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-11-23 22:27:00,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726262158] [2019-11-23 22:27:00,655 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-23 22:27:00,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:00,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-23 22:27:00,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 22:27:00,656 INFO L87 Difference]: Start difference. First operand 327 states and 392 transitions. Second operand 19 states. [2019-11-23 22:27:00,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:00,891 INFO L93 Difference]: Finished difference Result 518 states and 628 transitions. [2019-11-23 22:27:00,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 22:27:00,891 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 259 [2019-11-23 22:27:00,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:00,893 INFO L225 Difference]: With dead ends: 518 [2019-11-23 22:27:00,893 INFO L226 Difference]: Without dead ends: 355 [2019-11-23 22:27:00,895 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 22:27:00,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2019-11-23 22:27:00,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 343. [2019-11-23 22:27:00,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 343 states. [2019-11-23 22:27:00,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 412 transitions. [2019-11-23 22:27:00,907 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 412 transitions. Word has length 259 [2019-11-23 22:27:00,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:00,907 INFO L462 AbstractCegarLoop]: Abstraction has 343 states and 412 transitions. [2019-11-23 22:27:00,907 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-23 22:27:00,907 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 412 transitions. [2019-11-23 22:27:00,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2019-11-23 22:27:00,909 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:00,909 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:01,110 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:01,110 INFO L410 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:01,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:01,111 INFO L82 PathProgramCache]: Analyzing trace with hash -302340897, now seen corresponding path program 6 times [2019-11-23 22:27:01,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:01,111 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53218581] [2019-11-23 22:27:01,111 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:01,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:01,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2009 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1888 trivial. 0 not checked. [2019-11-23 22:27:01,372 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53218581] [2019-11-23 22:27:01,372 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032405430] [2019-11-23 22:27:01,372 INFO L92 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 [2019-11-23 22:27:07,617 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2019-11-23 22:27:07,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:07,626 INFO L255 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-23 22:27:07,630 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:07,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2009 backedges. 21 proven. 496 refuted. 0 times theorem prover too weak. 1492 trivial. 0 not checked. [2019-11-23 22:27:07,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:07,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 33 [2019-11-23 22:27:07,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674695900] [2019-11-23 22:27:07,969 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-23 22:27:07,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:07,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-23 22:27:07,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=766, Unknown=0, NotChecked=0, Total=1056 [2019-11-23 22:27:07,970 INFO L87 Difference]: Start difference. First operand 343 states and 412 transitions. Second operand 33 states. [2019-11-23 22:27:08,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:08,613 INFO L93 Difference]: Finished difference Result 546 states and 664 transitions. [2019-11-23 22:27:08,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-11-23 22:27:08,614 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 271 [2019-11-23 22:27:08,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:08,616 INFO L225 Difference]: With dead ends: 546 [2019-11-23 22:27:08,616 INFO L226 Difference]: Without dead ends: 375 [2019-11-23 22:27:08,617 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=630, Invalid=1820, Unknown=0, NotChecked=0, Total=2450 [2019-11-23 22:27:08,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2019-11-23 22:27:08,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 363. [2019-11-23 22:27:08,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 363 states. [2019-11-23 22:27:08,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 436 transitions. [2019-11-23 22:27:08,629 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 436 transitions. Word has length 271 [2019-11-23 22:27:08,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:08,630 INFO L462 AbstractCegarLoop]: Abstraction has 363 states and 436 transitions. [2019-11-23 22:27:08,630 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-23 22:27:08,630 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 436 transitions. [2019-11-23 22:27:08,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2019-11-23 22:27:08,631 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:08,632 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 16, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:08,836 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:08,836 INFO L410 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:08,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:08,836 INFO L82 PathProgramCache]: Analyzing trace with hash 991713654, now seen corresponding path program 7 times [2019-11-23 22:27:08,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:08,837 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378921924] [2019-11-23 22:27:08,837 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:08,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:09,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2252 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 2083 trivial. 0 not checked. [2019-11-23 22:27:09,149 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378921924] [2019-11-23 22:27:09,149 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689234340] [2019-11-23 22:27:09,149 INFO L92 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 [2019-11-23 22:27:09,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:09,303 INFO L255 TraceCheckSpWp]: Trace formula consists of 869 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-23 22:27:09,306 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:09,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2252 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 1691 trivial. 0 not checked. [2019-11-23 22:27:09,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:09,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 34 [2019-11-23 22:27:09,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142106960] [2019-11-23 22:27:09,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-23 22:27:09,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:09,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-23 22:27:09,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=813, Unknown=0, NotChecked=0, Total=1122 [2019-11-23 22:27:09,647 INFO L87 Difference]: Start difference. First operand 363 states and 436 transitions. Second operand 34 states. [2019-11-23 22:27:10,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:10,074 INFO L93 Difference]: Finished difference Result 577 states and 700 transitions. [2019-11-23 22:27:10,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-23 22:27:10,075 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 287 [2019-11-23 22:27:10,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:10,078 INFO L225 Difference]: With dead ends: 577 [2019-11-23 22:27:10,079 INFO L226 Difference]: Without dead ends: 394 [2019-11-23 22:27:10,080 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=309, Invalid=813, Unknown=0, NotChecked=0, Total=1122 [2019-11-23 22:27:10,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2019-11-23 22:27:10,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 381. [2019-11-23 22:27:10,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 381 states. [2019-11-23 22:27:10,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 458 transitions. [2019-11-23 22:27:10,090 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 458 transitions. Word has length 287 [2019-11-23 22:27:10,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:10,091 INFO L462 AbstractCegarLoop]: Abstraction has 381 states and 458 transitions. [2019-11-23 22:27:10,091 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-23 22:27:10,091 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 458 transitions. [2019-11-23 22:27:10,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2019-11-23 22:27:10,093 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:10,093 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 17, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:10,297 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:10,297 INFO L410 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:10,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:10,298 INFO L82 PathProgramCache]: Analyzing trace with hash -426788977, now seen corresponding path program 8 times [2019-11-23 22:27:10,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:10,298 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846982642] [2019-11-23 22:27:10,299 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:10,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:10,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2486 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 1856 trivial. 0 not checked. [2019-11-23 22:27:10,675 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846982642] [2019-11-23 22:27:10,675 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729083] [2019-11-23 22:27:10,675 INFO L92 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 [2019-11-23 22:27:10,852 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:27:10,852 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:10,854 INFO L255 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-23 22:27:10,858 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:10,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2486 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 1856 trivial. 0 not checked. [2019-11-23 22:27:10,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:10,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2019-11-23 22:27:10,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886732974] [2019-11-23 22:27:10,924 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-23 22:27:10,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:10,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-23 22:27:10,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 22:27:10,925 INFO L87 Difference]: Start difference. First operand 381 states and 458 transitions. Second operand 22 states. [2019-11-23 22:27:11,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:11,196 INFO L93 Difference]: Finished difference Result 602 states and 730 transitions. [2019-11-23 22:27:11,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 22:27:11,197 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 301 [2019-11-23 22:27:11,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:11,200 INFO L225 Difference]: With dead ends: 602 [2019-11-23 22:27:11,200 INFO L226 Difference]: Without dead ends: 409 [2019-11-23 22:27:11,201 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 22:27:11,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2019-11-23 22:27:11,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 397. [2019-11-23 22:27:11,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2019-11-23 22:27:11,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 478 transitions. [2019-11-23 22:27:11,211 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 478 transitions. Word has length 301 [2019-11-23 22:27:11,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:11,212 INFO L462 AbstractCegarLoop]: Abstraction has 397 states and 478 transitions. [2019-11-23 22:27:11,212 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-23 22:27:11,212 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 478 transitions. [2019-11-23 22:27:11,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2019-11-23 22:27:11,214 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:11,214 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 18, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:11,417 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:11,418 INFO L410 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:11,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:11,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1887921494, now seen corresponding path program 9 times [2019-11-23 22:27:11,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:11,419 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464564209] [2019-11-23 22:27:11,419 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:11,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:11,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2705 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2019-11-23 22:27:11,865 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464564209] [2019-11-23 22:27:11,865 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319701213] [2019-11-23 22:27:11,865 INFO L92 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 [2019-11-23 22:27:13,208 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-11-23 22:27:13,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:13,212 INFO L255 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-23 22:27:13,217 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:13,473 INFO L134 CoverageAnalysis]: Checked inductivity of 2705 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2509 trivial. 0 not checked. [2019-11-23 22:27:13,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:13,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17] total 37 [2019-11-23 22:27:13,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726996823] [2019-11-23 22:27:13,474 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-23 22:27:13,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:13,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-23 22:27:13,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=966, Unknown=0, NotChecked=0, Total=1332 [2019-11-23 22:27:13,475 INFO L87 Difference]: Start difference. First operand 397 states and 478 transitions. Second operand 37 states. [2019-11-23 22:27:13,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:13,859 INFO L93 Difference]: Finished difference Result 617 states and 748 transitions. [2019-11-23 22:27:13,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-23 22:27:13,859 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 313 [2019-11-23 22:27:13,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:13,862 INFO L225 Difference]: With dead ends: 617 [2019-11-23 22:27:13,862 INFO L226 Difference]: Without dead ends: 416 [2019-11-23 22:27:13,864 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=366, Invalid=966, Unknown=0, NotChecked=0, Total=1332 [2019-11-23 22:27:13,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2019-11-23 22:27:13,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 415. [2019-11-23 22:27:13,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 415 states. [2019-11-23 22:27:13,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 500 transitions. [2019-11-23 22:27:13,883 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 500 transitions. Word has length 313 [2019-11-23 22:27:13,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:13,884 INFO L462 AbstractCegarLoop]: Abstraction has 415 states and 500 transitions. [2019-11-23 22:27:13,884 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-23 22:27:13,884 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 500 transitions. [2019-11-23 22:27:13,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2019-11-23 22:27:13,903 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:13,903 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:14,111 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:14,112 INFO L410 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:14,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:14,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1687374659, now seen corresponding path program 10 times [2019-11-23 22:27:14,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:14,116 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628640741] [2019-11-23 22:27:14,116 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:14,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:14,652 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:14,652 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628640741] [2019-11-23 22:27:14,653 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492034681] [2019-11-23 22:27:14,653 INFO L92 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 [2019-11-23 22:27:14,927 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:27:14,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:14,932 INFO L255 TraceCheckSpWp]: Trace formula consists of 985 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-23 22:27:14,937 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:15,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:15,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:15,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-11-23 22:27:15,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096598619] [2019-11-23 22:27:15,014 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-23 22:27:15,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:15,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-23 22:27:15,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 22:27:15,015 INFO L87 Difference]: Start difference. First operand 415 states and 500 transitions. Second operand 19 states. [2019-11-23 22:27:15,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:15,081 INFO L93 Difference]: Finished difference Result 505 states and 611 transitions. [2019-11-23 22:27:15,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 22:27:15,082 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 327 [2019-11-23 22:27:15,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:15,084 INFO L225 Difference]: With dead ends: 505 [2019-11-23 22:27:15,084 INFO L226 Difference]: Without dead ends: 418 [2019-11-23 22:27:15,085 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 22:27:15,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2019-11-23 22:27:15,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 417. [2019-11-23 22:27:15,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 417 states. [2019-11-23 22:27:15,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 502 transitions. [2019-11-23 22:27:15,096 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 502 transitions. Word has length 327 [2019-11-23 22:27:15,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:15,096 INFO L462 AbstractCegarLoop]: Abstraction has 417 states and 502 transitions. [2019-11-23 22:27:15,097 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-23 22:27:15,097 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 502 transitions. [2019-11-23 22:27:15,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2019-11-23 22:27:15,098 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:15,099 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:15,303 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:15,304 INFO L410 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:15,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:15,304 INFO L82 PathProgramCache]: Analyzing trace with hash 1042833857, now seen corresponding path program 11 times [2019-11-23 22:27:15,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:15,305 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633714862] [2019-11-23 22:27:15,305 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:15,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:15,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2996 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:15,767 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633714862] [2019-11-23 22:27:15,767 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712087267] [2019-11-23 22:27:15,768 INFO L92 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 [2019-11-23 22:27:42,939 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-11-23 22:27:42,940 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:42,964 INFO L255 TraceCheckSpWp]: Trace formula consists of 989 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 22:27:42,967 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:43,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2996 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:43,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:43,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-11-23 22:27:43,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996415170] [2019-11-23 22:27:43,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-23 22:27:43,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:43,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-23 22:27:43,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:27:43,037 INFO L87 Difference]: Start difference. First operand 417 states and 502 transitions. Second operand 20 states. [2019-11-23 22:27:43,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:43,111 INFO L93 Difference]: Finished difference Result 507 states and 613 transitions. [2019-11-23 22:27:43,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 22:27:43,111 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 329 [2019-11-23 22:27:43,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:43,114 INFO L225 Difference]: With dead ends: 507 [2019-11-23 22:27:43,114 INFO L226 Difference]: Without dead ends: 420 [2019-11-23 22:27:43,114 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:27:43,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2019-11-23 22:27:43,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 419. [2019-11-23 22:27:43,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2019-11-23 22:27:43,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 504 transitions. [2019-11-23 22:27:43,124 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 504 transitions. Word has length 329 [2019-11-23 22:27:43,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:43,125 INFO L462 AbstractCegarLoop]: Abstraction has 419 states and 504 transitions. [2019-11-23 22:27:43,125 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-23 22:27:43,125 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 504 transitions. [2019-11-23 22:27:43,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2019-11-23 22:27:43,127 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:43,127 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:43,340 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:43,341 INFO L410 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:43,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:43,341 INFO L82 PathProgramCache]: Analyzing trace with hash 114413759, now seen corresponding path program 12 times [2019-11-23 22:27:43,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:43,341 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038316884] [2019-11-23 22:27:43,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:43,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:43,823 INFO L134 CoverageAnalysis]: Checked inductivity of 3029 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:43,824 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038316884] [2019-11-23 22:27:43,824 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343362073] [2019-11-23 22:27:43,824 INFO L92 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 [2019-11-23 22:27:52,631 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2019-11-23 22:27:52,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:27:52,647 INFO L255 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 37 conjunts are in the unsatisfiable core [2019-11-23 22:27:52,651 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:52,725 INFO L134 CoverageAnalysis]: Checked inductivity of 3029 backedges. 39 proven. 289 refuted. 0 times theorem prover too weak. 2701 trivial. 0 not checked. [2019-11-23 22:27:52,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:52,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 22] total 23 [2019-11-23 22:27:52,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340318389] [2019-11-23 22:27:52,726 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-23 22:27:52,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:52,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-23 22:27:52,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=291, Unknown=0, NotChecked=0, Total=506 [2019-11-23 22:27:52,727 INFO L87 Difference]: Start difference. First operand 419 states and 504 transitions. Second operand 23 states. [2019-11-23 22:27:53,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:53,093 INFO L93 Difference]: Finished difference Result 509 states and 615 transitions. [2019-11-23 22:27:53,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-23 22:27:53,098 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 331 [2019-11-23 22:27:53,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:53,100 INFO L225 Difference]: With dead ends: 509 [2019-11-23 22:27:53,101 INFO L226 Difference]: Without dead ends: 422 [2019-11-23 22:27:53,101 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=594, Invalid=1046, Unknown=0, NotChecked=0, Total=1640 [2019-11-23 22:27:53,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2019-11-23 22:27:53,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 421. [2019-11-23 22:27:53,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 421 states. [2019-11-23 22:27:53,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 506 transitions. [2019-11-23 22:27:53,112 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 506 transitions. Word has length 331 [2019-11-23 22:27:53,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:53,113 INFO L462 AbstractCegarLoop]: Abstraction has 421 states and 506 transitions. [2019-11-23 22:27:53,113 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-23 22:27:53,113 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 506 transitions. [2019-11-23 22:27:53,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2019-11-23 22:27:53,115 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:53,115 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:53,325 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:53,325 INFO L410 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:53,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:53,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1255897149, now seen corresponding path program 13 times [2019-11-23 22:27:53,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:53,326 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352095599] [2019-11-23 22:27:53,326 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:53,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:53,931 INFO L134 CoverageAnalysis]: Checked inductivity of 3064 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:53,932 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352095599] [2019-11-23 22:27:53,932 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458179165] [2019-11-23 22:27:53,932 INFO L92 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 [2019-11-23 22:27:54,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:27:54,211 INFO L255 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-23 22:27:54,217 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:27:54,350 INFO L134 CoverageAnalysis]: Checked inductivity of 3064 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2019-11-23 22:27:54,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:27:54,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2019-11-23 22:27:54,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877673568] [2019-11-23 22:27:54,353 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-23 22:27:54,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:27:54,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-23 22:27:54,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 22:27:54,354 INFO L87 Difference]: Start difference. First operand 421 states and 506 transitions. Second operand 22 states. [2019-11-23 22:27:54,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:27:54,458 INFO L93 Difference]: Finished difference Result 510 states and 616 transitions. [2019-11-23 22:27:54,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 22:27:54,458 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 333 [2019-11-23 22:27:54,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:27:54,462 INFO L225 Difference]: With dead ends: 510 [2019-11-23 22:27:54,462 INFO L226 Difference]: Without dead ends: 423 [2019-11-23 22:27:54,463 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 22:27:54,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2019-11-23 22:27:54,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 423. [2019-11-23 22:27:54,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 423 states. [2019-11-23 22:27:54,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 508 transitions. [2019-11-23 22:27:54,478 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 508 transitions. Word has length 333 [2019-11-23 22:27:54,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:27:54,479 INFO L462 AbstractCegarLoop]: Abstraction has 423 states and 508 transitions. [2019-11-23 22:27:54,479 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-23 22:27:54,479 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 508 transitions. [2019-11-23 22:27:54,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2019-11-23 22:27:54,481 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:27:54,481 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:27:54,686 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:27:54,687 INFO L410 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:27:54,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:27:54,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1290192837, now seen corresponding path program 14 times [2019-11-23 22:27:54,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:27:54,687 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624297050] [2019-11-23 22:27:54,688 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:27:55,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat