/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/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:46:07,916 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:46:07,919 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:46:07,945 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:46:07,945 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:46:07,947 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:46:07,948 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:46:07,950 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:46:07,951 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:46:07,955 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:46:07,956 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:46:07,959 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:46:07,959 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:46:07,960 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:46:07,961 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:46:07,963 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:46:07,964 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:46:07,965 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:46:07,969 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:46:07,971 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:46:07,973 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:46:07,976 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:46:07,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:46:07,978 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:46:07,981 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:46:07,999 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 [2020-08-22 16:46:08,057 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:46:08,060 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:46:08,061 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:46:08,062 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:46:08,062 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:46:08,062 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:46:08,062 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:46:08,062 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:46:08,063 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:46:08,063 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:46:08,064 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:46:08,064 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:46:08,064 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:46:08,064 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:46:08,064 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:46:08,065 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:46:08,066 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:46:08,066 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:46:08,066 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:46:08,066 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:46:08,067 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:46:08,067 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:46:08,067 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:46:08,067 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:46:08,067 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:46:08,068 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:46:08,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:46:08,068 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:46:08,068 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:46:08,068 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:46:08,439 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:46:08,453 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:46:08,457 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:46:08,458 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:46:08,459 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:46:08,460 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-22 16:46:08,533 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2cb54afa7/9a072c463aef41cd90bb5d10fbc85db3/FLAG4e73886b6 [2020-08-22 16:46:09,039 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:46:09,040 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-22 16:46:09,047 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2cb54afa7/9a072c463aef41cd90bb5d10fbc85db3/FLAG4e73886b6 [2020-08-22 16:46:09,377 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2cb54afa7/9a072c463aef41cd90bb5d10fbc85db3 [2020-08-22 16:46:09,391 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:46:09,394 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:46:09,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:46:09,395 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:46:09,399 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:46:09,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,404 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ce4c944 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09, skipping insertion in model container [2020-08-22 16:46:09,404 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:46:09,432 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:46:09,626 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:46:09,636 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:46:09,659 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:46:09,675 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:46:09,676 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09 WrapperNode [2020-08-22 16:46:09,676 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:46:09,677 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:46:09,677 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:46:09,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:46:09,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,811 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,811 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,819 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,824 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,826 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (1/1) ... [2020-08-22 16:46:09,828 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:46:09,829 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:46:09,829 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:46:09,829 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:46:09,830 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (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 [2020-08-22 16:46:09,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:46:09,900 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:46:09,900 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-22 16:46:09,900 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:46:09,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:46:09,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 16:46:09,900 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-22 16:46:09,901 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 16:46:09,901 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:46:09,901 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 16:46:09,901 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 16:46:09,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 16:46:09,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:46:09,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:46:10,206 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:46:10,207 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-22 16:46:10,211 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:46:10 BoogieIcfgContainer [2020-08-22 16:46:10,211 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:46:10,224 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:46:10,224 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:46:10,233 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:46:10,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:46:09" (1/3) ... [2020-08-22 16:46:10,235 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@465ce80c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:46:10, skipping insertion in model container [2020-08-22 16:46:10,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:46:09" (2/3) ... [2020-08-22 16:46:10,235 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@465ce80c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:46:10, skipping insertion in model container [2020-08-22 16:46:10,236 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:46:10" (3/3) ... [2020-08-22 16:46:10,239 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-22 16:46:10,266 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:46:10,276 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:46:10,289 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:46:10,310 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:46:10,310 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:46:10,310 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:46:10,310 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:46:10,310 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:46:10,311 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:46:10,311 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:46:10,311 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:46:10,328 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-22 16:46:10,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 16:46:10,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:10,335 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:10,335 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:10,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:10,341 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-22 16:46:10,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:10,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584094650] [2020-08-22 16:46:10,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:10,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:10,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:10,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:10,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 16:46:10,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:10,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:10,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584094650] [2020-08-22 16:46:10,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:46:10,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 16:46:10,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374750872] [2020-08-22 16:46:10,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 16:46:10,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:10,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 16:46:10,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 16:46:10,620 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-22 16:46:10,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:10,709 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-22 16:46:10,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 16:46:10,712 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-22 16:46:10,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:10,727 INFO L225 Difference]: With dead ends: 42 [2020-08-22 16:46:10,727 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 16:46:10,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 16:46:10,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 16:46:10,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 16:46:10,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 16:46:10,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-22 16:46:10,768 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-22 16:46:10,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:10,768 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-22 16:46:10,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 16:46:10,769 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-22 16:46:10,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 16:46:10,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:10,770 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:10,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:46:10,771 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:10,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:10,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-22 16:46:10,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:10,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78212388] [2020-08-22 16:46:10,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:10,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:10,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:10,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:10,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 16:46:10,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:10,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:10,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78212388] [2020-08-22 16:46:10,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:46:10,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 16:46:10,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997341120] [2020-08-22 16:46:10,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 16:46:10,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:10,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 16:46:10,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 16:46:10,865 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-22 16:46:10,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:10,923 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-22 16:46:10,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 16:46:10,924 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-22 16:46:10,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:10,925 INFO L225 Difference]: With dead ends: 34 [2020-08-22 16:46:10,925 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 16:46:10,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 16:46:10,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 16:46:10,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-22 16:46:10,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 16:46:10,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-22 16:46:10,934 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-22 16:46:10,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:10,935 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-22 16:46:10,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 16:46:10,935 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-22 16:46:10,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 16:46:10,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:10,936 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:10,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 16:46:10,937 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:10,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:10,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-22 16:46:10,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:10,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722785482] [2020-08-22 16:46:10,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:10,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:11,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-22 16:46:11,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:11,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722785482] [2020-08-22 16:46:11,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339748265] [2020-08-22 16:46:11,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:11,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-08-22 16:46:11,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:11,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:11,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:11,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-08-22 16:46:11,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413696461] [2020-08-22 16:46:11,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 16:46:11,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:11,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 16:46:11,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:46:11,189 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-08-22 16:46:11,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:11,253 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-22 16:46:11,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:46:11,253 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-22 16:46:11,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:11,254 INFO L225 Difference]: With dead ends: 36 [2020-08-22 16:46:11,255 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 16:46:11,256 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:46:11,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 16:46:11,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-22 16:46:11,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 16:46:11,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-22 16:46:11,262 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-22 16:46:11,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:11,263 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-22 16:46:11,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 16:46:11,263 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-22 16:46:11,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 16:46:11,264 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:11,264 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:11,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-08-22 16:46:11,466 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:11,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:11,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-22 16:46:11,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:11,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574242475] [2020-08-22 16:46:11,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:11,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:11,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 16:46:11,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:11,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:11,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574242475] [2020-08-22 16:46:11,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326254227] [2020-08-22 16:46:11,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:11,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:46:11,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:11,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2020-08-22 16:46:11,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:11,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:11,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-08-22 16:46:11,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466296248] [2020-08-22 16:46:11,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:46:11,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:11,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:46:11,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:46:11,665 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 7 states. [2020-08-22 16:46:11,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:11,724 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-22 16:46:11,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:46:11,724 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-22 16:46:11,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:11,725 INFO L225 Difference]: With dead ends: 38 [2020-08-22 16:46:11,726 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 16:46:11,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:46:11,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 16:46:11,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-22 16:46:11,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 16:46:11,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-22 16:46:11,732 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-22 16:46:11,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:11,733 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-22 16:46:11,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:46:11,733 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-22 16:46:11,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 16:46:11,734 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:11,734 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:11,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:11,947 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:11,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:11,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-22 16:46:11,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:11,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960201032] [2020-08-22 16:46:11,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:11,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:12,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:12,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:12,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-22 16:46:12,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:12,078 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:12,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960201032] [2020-08-22 16:46:12,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617438808] [2020-08-22 16:46:12,079 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:12,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-08-22 16:46:12,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:12,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2020-08-22 16:46:12,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:12,194 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:12,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:12,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-08-22 16:46:12,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583018555] [2020-08-22 16:46:12,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 16:46:12,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:12,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 16:46:12,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:46:12,197 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2020-08-22 16:46:12,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:12,270 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-22 16:46:12,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 16:46:12,271 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-22 16:46:12,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:12,272 INFO L225 Difference]: With dead ends: 40 [2020-08-22 16:46:12,272 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 16:46:12,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:46:12,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 16:46:12,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-22 16:46:12,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 16:46:12,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-22 16:46:12,278 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-22 16:46:12,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:12,279 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-22 16:46:12,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 16:46:12,279 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-22 16:46:12,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 16:46:12,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:12,280 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:12,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:12,493 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:12,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:12,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-22 16:46:12,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:12,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517317649] [2020-08-22 16:46:12,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:12,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:12,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:12,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-22 16:46:12,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:12,625 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:12,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517317649] [2020-08-22 16:46:12,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728675904] [2020-08-22 16:46:12,626 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:12,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:46:12,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:12,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:46:12,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:12,715 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:12,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:12,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-08-22 16:46:12,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24080454] [2020-08-22 16:46:12,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 16:46:12,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:12,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 16:46:12,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:46:12,718 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-22 16:46:12,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:12,795 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-22 16:46:12,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:46:12,797 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-22 16:46:12,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:12,798 INFO L225 Difference]: With dead ends: 42 [2020-08-22 16:46:12,798 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 16:46:12,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:46:12,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 16:46:12,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-22 16:46:12,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 16:46:12,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-22 16:46:12,807 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-22 16:46:12,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:12,807 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-22 16:46:12,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 16:46:12,808 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-22 16:46:12,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 16:46:12,809 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:12,809 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:13,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:13,024 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:13,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:13,025 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-22 16:46:13,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:13,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719718033] [2020-08-22 16:46:13,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:13,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:13,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:13,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:13,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-22 16:46:13,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:13,119 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:13,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719718033] [2020-08-22 16:46:13,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347944222] [2020-08-22 16:46:13,120 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:13,200 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-08-22 16:46:13,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:13,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2020-08-22 16:46:13,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:13,242 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:13,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:13,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-08-22 16:46:13,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546856097] [2020-08-22 16:46:13,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 16:46:13,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:13,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 16:46:13,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:46:13,246 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2020-08-22 16:46:13,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:13,328 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-22 16:46:13,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 16:46:13,328 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-22 16:46:13,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:13,330 INFO L225 Difference]: With dead ends: 44 [2020-08-22 16:46:13,331 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 16:46:13,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:46:13,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 16:46:13,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-22 16:46:13,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 16:46:13,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-22 16:46:13,342 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-22 16:46:13,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:13,342 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-22 16:46:13,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 16:46:13,343 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-22 16:46:13,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 16:46:13,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:13,347 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:13,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-08-22 16:46:13,562 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:13,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:13,563 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-22 16:46:13,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:13,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721710845] [2020-08-22 16:46:13,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:13,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:13,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:13,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:13,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-22 16:46:13,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:13,699 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:13,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721710845] [2020-08-22 16:46:13,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729171099] [2020-08-22 16:46:13,700 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:13,858 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-08-22 16:46:13,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:13,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 8 conjunts are in the unsatisfiable core [2020-08-22 16:46:13,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:13,914 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:13,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:13,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2020-08-22 16:46:13,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533501298] [2020-08-22 16:46:13,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 16:46:13,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:13,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 16:46:13,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:46:13,918 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 11 states. [2020-08-22 16:46:13,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:13,994 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-22 16:46:14,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 16:46:14,003 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-22 16:46:14,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:14,005 INFO L225 Difference]: With dead ends: 46 [2020-08-22 16:46:14,005 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 16:46:14,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:46:14,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 16:46:14,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-22 16:46:14,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 16:46:14,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-22 16:46:14,015 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-22 16:46:14,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:14,015 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-22 16:46:14,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 16:46:14,016 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-22 16:46:14,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 16:46:14,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:14,017 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:14,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:14,219 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:14,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:14,220 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-22 16:46:14,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:14,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092406216] [2020-08-22 16:46:14,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:14,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:14,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-22 16:46:14,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:14,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092406216] [2020-08-22 16:46:14,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279708119] [2020-08-22 16:46:14,332 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:14,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 9 conjunts are in the unsatisfiable core [2020-08-22 16:46:14,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:14,430 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:14,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:14,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2020-08-22 16:46:14,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414997448] [2020-08-22 16:46:14,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 16:46:14,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:14,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 16:46:14,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-22 16:46:14,433 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 12 states. [2020-08-22 16:46:14,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:14,550 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-22 16:46:14,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 16:46:14,550 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-22 16:46:14,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:14,551 INFO L225 Difference]: With dead ends: 48 [2020-08-22 16:46:14,552 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 16:46:14,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-22 16:46:14,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 16:46:14,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-22 16:46:14,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 16:46:14,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-22 16:46:14,558 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-22 16:46:14,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:14,559 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-22 16:46:14,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 16:46:14,559 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-22 16:46:14,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 16:46:14,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:14,560 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:14,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:14,767 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:14,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:14,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-22 16:46:14,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:14,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360269253] [2020-08-22 16:46:14,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:14,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:14,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-22 16:46:14,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:14,960 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:14,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360269253] [2020-08-22 16:46:14,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406640008] [2020-08-22 16:46:14,961 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:15,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:46:15,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:15,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-08-22 16:46:15,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:15,060 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:15,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:15,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-08-22 16:46:15,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459658695] [2020-08-22 16:46:15,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 16:46:15,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:15,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 16:46:15,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-22 16:46:15,063 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 13 states. [2020-08-22 16:46:15,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:15,142 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-22 16:46:15,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 16:46:15,143 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-22 16:46:15,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:15,144 INFO L225 Difference]: With dead ends: 50 [2020-08-22 16:46:15,144 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 16:46:15,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-22 16:46:15,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 16:46:15,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-22 16:46:15,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 16:46:15,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-22 16:46:15,151 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-22 16:46:15,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:15,152 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-22 16:46:15,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 16:46:15,152 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-22 16:46:15,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 16:46:15,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:15,153 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:15,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-08-22 16:46:15,370 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:15,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:15,371 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-22 16:46:15,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:15,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65898516] [2020-08-22 16:46:15,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:15,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:15,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:15,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-22 16:46:15,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:15,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65898516] [2020-08-22 16:46:15,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252860092] [2020-08-22 16:46:15,568 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:15,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-08-22 16:46:15,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:15,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 11 conjunts are in the unsatisfiable core [2020-08-22 16:46:15,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:15,957 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:15,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:15,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2020-08-22 16:46:15,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657833778] [2020-08-22 16:46:15,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 16:46:15,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:15,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 16:46:15,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:46:15,960 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 14 states. [2020-08-22 16:46:16,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:16,064 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-22 16:46:16,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 16:46:16,065 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-22 16:46:16,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:16,066 INFO L225 Difference]: With dead ends: 52 [2020-08-22 16:46:16,067 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 16:46:16,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:46:16,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 16:46:16,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-22 16:46:16,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 16:46:16,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-22 16:46:16,080 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-22 16:46:16,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:16,080 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-22 16:46:16,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 16:46:16,080 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-22 16:46:16,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 16:46:16,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:16,083 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:16,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:16,285 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:16,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:16,286 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-22 16:46:16,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:16,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714987973] [2020-08-22 16:46:16,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:16,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:16,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:16,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:16,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-22 16:46:16,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:16,433 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:16,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714987973] [2020-08-22 16:46:16,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275908153] [2020-08-22 16:46:16,434 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:16,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:46:16,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:16,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 12 conjunts are in the unsatisfiable core [2020-08-22 16:46:16,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:16,527 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:16,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:16,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2020-08-22 16:46:16,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508586292] [2020-08-22 16:46:16,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 16:46:16,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:16,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 16:46:16,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-22 16:46:16,531 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 15 states. [2020-08-22 16:46:16,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:16,627 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-22 16:46:16,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 16:46:16,628 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 38 [2020-08-22 16:46:16,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:16,629 INFO L225 Difference]: With dead ends: 54 [2020-08-22 16:46:16,629 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 16:46:16,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-22 16:46:16,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 16:46:16,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-22 16:46:16,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 16:46:16,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-22 16:46:16,636 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-22 16:46:16,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:16,636 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-22 16:46:16,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 16:46:16,637 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-22 16:46:16,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 16:46:16,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:16,638 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:16,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:16,852 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:16,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:16,853 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-22 16:46:16,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:16,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930117571] [2020-08-22 16:46:16,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:16,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:17,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:17,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:17,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-22 16:46:17,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:17,029 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:17,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930117571] [2020-08-22 16:46:17,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353510608] [2020-08-22 16:46:17,030 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:17,404 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-08-22 16:46:17,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:17,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 13 conjunts are in the unsatisfiable core [2020-08-22 16:46:17,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:17,461 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:17,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:17,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2020-08-22 16:46:17,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54869025] [2020-08-22 16:46:17,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 16:46:17,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:17,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 16:46:17,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-22 16:46:17,464 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 16 states. [2020-08-22 16:46:17,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:17,565 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-22 16:46:17,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 16:46:17,565 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 40 [2020-08-22 16:46:17,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:17,566 INFO L225 Difference]: With dead ends: 56 [2020-08-22 16:46:17,567 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 16:46:17,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-22 16:46:17,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 16:46:17,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-22 16:46:17,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 16:46:17,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-22 16:46:17,573 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-22 16:46:17,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:17,574 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-22 16:46:17,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 16:46:17,574 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-22 16:46:17,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 16:46:17,575 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:17,575 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:17,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-08-22 16:46:17,790 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:17,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:17,791 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-22 16:46:17,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:17,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724283068] [2020-08-22 16:46:17,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:17,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:17,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:17,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:17,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-22 16:46:17,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:17,975 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:17,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724283068] [2020-08-22 16:46:17,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763195457] [2020-08-22 16:46:17,976 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:18,618 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-08-22 16:46:18,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:18,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-08-22 16:46:18,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:18,675 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:18,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:18,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2020-08-22 16:46:18,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55125151] [2020-08-22 16:46:18,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 16:46:18,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:18,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 16:46:18,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-22 16:46:18,678 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 17 states. [2020-08-22 16:46:18,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:18,788 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-22 16:46:18,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 16:46:18,789 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 42 [2020-08-22 16:46:18,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:18,790 INFO L225 Difference]: With dead ends: 58 [2020-08-22 16:46:18,791 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 16:46:18,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-22 16:46:18,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 16:46:18,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-22 16:46:18,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 16:46:18,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-22 16:46:18,798 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-22 16:46:18,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:18,798 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-22 16:46:18,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 16:46:18,799 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-22 16:46:18,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 16:46:18,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:18,800 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:19,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-08-22 16:46:19,010 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:19,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:19,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-22 16:46:19,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:19,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522087820] [2020-08-22 16:46:19,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:19,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:19,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-22 16:46:19,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,185 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:19,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522087820] [2020-08-22 16:46:19,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910948358] [2020-08-22 16:46:19,186 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:19,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2020-08-22 16:46:19,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:19,330 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:19,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:19,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2020-08-22 16:46:19,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157009890] [2020-08-22 16:46:19,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 16:46:19,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:19,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 16:46:19,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-22 16:46:19,334 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 18 states. [2020-08-22 16:46:19,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:19,446 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-22 16:46:19,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 16:46:19,446 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 44 [2020-08-22 16:46:19,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:19,447 INFO L225 Difference]: With dead ends: 60 [2020-08-22 16:46:19,448 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 16:46:19,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-22 16:46:19,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 16:46:19,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-22 16:46:19,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 16:46:19,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-22 16:46:19,462 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-22 16:46:19,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:19,462 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-22 16:46:19,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 16:46:19,463 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-22 16:46:19,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 16:46:19,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:19,465 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:19,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-08-22 16:46:19,680 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:19,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:19,681 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-22 16:46:19,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:19,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896181339] [2020-08-22 16:46:19,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:19,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:19,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-22 16:46:19,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:19,934 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:19,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896181339] [2020-08-22 16:46:19,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241371027] [2020-08-22 16:46:19,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:20,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:46:20,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:20,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 16 conjunts are in the unsatisfiable core [2020-08-22 16:46:20,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:20,045 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:20,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:20,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2020-08-22 16:46:20,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153881925] [2020-08-22 16:46:20,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 16:46:20,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:20,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 16:46:20,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-22 16:46:20,048 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 19 states. [2020-08-22 16:46:20,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:20,158 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-22 16:46:20,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 16:46:20,159 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 46 [2020-08-22 16:46:20,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:20,160 INFO L225 Difference]: With dead ends: 62 [2020-08-22 16:46:20,160 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 16:46:20,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-22 16:46:20,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 16:46:20,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-22 16:46:20,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 16:46:20,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-22 16:46:20,173 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-22 16:46:20,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:20,174 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-22 16:46:20,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 16:46:20,174 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-22 16:46:20,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 16:46:20,175 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:20,175 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:20,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:20,388 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:20,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:20,389 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-22 16:46:20,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:20,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391719797] [2020-08-22 16:46:20,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:20,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:20,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:20,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:20,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-22 16:46:20,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:20,637 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:20,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391719797] [2020-08-22 16:46:20,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290874260] [2020-08-22 16:46:20,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:21,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-08-22 16:46:21,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:21,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 17 conjunts are in the unsatisfiable core [2020-08-22 16:46:21,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:21,172 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:21,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:21,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2020-08-22 16:46:21,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982768747] [2020-08-22 16:46:21,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 16:46:21,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:21,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 16:46:21,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-22 16:46:21,177 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 20 states. [2020-08-22 16:46:21,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:21,297 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-22 16:46:21,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 16:46:21,298 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 48 [2020-08-22 16:46:21,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:21,299 INFO L225 Difference]: With dead ends: 64 [2020-08-22 16:46:21,299 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 16:46:21,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-22 16:46:21,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 16:46:21,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-22 16:46:21,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 16:46:21,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-22 16:46:21,304 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-22 16:46:21,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:21,305 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-22 16:46:21,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 16:46:21,305 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-22 16:46:21,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 16:46:21,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:21,306 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:21,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-08-22 16:46:21,518 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:21,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:21,519 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-22 16:46:21,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:21,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027656949] [2020-08-22 16:46:21,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:21,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:21,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:21,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:21,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-22 16:46:21,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:21,760 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:21,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027656949] [2020-08-22 16:46:21,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251102229] [2020-08-22 16:46:21,761 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:21,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:46:21,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:21,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 18 conjunts are in the unsatisfiable core [2020-08-22 16:46:21,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:21,851 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:21,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:21,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2020-08-22 16:46:21,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944186134] [2020-08-22 16:46:21,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 16:46:21,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:21,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 16:46:21,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-22 16:46:21,853 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 21 states. [2020-08-22 16:46:21,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:21,934 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-22 16:46:21,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 16:46:21,934 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 50 [2020-08-22 16:46:21,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:21,935 INFO L225 Difference]: With dead ends: 66 [2020-08-22 16:46:21,935 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 16:46:21,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-22 16:46:21,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 16:46:21,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-22 16:46:21,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 16:46:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-22 16:46:21,948 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-22 16:46:21,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:21,948 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-22 16:46:21,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 16:46:21,948 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-22 16:46:21,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 16:46:21,949 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:21,949 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:22,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-08-22 16:46:22,154 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:22,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:22,155 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-22 16:46:22,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:22,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653907001] [2020-08-22 16:46:22,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:22,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:22,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:22,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:22,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-22 16:46:22,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:22,389 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:22,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653907001] [2020-08-22 16:46:22,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823911045] [2020-08-22 16:46:22,389 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:24,127 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-08-22 16:46:24,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:24,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 19 conjunts are in the unsatisfiable core [2020-08-22 16:46:24,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:24,168 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:24,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:24,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2020-08-22 16:46:24,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865174381] [2020-08-22 16:46:24,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 16:46:24,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:24,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 16:46:24,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-22 16:46:24,171 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 22 states. [2020-08-22 16:46:24,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:24,248 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-22 16:46:24,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 16:46:24,249 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2020-08-22 16:46:24,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:24,250 INFO L225 Difference]: With dead ends: 68 [2020-08-22 16:46:24,250 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 16:46:24,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-22 16:46:24,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 16:46:24,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-22 16:46:24,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 16:46:24,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-22 16:46:24,255 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-22 16:46:24,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:24,256 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-22 16:46:24,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 16:46:24,256 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-22 16:46:24,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 16:46:24,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:24,257 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:24,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:24,467 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:24,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:24,467 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-22 16:46:24,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:24,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855380881] [2020-08-22 16:46:24,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:24,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:24,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:24,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-22 16:46:24,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:24,770 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:24,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855380881] [2020-08-22 16:46:24,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209372747] [2020-08-22 16:46:24,770 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:28,320 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-08-22 16:46:28,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:46:28,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 20 conjunts are in the unsatisfiable core [2020-08-22 16:46:28,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:28,406 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:28,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:28,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2020-08-22 16:46:28,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467909427] [2020-08-22 16:46:28,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 16:46:28,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:28,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 16:46:28,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-22 16:46:28,413 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2020-08-22 16:46:28,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:28,561 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-22 16:46:28,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 16:46:28,562 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2020-08-22 16:46:28,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:28,563 INFO L225 Difference]: With dead ends: 70 [2020-08-22 16:46:28,564 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 16:46:28,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-22 16:46:28,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 16:46:28,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-22 16:46:28,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 16:46:28,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-22 16:46:28,574 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-22 16:46:28,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:28,575 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-22 16:46:28,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 16:46:28,575 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-22 16:46:28,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 16:46:28,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:28,577 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:28,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:28,778 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:28,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:28,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-22 16:46:28,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:28,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114617513] [2020-08-22 16:46:28,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:28,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:29,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:46:29,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:29,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-22 16:46:29,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:29,120 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:29,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114617513] [2020-08-22 16:46:29,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515387191] [2020-08-22 16:46:29,121 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:29,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:46:29,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 21 conjunts are in the unsatisfiable core [2020-08-22 16:46:29,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:46:29,224 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:46:29,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:46:29,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2020-08-22 16:46:29,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326726083] [2020-08-22 16:46:29,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 16:46:29,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:46:29,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 16:46:29,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-22 16:46:29,227 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 24 states. [2020-08-22 16:46:29,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:46:29,331 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-22 16:46:29,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 16:46:29,332 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 56 [2020-08-22 16:46:29,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:46:29,333 INFO L225 Difference]: With dead ends: 71 [2020-08-22 16:46:29,333 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 16:46:29,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-22 16:46:29,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 16:46:29,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-22 16:46:29,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-22 16:46:29,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-22 16:46:29,338 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-22 16:46:29,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:46:29,338 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-22 16:46:29,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 16:46:29,338 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-22 16:46:29,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-22 16:46:29,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:46:29,339 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:46:29,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:46:29,552 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:46:29,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:46:29,553 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-22 16:46:29,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:46:29,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623199876] [2020-08-22 16:46:29,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:46:29,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:46:29,663 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:46:29,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:46:29,754 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:46:29,791 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:46:29,792 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:46:29,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 16:46:29,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:46:29 BoogieIcfgContainer [2020-08-22 16:46:29,845 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:46:29,848 INFO L168 Benchmark]: Toolchain (without parser) took 20454.16 ms. Allocated memory was 144.7 MB in the beginning and 313.5 MB in the end (delta: 168.8 MB). Free memory was 100.8 MB in the beginning and 88.0 MB in the end (delta: 12.8 MB). Peak memory consumption was 181.6 MB. Max. memory is 7.1 GB. [2020-08-22 16:46:29,849 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 144.7 MB. Free memory was 119.3 MB in the beginning and 118.9 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-08-22 16:46:29,849 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.77 ms. Allocated memory is still 144.7 MB. Free memory was 100.8 MB in the beginning and 90.2 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-08-22 16:46:29,850 INFO L168 Benchmark]: Boogie Preprocessor took 151.18 ms. Allocated memory was 144.7 MB in the beginning and 199.8 MB in the end (delta: 55.1 MB). Free memory was 90.2 MB in the beginning and 177.4 MB in the end (delta: -87.2 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-22 16:46:29,851 INFO L168 Benchmark]: RCFGBuilder took 382.60 ms. Allocated memory is still 199.8 MB. Free memory was 177.4 MB in the beginning and 161.0 MB in the end (delta: 16.4 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. [2020-08-22 16:46:29,851 INFO L168 Benchmark]: TraceAbstraction took 19621.63 ms. Allocated memory was 199.8 MB in the beginning and 313.5 MB in the end (delta: 113.8 MB). Free memory was 161.0 MB in the beginning and 88.0 MB in the end (delta: 73.0 MB). Peak memory consumption was 186.8 MB. Max. memory is 7.1 GB. [2020-08-22 16:46:29,854 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 144.7 MB. Free memory was 119.3 MB in the beginning and 118.9 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.77 ms. Allocated memory is still 144.7 MB. Free memory was 100.8 MB in the beginning and 90.2 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 151.18 ms. Allocated memory was 144.7 MB in the beginning and 199.8 MB in the end (delta: 55.1 MB). Free memory was 90.2 MB in the beginning and 177.4 MB in the end (delta: -87.2 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 382.60 ms. Allocated memory is still 199.8 MB. Free memory was 177.4 MB in the beginning and 161.0 MB in the end (delta: 16.4 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 19621.63 ms. Allocated memory was 199.8 MB in the beginning and 313.5 MB in the end (delta: 113.8 MB). Free memory was 161.0 MB in the beginning and 88.0 MB in the end (delta: 73.0 MB). Peak memory consumption was 186.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 VAL [ad1={2:0}, j=0] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=1] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=2] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=3] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=4] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=5] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=6] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=7] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=8] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=9] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=10] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=11] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=12] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=13] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=14] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=15] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=16] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=17] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=18] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=19] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=20] [L17] COND FALSE !(j<20) VAL [ad1={2:0}, j=20] [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) VAL [\read(*pa)=0, ad1={2:0}, ad2={2:0}, i=10, j=20, pa={2:0}] [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) VAL [\old(b)=10, ad1={2:0}] [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) VAL [ad1={2:0}, ad2={2:0}, check(ad1, i)=0, i=10, j=20, pa={2:0}] [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() VAL [ad1={2:0}, ad2={2:0}, i=10, j=20, pa={2:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 19.4s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 2032 SDs, 0 SdLazy, 1389 SolverSat, 70 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1039 GetRequests, 789 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 7.9s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 1537 NumberOfCodeBlocks, 1537 NumberOfCodeBlocksAsserted, 143 NumberOfCheckSat, 1439 ConstructedInterpolants, 0 QuantifiedInterpolants, 131957 SizeOfPredicates, 19 NumberOfNonLiveVariables, 3097 ConjunctsInSsa, 228 ConjunctsInUnsatCore, 40 InterpolantComputations, 2 PerfectInterpolantSequences, 0/4940 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...